Magnetic Resonance Imaging Manifestations Research Articles

MRI manifestation of xanthomatous hypophysitis: a case report and review of the literature.

The inflammatory lesion of the pituitary gland is unusual. A 33-year-old woman with headache, visual impairment, and menelipsis was admitted to the Second Xiangya Hospital, Central South University. The results of magnetic resonance imaging (MRI) for pituitary gland showed a sellar mass with iso-intensity on T1 weighted imaging and high signal on T2 weighted imaging. The homogeneous lesion was enhanced on contrast MRI. The pituitary stalk was thickened accompanied by the cavernous sinus invasion, which showed a "triangle" saddle occupation on the MRI coronal plane. An endocrinological examination revealed mild hypocortisolism. Th e patient was diagnosed as pituitary adenoma based on the MRI findings and endocrinological examination. Trans-sphenoidal surgery was performed. The intra-operative histological examination also suggested a pituitary adenoma. Th e histopathological examination showed accumulation of foamy cells and xanthomatous epithelioid cells, supporting the diagnosis of xanthomatous hypophysitis. Xanthomatous hypophysitis possesses certain MRI features. Th e most typical imaging features are the thickening of the pituitary stalk and the sign of "triangle" occupation on MRI coronal plane, which are very helpful to the correct diagnosis and optimal management.

AB205. Clinical analysis of the characterization of magnetic resonance imaging and endoscopic therapy in refractory hematospermia

ObjectivesTo assess the etiological diagnostic value of magnetic resonance imaging (MRI) by analysis of the pelvic MRI manifestations or characteristic changes around the ejaculatory duct area and to evaluate the therapeutic effect of transurethral minimally invasive endoscopic treatment in the persistent and refractory hematospermia patients who are ineffective to the conservative treatment.MethodsThe morphological features and characteristic changes around the area of the bilateral seminal vesicles (SV) and ejaculatory duct (ED) in 76 patients with persistent and refractory hematospermia as well as 41 adult males who performed the MRI but did not have urinary reproductive system diseases (as the healthy control group) were retrospectively analyzed. All the 76 patients followed by undergoing transurethral minimally invasive endoscopic examination and treatment based on the MRI imaging characteristic. The therapeutic effect was followed up, analyzed and summarized.ResultsBased on the analysis to the normal morphological features of the bilateral SVs and ED areas of pelvic MRI images in 41 cases of health adult men, it was found that 88.2% (67/76) patients with persistent and refractory hematospermia showed typical and characteristic changes in the ED and SVs area in MRI imaging. The main characteristic changes are: (I) 61.8% (47/76) patients showed the signal intensity changes in seminal vesicle, in which 24 patients with old hemorrhage showed middle to high signal intensity on both T1-weighted images (T1WI) and T2-weighted images (T2WI), while the other 23 patients with fresh hemorrhage showed high signal intensity on T1WI)and low signal intensity on T2WI; (II) 34.2% (26/76) patients showed significant cystic dilatation (the width of SV is bigger than 1.7 cm or the diameter of the inner tubular structure is bigger than 5 mm) in unilateral or bilateral SV, with or without the internal signal intensity changes; (III) 36.8% (28/76) patients showed the formation of cysts in the ejaculatory area such as prostatic utricular cysts (PUC) in 27.6% (21/76) patients, Müllerian duct cysts (MDC) in 3.9% (3/76) patients, Ejaculatory duct cysts (EDC) in 3.9% (3/76) patients, and an Seminal vesicle cyst (SVC) in 1.3% (1/76) patients. 11.8% (9/76) patients did not show any obvious abnormal changes in MRI imaging. All the patients were successfully performed observation, dilation, incision or irrigation to their ejaculatory duct and related area under the transurethral endoscopy. No obvious complications were found during and after the surgeries. The biopsies were performed in some of the patients and the pathology confirmed that all the tissue from SV only have non-specific chronic inflammation. No tumor was found in the area of prostate, ED and SV. All the patients were followed-up for 3-36 months (average 18 months). The hematospermia and their related symptoms in most of all of them were disappeared after surgery, except for two patients experienced a recurrence of hematospermia after 5 and 11 months of surgery. The two patients underwent the same treatment again as described above, and recovered during the followed-up period. The urination and ejaculation are usually as well as before surgery. Only two old patients complained about that the orgasm and pleasant sensation slightly decreased, the other 97.4% (74/76) patients have normal orgasm and pleasant sensation after surgery.ConclusionsThe etiology of the most cases of the refractory hematospermia can be distinguished using the three-dimensional MRI imaging. Typical abnormalities observed on MR images are signal intensity, SV volume changes and cyst formation. MRI has significant etiological diagnostic value and provides reliable information for the subsequent treatment of patients with persistent and refractory hematospermia. The transurethral endoscopic technique such as the dilatation of the ED, incision of the verumontanum or distal ejaculatory duct, incision or excision of the cyst in this region is a simple, safe, reliable and effective treatment method for the patients with persistent and refractory hematospermia.

Subjective cognitive failures in patients with hypertension are related to cognitive performance and cerebral microbleeds.

Previous studies on the relationship between subjective cognitive failures (SCF) and objective cognitive function have shown inconsistent results. In addition, research on the association between SCF and imaging markers of cerebral small vessel disease is limited. We investigated whether SCF in patients with essential hypertension, who are at high risk of cerebral small vessel disease, are associated with objective cognitive function and magnetic resonance imaging manifestations of cerebral small vessel disease. We included 109 patients with hypertension who underwent extensive neuropsychological assessment, including questionnaires measuring SCF and symptoms of anxiety and depression. Brain magnetic resonance imaging was performed to rate the presence of lacunes, cerebral microbleeds, and perivascular spaces, as well as white matter hyperintensities volume. Results showed significant associations between SCF and objectively measured overall cognition (B=-0.02; 95% confidence interval=-0.03 to -0.005), memory (B=0.02; 95% confidence interval=-0.03 to -0.004), and information processing speed (B=-0.02; 95% confidence interval=-0.03 to -0.001) after adjustment for patient characteristics and vascular risk factors. In addition, SCF were associated with the presence of cerebral microbleeds (odds ratio=1.12; 95% confidence interval=1.02-1.23) after adjustment for patient characteristics and vascular risk factors but not with other imaging markers of cerebral small vessel disease. Our study demonstrates that attention for SCF in patients with hypertension is needed because these may point to lower objective cognitive function, which might be as a result of the presence of cerebral microbleeds. Accordingly, this study emphasizes that neuropsychological assessment and brain imaging need to be considered when patients with hypertension report SCF.

Diagnostic value of MRI for spontaneous intracranial hypotension syndrome

Objective To analyze the magnetic resonance imaging （ MRI ） appearances of spontaneous intracranial hypotension syndrome （ SIHS） ,in order to improve the understanding of this disease .Methods The clini-cal data of 7 patients with SIHS confirmed by lumbar puncture were retrospectively analyzed .MRI was performed in all cases,in which there were 6 cases with contrast-enhanced MRI.Results All of them showed diffusely thickening of dural.6 cases with brain contrast-enhanced MRI demonstrated linear ,non-nodular and diffusely dural enhancement . The dilation of sinus and great vein were observed in 5 cases,subdural hydroma in 2 cases,brain sagging in 3 cases, pituitary gland plumpness in 2 cases,subdural hematoma in 1 case and 1 case with linear spinal dural enhancement . Conclusion The MRI manifestations of SIHS are characteristic ,and it will be helpful for the diagnosis by combining clinical data. Key words: Intracranial hypotension; Syndrome; Magnetic resonance imaging; Diagnosis

Value of magnetic resonance imaging for early diagnosis of prostatic carcinoma in central zone

To explore the magnetic resonance imaging (MRI) manifestations of early prostatic carcinoma (PCa) in central zone (CZ) . A total of 284 cases of PCa were scanned by MRI while 24 cases of carcinoma in 28 PCa focus were in central zone. Their T1WI, T2WI, DWI and ADC value characteristics were analyzed respectively and the completeness of annular low signal between central and peripheral zones were observed. At the same time, 45 cases of PCa were located in peripheral zone (PZ) . Twenty cases of benign prostatic hyperplasia (BPH) were comparatively analyzed. All cases received a histological diagnosis. Most cases of early PCa in CZ demonstrated ill-defined margin, amorphous shape and equal signal intensity on T1WI, low signal intensity on T2WI and high signal intensity on DWI. The mean ADC value for PCa focus was (0.867 ± 0.074)×10(-3) mm(2)/s and PCa foci were enhanced slightly. In these cases, most annular low signals between CZ and PZ were destroyed. The difference of ADC values between PCa in CZ and PZ groups ((0.914 ± 0.066) ×10(-3) mm(2)/s ) had no statistic significance (P > 0.05) , but the ADC values between PCa and BPH in CZ groups ((1.517 ± 0.315) ×10(-3) mm(2)/s ) had statistically significant difference (P < 0.05). Some reliable diagnostic characteristics on MRI may be used for an early diagnosis of PCa in CZ.

Herlyn-Werner-Wunderlich Syndrome: Merits of Sonographic and Magnetic Resonance Imaging for Accurate Diagnosis and Patient Management in 13 Cases

Study ObjectiveTo review the main sonographic and magnetic resonance imaging manifestations of Herlyn-Werner-Wunderlich syndrome, characterized by uterus didelphys, obstructed hemivagina, and ipsilateral renal agenesis, and to discuss the value of techniques for its diagnosis and treatment. ParticipantsThirteen patients with Herlyn-Werner-Wunderlich syndrome referred to our department with acute abdomen were identified for the period from 2009-2012. DesignRetrospective chart review. SettingTwo tertiary academic centers. InterventionsNone. Main Outcome MeasuresThe evaluation of the clinical features, ultrasonography and magnetic resonance imaging findings, and the treatment protocols. ResultsUltrasonographic evaluation of didelphic or double uterus in 10 and bicornuate-bicollis uterus in 3 patients with hematocolpos or hematometrocolpos associated with agenesis of the ipsilateral kidney revealed the diagnosis. In 10 patients, magnetic resonance imaging provided extra information. In 1 patient, a 25-week pregnancy was additionally detected and follow-up was suggested. Seven patients underwent surgical excision of the septum and drainage of the obstructed vagina. Total hysterectomy and hemicolpectomy were performed in 1 patient with 2 children suffering from severe chronic pelvic pain due to pelvic inflammatory disease. ConclusionsDespite its rarity, accurate diagnosis and morphologic description of Herlyn-Werner-Wunderlich syndrome with radiologic modalities are of importance in relieving the clinical complaints by enabling the suitable surgical treatment to be identified.

Ectopic pancreas in the anterior mediastinum: A report of two cases and review of the literature

Ectopia of the pancreatic tissue is a developmental anomaly found in ~2% of all autopsies, and 70~90% of these anomalies are located in the gastrointestinal tract. Mediastinal localization of an ectopic pancreas is extremely rare. Herein, we report two cases with mediastinal ectopic pancreas clarified by pathology and shown by thoracic contrast-enhanced computed tomography (CT) and magnetic resonance imaging (MRI). In addition, a brief review of the relevant literatures is presented. Although CT and MRI manifestations of this lesion are nonspecific, certain notable findings need to be focused on. When there is a mass in the anterior mediastinum with marked and heterogeneous enhancement, along with necrotic and liquefied non-enhanced areas in the center, ectopic pancreas should be considered and differentiated from other neoplasms in this region.

MRI diagnosis of intradural extramedullary tumors.

This study evaluates the magnetic resonance imaging (MRI) manifestation of intradural extramedullary (IDEM) tumors to improve the imaging diagnostic level. From January 2005 to December 2012, a retrospective analysis of the MRI examination was performed on 108 patients with IDEM tumors confirmed by surgical pathology postoperatively in our hospital. According to the pathological classification; the gender, age, location, size, foraminal state extension, signal intensity (compared with the spinal cord), and enhancement were recorded and statistically analyzed. A total of 108 cases (111 lesions) were reported; 69 (70 lesions), 31 (31 lesions), three (five lesions), four (four lesions), and one (one lesion) of which were schwannoma, meningioma, neurofibroma, teratoma, and metastatic tumor, respectively. MRI manifestations of different IDEM tumors have certain specificities. MRI is the preferred examination method for to diagnose IDEM tumors and provide a reliable imaging basis for clinical treatment and prognosis judgment.

Unusual natalizumab-associated progressive multifocal leukoencephalopathy starting in the brainstem

we report on a 45-year-old German patient with relapsingremitting (RR) multiple sclerosis (MS) who was started on natalizumab (NAT) therapy in November 2007, because of ongoing disease activity despite interferon therapy. She had never been treated with immunosuppressants before. After she tested positive for anti-JCV (John Cunningham Virus)antibodies for the first time, she decided to discontinue NAT treatment in July 2011 (after 49 NAT infusions). At this time point, as well as during NAT therapy, she was clinically stable (EDSS 3.5). Six weeks later in August 2011, she developed new brainstem symptoms, with left facial and trigeminal nerve palsy, double vision and mild dysphagia. On magnetic resonance imaging (MRI), a large brainstem-midbrain lesion was seen (Fig. 1D). The symptoms were initially interpreted as MS relapse and treated with corticosteroids. After transient improvement, she deteriorated again and was seen for the first time at our hospital. Progressive multifocal leukoencephalopathy (PML) was diagnosed in September 2011 after detection of JCV DNA (31 c/ml in CSF, 5 c/ml in serum; EDSS 7.0). Subsequently, she developed severe immune reconstitution inflammatory syndrome (IRIS), deteriorated clinically (EDSS 9.5), and had to be transferred to the intensive care unit (ICU) for several weeks. Finally, she stabilized after repeated courses of high-dose iv glucocorticosteroids (GC) and iv immunoglobulins (IVIgG, 5 days a 0.4 g/kg body weight), as well as concomitant therapy with mefloquine and mirtazapine. Six months later, she had improved, but still showed severe ataxia and brainstem symptoms (EDSS 6.0). Retrospective analysis of all available MRI scans identified a small new-initially asymptomatic-T2 brainstem lesion as the first MRI manifestation of this patient’s PML in November 2010, which slowly progressed over 41 weeks until clinical PML presentation (Fig. 1A–D). Several aspects in this report are unusual: (1) brainstem PML is rare and has been reported in association with NAT therapy in MS patients only once so far [1]; (2) the longlasting pre-symptomatic phase of 41 weeks and clinical manifestation of PML only 6 weeks after NAT was discontinued; and (3) clinical improvement after combined therapy with GC and IVIgG. In this patient, a new, asymptomatic, non-contrast-enhancing T2 lesion appeared in the brainstem in November 2010 (Fig. 1B). Notably, before the MRI lesion was rated as important, the patient decided to stop NAT therapy in July 2011 due to fear of PML. At this time and during NAT treatment, the lesion was completely asymptomatic. The patient developed new brainstem symptoms only 6 weeks after discontinuation of NAT and showed a large brainstem-midbrain lesion on MRI at that time. Detailed retrospective MRI analysis identified that this large lesion had progressed over time from the small brainstem lesion 41 weeks before. NATassociated PML with a pre-symptomatic course up to 24 weeks has been reported, but not in the brainstem so far [2]. More recently, Yousry and colleagues [3] identified common MRI patterns of NAT-associated PML, which help in the early diagnosis of PML. Except for the unusual initial localization in the brainstem and size (\ 3 cm), all J. Havla (&) R. Hohlfeld T. Kumpfel Institute of Clinical Neuroimmunology, Ludwig-Maximilians-University, Medical Campus Grosshadern, Marchioninistr. 15, 81377 Munich, Germany e-mail: joachim.havla@med.lmu.de

Clinical Manifestations and Spinal Cord Magnetic Resonance Imaging Findings in Chinese Neuromyelitis Optica Patients

Neuromyelitis optica (NMO) is a disease distinct from multiple sclerosis in terms of clinical and magnetic resonance imaging (MRI) manifestations. Antibody to aquaporin-4 (AQP4) has been identified as a specific biomarker and part of the diagnostic criteria for NMO. Although it is relatively common in Asia, a comprehensive clinical and imaging evaluation of NMO has not been reported in Chinese patients. Here, we reviewed data from 57 Chinese cases. The patients had an obvious female preponderance (female/male = 8.5:1), and transverse myelitis (82.5%) and optic neuritis (56.1%) were the most common manifestations. In MRI, longitudinally extensive transverse myelitis (6.9 ± 2.3 segments) dominated the spinal cord lesions, which were mainly (69.7%) distributed in cervical and thoracic cord. However, the length of the lesions was not correlated with onset age, paralysis severity, relapse rate, or duration. Among 29 patients who underwent AQP4 antibody assay, 17 (58.6%) were positive. There was no difference between seropositive and seronegative patients in terms of female preponderance, onset age, relapse rate, and Expanded Disability Status Scale score. However, seropositive patients had significantly more damaged segments (8.3 ± 3.5) than did seronegative patients (4.5 ± 1.6) (p < 0.001). The data revealed the clinical and MRI characteristics and AQP4 antibody status of NMO in Chinese patients and the correlations between them, which may have important implications for the diagnosis of the disease.

Intramedullary gangliogliomas: clinical features, surgical outcomes, and neuropathic scoliosis

Intramedullary spinal cord gangliogliomas are rare tumors composed of glial components and ganglion cells. These gangliogliomas are generally considered as slow-growing tumors, corresponding histologically to WHO grade I or II. There are few reports of large case series of intramedullary spinal cord gangliogliomas from a single center. We retrospectively reviewed a consecutive series of 18 patients with pathologically diagnosed ganglioglioma. Clinical manifestations, radiological features, treatment and follow-up data, and concomitant scoliosis were investigated. The mean age at diagnosis was 27.5years, with a slight female predominance. The primary clinical symptoms were sensorimotor deficits. Magnetic resonance (MR) imaging manifestations varied considerably. Some associated, but not necessary, features were found, such as young age at onset, large tumor dimension, and bony changes. Scoliosis was observed in seven patients. Remnant tumor progression was observed in five patients during the follow-up period, and no deaths occurred. The last neurological evaluation showed functional improvement from preoperative status in five patients. Differential diagnosis of ganglioglioma based on MR images alone is challenging, but the combination of some characteristic features can be helpful. An accurate diagnosis of ganglioglioma depends on pathological criteria. Despite the benign course of ganglioglioma, considerable growth may affect its resectability and prognosis. The extent of resection should be meticulously planned, and the potential risk of recurrence and neurological deterioration should be evaluated. The concomitant scoliosis is noteworthy.

MRI manifestations of liver epithelioid and nonepithelioid angiomyolipoma

To retrospectively analyze the magnetic resonance imaging (MRI) manifestations of liver AML and compare the MRI manifestations of epithelioid and nonepithelioid angiomyolipoma (AML). The study comprised a retrospective analysis of 11 patients whose hepatic AML was confirmed by surgical pathology. Routine MRI examination was performed in 11 patients, of which five were cases of epithelioid AML and six were cases of nonepithelioid AML. One case of nonepithelioid AML underwent a plain MRI scan only, while the remaining 10 patients underwent MRI and dynamic contrast-enhanced scans. Chemical shift imaging detected more fat component cases than frequency the saturation method did (7/11 vs. 3/11). The difference was not statistically significant, however (P = 0.236). The degree of fatty component was different between epithelioid and nonepithelioid AML, but there was no significant difference between them (P = 0.766). Of the 10 cases in which enhancement scans were performed, nine had hyperenhancement in the arterial phase, and nine had capsule enhancement on delayed phase. The amount of fat content is not related to whether the tumor is epithelioid or nonepithelioid. Under dynamic contrast-enhancement MRI, epithelioid AML shows enhancement patterns similar to those of classic AML rich in vascular smooth muscles.

Imaging and clinical properties of inflammatory demyelinating pseudotumor in the spinal cord.

Inflammatory demyelinating pseudotumor usually occurs in the brain and rarely occurs in the spinal cord. On imaging, inflammatory demyelinating pseudotumor appears very similar to intramedullary tumors such as gliomas. It is often misdiagnosed as intramedullary tumor and surgically resected. In view of this, the clinical and magnetic resonance imaging manifestations and the pathological fea-tures of 36 cases of inflammatory demyelinating pseudotumor in the spinal cord were retrospec-tively analyzed and summarized. Most of these cases suffered from acute or subacute onset and exhibited a sensorimotor disorder. Among them, six cases were misdiagnosed as having intra-dullary gliomas, and inflammatory demyelinating pseudotumor was only identified and pathologi-cally confirmed after surgical resection. Lesions in the cervical and thoracic spinal cord were com-mon. Magnetic resonance imaging revealed edema and space-occupying lesions to varying grees at the cervical-thoracic junction, with a predominant feature of non-closed rosette-like forcement (open-loop sign). Pathological examination showed perivascular cuffing of predominantly dense lymphocytes, and demyelination was observed in six of the misdiagnosed cases. These re-sults suggest that tumor-like inflammatory demyelinating disease in the spinal cord is a kind of special demyelinating disease that can be categorized as inflammatory pseudotumor. These solitary lesions are easily confused with intramedullary neoplasms. Patchy or non-closed reinforcement (open-ring sign) on magnetic resonance imaging is the predominant property of inflammatory myelinating pseudotumor, and inflammatory cell infiltration and demyelination are additional pa-logical properties.

Spinal Magnetic Resonance Imaging Manifestations at Neurological Onset in Japanese Patients with Spinal Cord Sarcoidosis

We retrospectively investigated spinal magnetic resonance imaging (MRI) manifestations at neurological onset in Japanese patients with spinal cord sarcoidosis. Between July 2000 and April 2012, we reviewed our database and recruited patients with spinal cord sarcoidosis. On spinal MRI performed at neurological onset, the following items were evaluated: the vertebral-segment distribution and length of intramedullay T2-elongated lesions, abnormal enhancement patterns and distributions and the concomitant presence of spondylosis and associated extraspinal lesions. If available, brain MRI scans were concomitantly assessed. Nine patients were enrolled (four men and five women; median, 49 years). Reflecting Japanese epidemiological backgrounds, a predilection for occurrence was observed in young men and middle-aged women. Intramedullary T2-elongated lesions were present in eight patients, peaking at the C5 level, with a mean length of 3.7 ± 2.6 vertebral segments. Spondylosis coexisted in the middle-aged patients. Abnormal intramedullary enhancement with concomitantly involved the nerve roots was observed in six patients, comprised of two types reflecting the disease progression: linear- and/or nodular enhancement along the surface of the spinal cord and intramedullary enhancement consisting of patchy, broad-based enhancement adjacent to the cord surface. Five patients had associated extraspinal lesions, including lymphadenopathy in four patients and brain involvement in four patients. Spinal cord sarcoidosis exhibits a predilection for young men and middle-aged women among Japanese individuals and is characterized by intramedullary T2-elongated lesions spreading more than three vertebral segments peaking at the C5 level, two types of abnormal intramedullary enhancement reflecting disease progression, frequent nerve root involvement and lymphadenopathy.

Rectal gastrointestinal stromal tumors: Imaging features with clinical and pathological correlation

To investigate computed tomography (CT) and magnetic resonance imaging (MRI) manifestations of rectal gastrointestinal stromal tumors (GISTs) in order to enhance the recognition of these rare tumors. Fourteen patients with pathologically proven rectal GISTs were retrospectively reviewed. Patient histories were retrospectively reviewed for patient age, gender, presenting symptoms, endoscopic investigations, operation notes and pathologic slides. All tumors were evaluated for CD117, CD34 expression, and the tumors were stratified according to current criteria of the National Institutes of Health (NIH). In all cases the first pre-operation imaging findings (CT and MRI, n = 3; MRI only, n = 8; CT only, n = 3) were analyzed by two experienced radiologists by consensus, which include: tumor size, shape, CT density (hypodense, isodense and hyperdense), MRI signal intensity (hypointense, isointense and hyperintense), epicenter (intraluminal or extraluminal), margin (well-defined or ill-defined), internal component (presence of calcifications, necrosis, hemorrhage or ulceration), pattern and degree of enhancement, invasion into adjacent structures. After review of the radiologic studies, clinical and pathological findings were correlated with radiological findings. The patients, 13 men and 1 woman, were aged 31-62 years (mean = 51.5 ± 10.7 years). The most common initial presentation was hematochezia (n = 6). The mean tumor diameter was 5.68 ± 2.64 cm (range 1.5-11.2 cm). Eight lesions were round or oval, and 6 lesions were irregular. Eleven lesions were well-defined and 3 had ill-defined margins. Ten tumors were extraluminal and 4 were intraluminal. The density and MR signal intensity of the solid component of the lesions were similar to that of muscle on unenhanced CT (n = 6) and T1-weighted images (n = 11), and hyperintense on T2-weighted MR images. Calcification was detected in 2 tumors. Following intravenous injection of contrast media, 3 lesions had mild enhancement and 11 lesions had moderate enhancement. Enhancement was homogenous in 3 lesions and heterogeneous in 11. In 1 of 11 patients who underwent both CT and MRI, the tumor was homogenous on CT scan and heterogeneous on MRI. Eight patients were classified as high risk according to the modified recurrent risk classification system of NIH. Rectal GISTs usually manifest as large, well-circumscribed, exophytic masses with moderate and heterogeneous enhancement on CT and MRI. The invasion of adjacent organs, bowel obstruction and local adenopathy are uncommon.

Early imaging characteristics of 62 cases of cerebral venous sinus thrombosis

This study aimed to evaluate the early imaging characteristics of cerebral venous sinus thrombosis (CVST). A retrospective analysis was conducted of the clinical and imaging data of 62 patients with CVST diagnosed by magnetic resonance imaging (MRI) and/or digital subtraction angiography (DSA). In the 62 cases, MRI (1.5 T MRI) and magnetic resonance venography (MRV) examinations were conducted for 56 cases, and 54 of these were definitely diagnosed as CVST cases. Their MRI manifestations presented punctiform and sheet-like hemorrhagic cerebral infarction and extensive brain edema while partial cases presented cerebral ventricle dilation. In addition, MRI, MRV and DSA examinations were conducted synchronously for 2l cases. Among the 20 patients whose MRI and MRV examinations were positive, 19 cases were positive by DSA examination and the coincidence rate of the two was 95.00%. The clinical manifestations of CVST lack specificity. MRI combined with MRV examination is the preferred method of diagnosing CVST.

IgG4-related Disease of the Head and Neck: CT and MR Imaging Manifestations

Immunoglobulin G4 (IgG4)-related disease is a recently established systemic disease that commonly involves the head and neck, including the salivary glands, lacrimal glands, orbits, thyroid gland, lymph nodes, sinonasal cavities, pituitary gland, and larynx. Although the definitive diagnosis of IgG4-related disease requires histopathologic analysis, elevated serum IgG4 levels are helpful in making the diagnosis. Because of the proposed clinical diagnostic criteria for this disease, cross-sectional imaging modalities such as computed tomography (CT) and magnetic resonance (MR) imaging play an important diagnostic role. CT and MR imaging findings of IgG4-related disease are usually nonspecific. At CT, involved organs may demonstrate enlargement or decreased attenuation; at T2-weighted MR imaging, they may have relatively low signal intensity owing to their increased cellularity and amount of fibrosis. Some pathologic entities involving the head and neck are now considered to be part of the IgG4-related disease spectrum, including idiopathic orbital inflammatory syndrome (inflammatory pseudotumor), orbital lymphoid hyperplasia, Mikulicz disease, Küttner tumor, Hashimoto thyroiditis, Riedel thyroiditis, and pituitary hypophysitis. Because involvement of multiple sites is common in IgG4-related disease, radiologists should be familiar with manifestations of this systemic process outside the head and neck, in organs such as the pancreas, bile ducts, gallbladder, kidneys, retroperitoneum, mesentery, lungs, gastrointestinal tract, and blood vessels. Moreover, IgG4-related disease usually demonstrates a dramatic response to corticosteroid therapy, and radiologists should be familiar with its clinical and imaging manifestations to avoid a delay in diagnosis or unnecessary invasive interventions.

Neurologic complications in children with enterovirus 71-infected hand-foot-mouth disease : clinical features, MRI findings and follow-up study

To explore the clinical and magnetic resonance imaging (MRI) characteristics and the follow-up outcomes of neurologic complications in children with enterovirus 71-infected hand-foot-mouth disease. The clinical and MRI manifestations and follow-up outcomes in 35 children, at Second Affiliated Hospital, Wenzhou Medical College from August 2008 to November 2010, hospitalized with neurologic complications of enterovirus 71-infected hand-foot-mouth disease were retrospectively analyzed. Six children with aseptic meningitis presented the clinical symptoms and signs of meningitis. Five of them showed subdural effusion and ventriculomegaly, or both on MRI. At follow-ups, neurologic sequel could not be found. Among 24 cases with brainstem encephalitis, there were myoclonic jerks and tremor, ataxia, or both (grade I disease, n = 12), myoclonus and cranial-nerve involvement (grade II disease, n = 4), and cardiopulmonary failure after brain-stem infection (grade III disease, n = 8). In patients with brainstem encephalitis, lesions were predominantly located at the posterior portions of medulla and pons with hypointensity on T1WI and hyperintensity on T2WI. Cerebellar dentate nucleus, caudate nucleus and lenticular nucleus could also be involved. At follow-ups, the patients with mild symptoms had no neurologic sequel and the lesions within brain stem became small or vanished in most cases. While in the majority of serious patients, neurologic sequel could be found and the lesions located at brain stem became encephalomalacia. Fourteen cases with acute flaccid paralysis presented acute limb myasthenia with tendon reflex and muscular tension decreased. On spinal MRI, the lesions predominantly involved anterior horn regions of spinal cord with hypointensity on T1WI and hyperintensity on T2WI. Most patients improved their muscle strength and most lesions of spinal cord became smaller or vanished during follow-ups. MRI is the most effective modality of diagnosis and follow-up for neurologic complications in children with enterovirus 71-infected hand-foot-mouth disease. On MRI, the lesions mainly involve the anterior horn of spinal cord, medulla oblongata and pons. At follow-ups, most patients have no neurologic sequel and the visualized lesions will be absorbed after active treatment.

Malignant peripheral nerve sheath tumor in spine: imaging manifestations

Malignant peripheral nerve sheath tumor (MPNST) is a relatively rare soft tissue malignant tumor. Most of reports currently are pathological articles and clinical case reports and most of them are MPNST in the thorax, abdomen or extremities. Imaging report of spinal MPNST is very rare, and MPNST is easy to be misdiagnosed. In this study, we explored the computed tomography and magnetic resonance imaging manifestations of MPNST that occurred in the spine and to improve the preoperative diagnostic accuracy of MPNST.

Cerebral Microbleeds and Long-Term Cognitive Outcome: Longitudinal Cohort Study of Stroke Clinic Patients

Background: Vascular cognitive impairment causes significant disability in the elderly and is common following ischaemic stroke. Although the underlying mechanisms and prognostic factors remain unclear, small vessel diseases are known to contribute. Cerebral microbleeds (CMBs) are a magnetic resonance imaging (MRI) manifestation of small vessel diseases and may contribute to vascular cognitive impairment, particularly frontal-executive functions. We hypothesized that baseline CMBs would predict long-term cognitive outcome, specifically frontal-executive function. Methods: A cohort of consecutive patients found to have CMBs when first referred to a stroke clinic, together with a CMB-free control group matched for age, gender and clinicoradiological characteristics, were invited for follow-up cognitive assessment a median of 5.7 years later. MRI and detailed cognitive assessment (including current intellectual function, verbal memory, visual memory, naming skills, perceptual functions, frontal-executive functions; and speed and attention) were performed at baseline and follow-up. Patients were classified (blinded to MRI and clinical data) as impaired or unimpaired in each domain using predefined criteria. We compared the prevalence of cognitive impairments in each domain at baseline and follow-up and investigated clinical and radiological predictors [including baseline CMBs and white matter changes (WMCs)] of frontal-executive cognitive impairment. Results: Of the original cohort of 55 patients, 13 died without follow-up. Twenty-six of the surviving patients (9 with, 17 without baseline CMBs) agreed to follow-up neuropsychological assessment; 21 of these patients had a repeat MRI scan. The median number of cognitive domains impaired increased, regardless of the presence of baseline CMBs (with baseline CMBs: median 3, range 0–5 at follow-up vs. median 2, range 0–2 at baseline, p = 0.016; without CMBs: median 1.0, range 0–5 at follow-up vs. median 0, range 0–5 at baseline, p = 0.035). Frontal-executive impairment at follow-up was more prevalent in patients with baseline CMBs than in those without (78 vs. 29%, p = 0.038). The presence of baseline CMBs predicted frontal-executive impairment at follow-up (OR 8.40, 95% CI 1.27–55.39, p = 0.027). Fifty percent of patients with CMBs versus 8% of patients without baseline CMBs developed new CMBs (p = 0.047). The severity of WMCs increased; the difference was statistically significant only in patients without baseline CMBs (p = 0.027). There were no new cortical infarcts. Conclusion: In stroke clinic patients, CMBs are consistently associated with frontal-executive impairment; baseline CMBs are associated with frontal-executive impairment at follow-up after 5.7 years. The presence of CMBs has prognostic relevance for long-term cognitive outcome in stroke clinic patients, and may help to optimally target preventive strategies in individuals at highest risk of cognitive decline.