Ring-enhancing Lesions Research Articles

Giant cerebellar neurocysticercosis masquerading a primary central nervous system neoplasm – A case report with review of literature

Background: Neurocysticercosis (NCC) is one of the leading parasitic infections of the brain. Giant NCC is rare, with only two cases of cerebellar involvement reported till now. In the presence of a host immune response, these giant NCCs can mimic primary central nervous system neoplasms. The objective of this article is to report a rare case of giant cerebellar NCC and its management strategy with a literature review. Case Description: A young male presented with a giant cerebellar ring-enhancing mass with features of raised intracranial pressure, and surgical excision was done. The patient made an uneventful recovery. Conclusion: Surgical excision is safe for NCC, especially in the presence of a diagnostic dilemma.

ANGI-07. A CASE OF HYPERBARIC OXYGEN USED AS A TREATMENT MODALITY FOR ANAPLASTIC ASTROCYTOMA

Abstract Although its precise mechanism is unclear, hyperbaric oxygen is thought to impede the growth of tumor cells by inhibiting tumor hypoxia, a known driver for angiogenesis. We present a case of a 32-year-old pilot who developed sudden onset aphasia and disorientation which led to hospitalization and imaging. He was diagnosed with anaplastic astrocytoma and underwent resection, radiation, and chemotherapy with temozolomide. Approximately one year later, MRI showed enlarging non-enhancing T2/FLAIR hyperintense mass in the right temporal lobe. He received 4 cycles of lomustine. Four months later, MRI showed slight increase in the size of ring enhancement around the treatment area. These findings were thought to be related to treatment-related changes. After 4 doses of bevacizumab every 2 weeks, there was improvement in surrounding vasogenic edema. However, after 7 doses, his MRI brain demonstrated increase in treatment-related changes with more vasogenic edema. He also had worsening left-sided weakness, unable to lift his left arm against gravity, dysarthria, and cognitive slowing. MRI perfusion supported treatment-related changes rather than tumor growth. He then started hyperbaric oxygen treatments and after 20 sessions of treatment, his vasogenic edema and his left-sided weakness improved. After 60 sessions of hyperbaric oxygen, he noticed further improvement in his strength and short-term memory. Four months after completion of his hyperbaric oxygen, he was found to have increasing size of ring-enhancing lesion and was restarted on hyperbaric oxygen treatments in addition to bevacizumab and low-dose temozolomide. He completed a total of 100 rounds of hyperbaric treatments. MRI showed improvement and stability. His left-sided weakness continued to improve. Hyperbaric oxygen alone or combined with other treatment modalities may be a promising therapy to improve quality of life. Further research will assist with mechanisms through which hyperbaric oxygen works and patient outcomes.

Ring-Enhancing Lesions-Differentiation with MRI.

Lesions with central hypointensity and peripheral contrast enhancement are defined as ring-enhancing lesions. The aetiologies of ring-enhancing lesions may be various, including infections, tumours, demyelinating diseases, treatment-related conditions and hematoma. The imaging findings and their distinguishing features also vary among different ring-enhancing lesions. This review examines the magnetic resonance imaging findings of different ring-enhancing lesions and their distinguishing features.

A Report of a Rare Case of a Solitary Ring-Enhancing Lesion in a Patient With Positive Toxoplasma Serology

A Report of a Rare Case of a Solitary Ring-Enhancing Lesion in a Patient With Positive Toxoplasma Serology

Fungal Intracranial Infections (Central Nervous System-Invasive Fungal Disease) in Patients With Haematological Disorders-A Single-Centre Retrospective Study.

Invasive fungal disease (IFD) is a sinister complication encountered in patients with haematological disorders. When occurring in the central nervous system (CNS), IFDs can have catastrophic outcomes. To study the clinical presentation, predisposing etiological factors, and prognosis of a CNS-IFD in a patient with a haematological disorder. This is a retrospective study focusing on the clinical profile, diagnosis, treatment strategy and outcomes of 43 patients with an underlying haematological disorder, who were diagnosed with CNS-IFD between 2018 and 2022. Of the 43 patients, 18 were chemotherapy recipients, while 23 were stem cell transplant (SCT) recipients and 2 presented with CNS-IFD at diagnosis. AML/MDS (37.2%) and ALL (18.6%) were the predominant underlying diagnoses. A sudden deterioration in sensorium (53.5%) was the earliest clinical sign, while T2 hyperintensities (26.8%), vascular involvement (26.8%) and ring-enhancing lesions (16.3%) were the commonest radiological findings, with all patients exhibiting diffusion restriction in diffusion-weighted images. Microbiological evidence of infection was obtained in all patients; however, culture positivity was established in only 25 patients. Rhizopus spp (23.2%) and Aspergillus spp (20.9%) were implicated in most cases. Overall survival of the cohort was 27.9% at a median follow-up of 6 months. In patients who succumbed, the median time to death was 4 days (0-46). CNS-IFD is associated with very poor survival in patients undergoing chemotherapy or an SCT, urging the need for prompt diagnosis and initiation of suitable antifungal therapy.

The Evolution of a Ring-Enhancing Lesion

We report a case of probable neurocysticercosis in a 30-year-old non-Hispanic Caucasian patient without international travel history who presented with breakthrough seizures and a ring-enhancing lesion with perilesional edema. He first developed seizures two years prior, and his workup then demonstrated a single ring-enhancing lesion that was initially attributed to head trauma. On his presentation for breakthrough seizures, his ring-enhancing lesion demonstrated new perilesional edema, and on repeat imaging one month later, near resolution of the cystic lesion. His serum and cerebrospinal fluid serologies for Taenia solium were negative. Of note, the patient reports a friend who developed seizures at around the same time. While this patients demographics, lack of travel history, and negative serologies are not typical of neurocysticercosis in the United States, the characteristic evolution of his cystic lesion from the vesicular to the granular stage on MRI with late-onset perilesional edema and a classical presentation of seizures is most consistent with neurocysticercosis. Considering the absence of other epidemiological risk factors and the occurrence of seizures in close contact during the same timeframe, we hypothesize that the patient was exposed to T. solium through the consumption of contaminated food in the United States.

Isolated primary CNS lymphoma after liver transplantation for autoimmune hepatitis: a case report

Post-transplantation primary central nervous system lymphoma (PT-PCNSL) is a rare neoplasm that occurs in immunocompromised patients. It can manifest months or years after transplantation, presenting with various neurological symptoms. A 64-year-old woman, who had received a liver transplant due to autoimmune hepatitis, presented with generalized weakness, headache, and confusion. Further investigation revealed multiple ring-enhancing lesions in the right frontal and temporoparietal regions on brain MRI. A brain biopsy confirmed the diagnosis of PT-PCNSL. This case underscores the importance of considering PT-PCNSL in the differential diagnosis of contrast-enhancing brain lesions in post-transplant patients. Timely recognition of PT-PCNSL is crucial for appropriate management and improved outcomes. To the best of our knowledge, this report describes the first instance of isolated CNS lymphoma in a liver transplant recipient, due to autoimmune hepatitis, successfully brought to complete remission with a rituximab-methotrexate regimen.

Intracranial dissemination of Klebsiella pneumoniae originating from pulmonary infection: a case report

BackgroundMetastatic brain abscesses caused by Klebsiella pneumoniae are extremely rare but life-threatening conditions. To depict a unique case of the middle-aged hypertensive man with an unusual presentation of metastatic brain abscesses originating from a pleural abscess caused by Klebsiella pneumoniae and subsequently leading to loss of consciousness (LOC).Case reportA 52-year-old Iranian man with a history of hypertension presented to the emergency department with a five-day history of worsening cough, high-grade fever, shortness of breath, chest pain, fatigue, and a productive cough. Laboratory tests revealed leukocytosis, elevated C-reactive protein, and respiratory alkalosis. A chest computed tomography scan confirmed pneumonia, and a brain scan revealed multiple hypodense lesions. Despite antibiotic therapy, the patient's condition worsened, leading to confusion, disorientation, and loss of consciousness. Magnetic resonance imaging revealed multiple ring-enhancing lesions, suggesting an abscess formation. Bronchial washings and BAL samples confirmed a lower respiratory tract infection. Cultures from the bronchial washings grew Klebsiella pneumoniae.ConclusionsMetastatic brain abscesses caused by Klebsiella pneumoniae are exceedingly rare but life-threatening conditions. Timely diagnosis and effective antimicrobial treatment are critical for patient outcomes. This case underscores the significance of recognizing atypical presentations of bacterial infections, as early detection and appropriate management can significantly impact patient outcomes.

Difficulty in diagnosing intracranial infection caused by Mycobacterium avium in an AIDS patient: case report and review of the literature

BackgroundMycobacterium avium complex (MAC) is an uncommon clinical pathogen, especially in the central nervous system (CNS), and carries a poor prognosis. MAC infections commonly present as immune reconstitution disease (IRD) in HIV patients. Herein, we report a case of intracranial infection caused by MAC in an AIDS patient without disseminated MAC (DMAC) and immune reconstitution inflammatory syndrome (IRIS).Case presentationA 31-year-old HIV-positive male presented us with progressively worsening CNS symptoms, and neuroimaging revealed ring-enhancing lesions. The intracranial lesions worsened after the empirical therapy for toxoplasma encephalitis and fungal infection. Due to the rapid progression of the disease, the patient died. Mycobacterium avium was the only pathogen in brain tissue after cultures and molecular biology tests.ConclusionMAC infection in CNS is challenging to diagnose in HIV patients. Our findings emphasize that obtaining tissue samples and applying molecular biology methods is essential to help diagnose the patient as soon as possible to receive adequate treatment.

Imaging Features of Immunodeficiency-Associated Primary CNS Lymphoma: A Review.

In the immunocompromised setting, there are distinct radiologic findings of primary central nervous system lymphoma (PCNSL), including necrotic ring-enhancing lesions, increased propensity for intralesional haemorrhage, and multiplicity. In this clinical context, advanced imaging with MR perfusion, spectroscopy, and diffusion-weighted imaging can be used to increase accuracy in the diagnosis of lymphoma over mimics such as high-grade glioma, metastases, or infection. This review summarizes the histology and pathophysiology of PCNSL in immunodeficient hosts, which provide a basis for its imaging appearances, prognosis, and treatment. This discussion is important for the general radiologist as the incidence of immunodeficiency-related PCNSL may be increasing.

Spinal Adhesive Arachnoiditis Following Surgical Treatment for an Intramedullary Tuberculoma of the Conus Medullaris: A Case Report from Western Mexico

Objectives: Describe a rare case of intramedullary tuberculoma (IMT) complicated by chronic adhesive arachnoiditis (CAA). Presentation of Case: A 19-year-old woman presented with complaints of weight loss, progressive weakness of both lower limbs, and urinary retention. Neurological examination corroborated the motor dysfunction of the lower limbs, associated with sensory disturbances. Magnetic resonance imaging (MRI) detected a ring-enhancing intramedullary mass that expanded the conus medullaris. A provisional diagnosis of neoplastic origin lesion was made and the patient received complete resection of the mass. Histopathology was consistent with tuberculoma. 8 months after beginning postoperative antituberculous therapy, neurological symptoms worsened and follow-up MRI showed a distorted spinal cord with arachnoid cysts and septations, findings that corresponded to CAA. Despite a new surgical intervention, the patient remained with lasting disability. Discussion: IMT is an uncommon presentation of spine tuberculosis. The clinical manifestations mimic those of any space-occupying lesion (SOL), and are dependent on the location in the spine, thus a differential diagnosis with neoplastic, inflammatory, and other granulomatous lesions is required. Being IMT an encapsulated lesion, it is unexpected that the inflammatory response extends to pia-arachnoid layers conducting to complications, such as CAA. The association between IMT and CAA must be recognized, since it undermines the outcomes of therapeutical interventions. Conclusion: The diagnosis of IMT complicated by CAA is challenging due to its low frequency. Therefore, this report emphasizes the importance of recognizing the clinical and radiological features of this association to allow an early diagnosis, and facilitate the selection of therapeutic interventions.

Imaging of Central Nervous System Infections in the Immunocompromised Patient

Immunocompromised patients are susceptible to the same infections as immunocompetent individuals and have an additional unique risk for atypical infections in the central nervous system (CNS). Many CNS infections carry a poor prognosis if not treated promptly, so it is prudent for radiologists to recognize key findings and have a high level of suspicion in immunocompromised patients. Moreover, a patient may have no known deficiency but can present with an atypical CNS infection as their first sign of an immunocompromised state, thus allowing the radiologist to be the first to suggest specific workup such as HIV testing. Because different infection sources (bacterial, fungal, and parasitic) have separate treatments, it is highly valuable to guide management in the right direction early in the diagnostic workup. This article discusses common opportunistic infections observed in the immunocompromised patient, primarily focusing on neuroimaging findings and pertinent clinical background and treatment for each disease entity. This article also emphasizes the importance of familiarity with the differential diagnosis for ring-enhancing lesions within the CNS.

Contralateral interhemispheric transcallosal transchoroidal approach to a thalamic glioma: illustrative case.

Thalamic lesions located in the floor of the lateral ventricle pose significant surgical challenges, given their proximity to critical neurovascular structures. Transcortical approaches are often limited by risks of injuring the eloquent cortex and nearby vessels. Furthermore, lesions extending into the third ventricle further impede accessibility. The corticospinal tract (CST), situated close to the thalamus, presents a major obstacle. Diffusion tensor imaging plays a crucial role in overcoming these challenges by accurately delineating the CST's location relative to the lesion, enabling surgeons to plan minimally invasive and safe access. A 32-year-old female presented with progressive right-sided hemiparesis over several days. Magnetic resonance imaging revealed a cystic ring-enhancing thalamic lesion extending into the third ventricle. While supine, the patient underwent surgery via a right pericoronal parasagittal craniotomy followed by a contralateral interhemispheric transcallosal transchoroidal approach. This case exemplifies the utility of the contralateral interhemispheric transcallosal approach for treating thalamic lesions, particularly those extending into the third ventricle. This minimally invasive approach minimizes retraction of the eloquent cortex and reduces the risk of neurovascular injury, potentially leading to improved surgical outcomes and faster recovery.

Case Report: A rare case of Intracranial tuberculous granuloma (tuberculoma) in a 19-year -old male

A tuberculoma is a clinical sign of tuberculosis that combines tubercles into a solid mass and can resemble several forms of malignant tumors on imaging. They frequently develop in people whose original tuberculosis infection is not well controlled. When they develop intracranially, tuberculomas are symptoms of CNS tuberculosis Meningitis, radiculomyelitis, bony spinal disease, and tuberculoma/tuberculous abscess are some of the symptoms of neurological tuberculosis (TB) that can also arise intracranially or in the spinal canal. comparable to other neurological TB symptoms. The majority of the time, the diagnosis of cerebral tuberculoma is presumptive and is based on radiological findings, additional supportive TB evidence from other areas, and treatment response. However, despite adequate TB treatment and concomitant corticosteroid therapy, lesions may persist for many years, as the therapeutic response of tuberculomas is unpredictable. A 19-year-old male patient admitted to the hospital for medical treatment complained of abdominal pain, constipation, nausea and vomiting, generalized weakness, fever, and chills. According to the patient’s complaints, my patient has a history of tonic-clonic seizures dating back a month, as well as a history of typhoid fever and sickle cell disease AS pattern, both of which he had been receiving treatment at a civil hospital. At the time of admission, he had undergone a number of invasive and non-invasive investigations, including a CT brain plane and an MRI brain with contrast. Brain computed tomography (CT) revealed a persistent lacunar infarct in the left corona radiata. Acute infarct in the right corona radiata, abnormal meningeal enhancement on post-contrast with meningitis, multiple ring-enhancing lesions in the bilateral cerebral hemisphere, cerebellum, corpus callosum, and intracranial tuberculous granuloma are all revealed by MRI with contrast. left corona radiata chronic infarction.

A disease warranting attention from neurosurgeons: primary central nervous system post-transplant lymphoproliferative disorder.

Primary central nervous system post-transplant lymphoproliferative disorder (PCNS-PTLD) is a rare condition, posing diagnostic and treatment challenges, with histological biopsy essential for diagnosis. Standardized treatment protocols are lacking. This disease requires urgent attention due to the increasing number of organ transplant surgeries and the use of immunosuppressive agents. From 2020 to 2023, our center diagnosed five patients with PCNS-PTLD. We reviewed their clinical records and conducted a comprehensive analysis of 22 literatures on PCNS-PTLD cases following renal transplantation or allogeneic hematopoietic stem cell transplantation (HSCT). Four patients had previously received a kidney transplant, one had undergone allogeneic HSCT. The median time from the last transplant surgery to the diagnosis of PCNS-PTLD differs between kidney transplant (21.5 years) and allogeneic HSCT (9 months). Common symptoms included motor weakness (n = 4), headache (n = 2), confusion (n = 2), and nausea (n = 2), with ring-enhancing (n = 5), typically solitary (n = 3) and supratentorial (n = 3) lesions on imaging. Diagnosis involved robot-assisted stereotactic brain biopsy (n = 4) or craniotomy (n = 1), all showing Epstein-Barr virus and CD20 positivity. Most cases (n = 4) were monomorphic diffuse large B-cell lymphoma. Treatment included rituximab (n = 3), surgical resection (n = 2), zanubrutinib (n = 1), whole-brain radiation (n = 1), and methotrexate (n = 1). At the last follow-up, the median duration of follow-up for all patients was 19 months. During this time, 3 patients had died and 2 patients were still alive. In patients with a history of kidney transplantation or allogeneic HSCT who are on long-term immunosuppressive therapy, any neurological symptoms, particularly the presence of supratentorial ring-enhancing masses in the brain on imaging, whether solitary or multiple, should raise high suspicion for this disease, warranting a timely brain biopsy. Additionally, we found that besides reducing immunosuppressants, zanubrutinib may be a potential, safe, and effective treatment for this condition. Moreover, post-surgical administration of rituximab in conjunction with whole-brain radiotherapy also appears to be a potentially safe and effective approach.

Peak Resembling N-acetylaspartate (NAA) on Magnetic Resonance Spectroscopy of Brain Metastases.

Background and Objectives: Differentiating between a high-grade glioma (HGG) and solitary cerebral metastasis presents a challenge when using standard magnetic resonance imaging (MRI) alone. Magnetic resonance spectroscopy (MRS), an advanced MRI technique, may assist in resolving this diagnostic dilemma. N-acetylaspartate (NAA), an amino acid found uniquely in the central nervous system and in high concentrations in neurons, typically suggests HGG over metastatic lesions in spectra from ring-enhancing lesions. This study investigates exceptions to this norm. Materials and Methods: We conducted an MRS study on 49 histologically confirmed and previously untreated patients with brain metastases, employing single-voxel (SVS) techniques with short and long echo times, as well as magnetic resonance spectroscopic imaging (MRSI). Results: In our cohort, 44 out of 49 (90%) patients demonstrated a typical MR spectroscopic profile consistent with secondary deposits: a Cho peak, very low or absent Cr, absence of NAA, and the presence of lipids. A peak at approximately 2 ppm, termed the "NAA-like peak", was present in spectra obtained with both short and long echo times. Among the MRS data from 49 individuals, we observed a peak at 2.0 ppm in five brain metastases from mucinous carcinoma of the breast, mucinous non-small-cell lung adenocarcinoma, two metastatic melanomas, and one metastatic non-small-cell lung cancer. Pathohistological verification of mucin in two of these five cases suggested this peak likely represents N-acetyl glycoproteins, indicative of mucin expression in cancer cells. Conclusions: The identification of a prominent peak at 2.0 ppm could be a valuable diagnostic marker for distinguishing single ring-enhancing lesions, potentially associated with mucin-expressing metastases, offering a new avenue for diagnostic specificity in challenging cases.

Fanconi anemia neuroinflammatory syndrome: brain lesions and neurologic injury in Fanconi anemia

AbstractFanconi anemia (FA) is a complex inherited bone marrow failure syndrome characterized by chromosomal instability and defective DNA repair, causing sensitivity to DNA interstrand crosslinking agents. Our understanding of the full adult phenotype of the disease continues to evolve, because most patients with FA died of marrow failure in the first decade of life before more recent advances in allogeneic hematopoietic cell transplantation. Herein, we report a previously undescribed, clinically concerning, progressive neurologic syndrome in patients with FA. Nine nonimmunosuppressed pediatric patients and young adults with FA presented with acute and chronic neurological signs and symptoms associated with distinct neuroradiological findings. Symptoms included, but were not limited to, limb weakness, papilledema, gait abnormalities, headaches, dysphagia, visual changes, and seizures. Brain imaging demonstrated a characteristic radiographic appearance of numerous cerebral and cerebellar lesions with associated calcifications and often a dominant ring-enhancing lesion. Tissue from the dominant brain lesions in 4 patients showed nonspecific atypical glial proliferation, and a small number of polyomavirus-infected microglial cells were identified by immunohistochemistry in 2 patients. Numerous interventions were pursued across this cohort, in general with no improvement. Overall, these patients demonstrated significant progressive neurologic decline. This cohort highlights the importance of recognizing FA neuroinflammatory syndrome, which is distinct from malignancy, and warrants careful ongoing evaluation by clinicians.

Disseminated Tuberculosis Presenting Section as Transverse Myelitis with Bone Marrow Involvement: A Rare Case of Pyrexia of Unknown Origin

In India, both pulmonary and Extrapulmonary Tuberculosis (TB) are prevalent. Central Nervous System TB (CNS-TB) is rare, with spinal intramedullary TB (SIMT) presenting as Longitudinally Extensive Transverse Myelitis (LETM) being even rarer. Diagnosing LETM often involves considering alternative aetiologies, frequently overlooking TB, particularly in patients without primary pulmonary TB. A 31-year-old male presented with high-grade fever, weight loss, and right hypochondriac pain. Initial investigations revealed pancytopenia and hepatosplenomegaly. Bone marrow biopsy showed granulomas and Acid-Fast Bacilli (AFB), but there was no evidence of Mycobacterium tuberculosis on the Cartridge-based Nucleic Acid Amplification Test (CBNAAT), leading to a presumptive diagnosis of disseminated TB. The patient was started on Antitubercular Therapy (ATT) but was non compliant with his medication, resulting in worsening symptoms, including paraparesis and urinary bladder involvement. Further investigations revealed LETM and ring-enhancing lesions in the brain. Despite negative CSF CBNAAT tests, empirical ATT with corticosteroids was resumed, and Mycobacterium tuberculosis was later confirmed via Lowenstein-Jensen (LJ) culture of the bone marrow. This case underscores the diagnostic challenges of disseminated TB with LETM, highlighting the importance of a high clinical suspicion and thorough evaluation, especially in endemic regions.

Antitubercular medications and levetiracetam-induced symmetric drug-related intertriginous and flexural exanthema

Symmetric drug-related intertriginous and flexural exanthema (SDRIFE) is a rare, distinctive cutaneous adverse reaction associated with various medications. Here, we present the case of a 48-year-old male, admitted with complaints of slurring of speech with a deviation of face with abnormal movements and posturing of hands and limbs and loss of consciousness for about 15 min. Magnetic resonance imaging (MRI) brain with angiography was done which was suggestive of a ring-enhancing lesion with perilesional edema hinting toward the possibility of tuberculoma. A contrast MRI brain was done which was suggestive of leptomeningeal and pachymeningeal left frontal region with perilesional edema suggestive of tuberculoma so the patient was started on antitubercular therapy and dexamethasone and levetiracetam. The patient developed redness over the lower abdomen which gradually progressed to involve the lower back, bilateral axilla, and upper back. Potential suspected drugs such as antitubercular therapy and levetiracetam were stopped and the patient improved. The patient was started on another antiepileptic injection lacosamide. Antitubercular therapy was started again, on starting isoniazid 75 mg the patient started developing itching again, which was managed by giving antihistaminic. This case report highlights the importance of recognizing and managing SDRIFE as a potential complication of combination drug therapy and the need for vigilant monitoring of patients receiving such medications.

Primary Central Nervous System ALK-negative Anaplastic Large Cell Lymphoma, with TP53 Deletion

Abstract Introduction/Objective ALK-negative anaplastic large cell lymphoma (ALCL) primary to the central nervous system (CNS), is a sporadic and rare lymphoma, characterized by neoplastic T-cells which are CD30 positive and ALK negative. It has a male predominance, mostly affects old adults and usually displays supratentorial, single or multiple lesions. Methods/Case Report We report the case of a 57-year-old woman with medical history of breast cancer, S/P lumpectomy and radiation therapy, who came to our institution with confusion, partial aphasia and headache. MRI showed a thick-walled, irregular, ring enhancing mass in the periventricular white matter of the occipital and temporal horns of the lateral ventricle with surrounding vasogenic edema and mass effect. It was isointense to cortex on T1- and heterogeneously hyperintense on T2-weighted images with mild diffusion restriction in the enhancing portion. A left parieto-occipital decompressive craniotomy was performed and tissue was procured for diagnosis. The biopsy showed an infiltrating, angiocentric neoplasm, composed of large anaplastic cells, including hallmark cells with "horseshoe" nuclei, abundant eosinophilic cytoplasm and occasional perinuclear clearing. Large areas of necrosis and pericellular reticulin deposits of the vascular walls were also noted. On immunohistochemistry, the neoplastic cells diffusely expressed CD45, CD2, CD3, CD25, CD43, MUM1, and CD30, and were negative for ALK, CD20, CD79a, PAX-5, CD15, CD5, BCL-6, BCL-2, Granzyme B, GFAP, Pancytokeratin. In situ hybridization for EBER was negative. The proliferative index (Ki-67), while variable, was as high as 80%. TP53 deletion was detected by FISH in 100% of the cells analyzed. No rearrangements in the ALK or MYC genes was noted by FISH. Additional studies revealed a complex karyotype including loss of chromosomes 9 and 10, gain of chromosome 17 and a marker chromosome, and structural rearrangements involving chromosomes 4, 10, and 13. Previously reported rearrangements involving DUSP22 (6p25) and TP63 (3q28) were not identified. TCR gene rearrangement was also identified by PCR. High dose Cytarabine/Methotrexate, and radiation were not successful in controlling disease progression and home hospice was recommended. Results (if a Case Study enter NA) N/A Conclusion This is an infrequent type of primary CNS lymphoma with a poor prognosis and, while TP53 has been reported in sporadic, and cutaneous ALCL, to our knowledge, this is the first report of primary CNS ALK-negative anaplastic large cell lymphoma with TP53 deletion.