Abstract
Through retrospective analysis of 13 cases of magnetic resonance image (MRI) manifestations of atypical meningiomas confirmed by operation and pathology in the First Affiliated Hospital of Xinxiang Medical University, the objective of this study was to evaluate the diagnostic value of MRI in order to improve the accuracy rate of preoperative diagnosis. In this retrospective analysis of MRI findings for atypical meningiomas in First Affiliated Hospital of Xinxiang Medical University from January to July in 2012, the location, morphology and tumor signals and other tumor imaging characteristics were covered. In 13 cases of atypical meningioma patients of this group, most tumors were located at typical sites (10/13), mainly the falx cerebri, parasagittal, convexity, saddle area. Only two cases were at atypical locations, 1 in the cerebellar hemisphere and 1 in a lateral ventricle. Most of the tumors showed T1 and T2 isointensity signals, and necrosis, calcification, and peritumoral edema were always featured. DWI showed isointensity in 11 cases (11/13), and hyperintensity in 2. Some 9 cases had dural tail signs, 12 had accurate positioning (12/13), and 2 were postoperative recurrences. MRI has high value in the diagnosis of atypical meningiomas, with important roles in early clinical diagnosis, treatment and prognosis evaluation.
Highlights
Meningiomas are the most common intracranial tumors, accounting for about 15%-20% intracranial tumors (Zhang et al, 2012)
Through retrospective analysis of 13 cases of magnetic resonance image (MRI) manifestations of atypical meningiomas confirmed by operation and pathology in the First Affiliated Hospital of Xinxiang Medical University, the objective of this study was to evaluate the diagnostic value of MRI in order to improve the accuracy rate of preoperative diagnosis
Atypical meningioma radiological manifestations are diverse (Sriram, 2013), which can grow in different part of the brain, when tumor size is small or location is not sensitive, patients may have no symptoms or mild symptoms, such as chronic headache, and when the tumor grew in the brain or sensitive parts, it may show nerve oppression symptoms, such as partial numbness, weakness, seizures, hyposmia, decreased visual acuity, facial numbness or spasm, unilateral hearing loss, psychiatric symptom, and can appear intracranial hypertension symptoms such as headache, vomiting, retinal edema in serious cases (Zaher et al, 2013)
Summary
Meningiomas are the most common intracranial tumors, accounting for about 15%-20% intracranial tumors (Zhang et al, 2012). Atypical meningioma (AM) is a kind of anaplastic tumor between the benign meningioma (BM) and malignant meningioma (MM), its biological behavior is bad, and has aggressive invasion, easy postoperative recurrence, and bad prognosis. The correct preoperative qualitative diagnosis plays an essential role on making operation scheme and treatment plan. The AM imaging features are various symptoms, WHO classifies it into grade II (Kleihuse et al, 2002). This study collected 13 cases atypical meningioma confirmed by pathology, and underwent analysis and summary of their MRI performance, so as to improve the diagnostic level of atypical meningioma
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