Original ArticleMagnetic resonance imaging findings of intracranial papillary meningioma: a study on eight cases
Introduction
Meningiomas are common neoplasms accounting for approximately 13% to 19% of all primary intracranial tumors, represent a wide biological and histological spectrum, and generally have a favorable prognosis [1]. However, intracranial papillary meningioma (PM) is a rare, distinctive malignant histological variant of meningioma that has a higher incidence of recurrence and invasion or metastasis than other benign variants of meningioma [2], [3], [4]. Owing to the aggressive clinical course and poor prognosis of PM, a timely recognition of the diagnosis is desirable and helpful for rationalizing approaches to therapy.
Previous reports have concentrated on the histogenetic, histopathological, and clinical characteristics of PMs [1], [2], [3], [4], [5], [6], but only sporadic case reports have been able to describe imaging findings on PMs [7]. The purpose of the present study is to analyze the magnetic resonance imaging (MRI) findings and describe the clinical features of PMs.
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Materials and methods
Approval of the institutional review board was obtained, and the requirement for patient consent was waived for this retrospective study. A retrospective review was performed from December 2007 to February 2010 at Huashan Hospital on eight patients with surgically and histologically proven PM. The patients included five men and three women ranging from 24 years to 54 years of age, with a median age of 35 years at first diagnosis.
MRI was performed in all eight patients using a 1.5 T MRI unit
Results
The clinical and MRI findings of all patients are summarized in Table 1. The median age of the patients was 35 years with a male to female ratio of 5:3. Most patients exhibited symptoms, including headache (n=5), epileptic seizures (n=3), and dizziness (n=2). Other presenting symptoms included hemiparesis (n=1), vomiting (n=1), tinnitus (n=1), and blurred vision (n=1). Symptom duration ranged from 2 weeks to 4 months, with an average of 2 months. Six patients had primary PMs, and the two other
Discussion
PM is a rare, distinctive malignant histological variant of meningioma with an incidence of 1.0% to 2.5% of all intracranial meningiomas [6], [7]. It was first described in 1938 by Cushing and Eisenhardt [8] as a papillary pattern in a meningioma showing intracerebral recurrence and pulmonary metastasis.
Histopathological examination revealed a tumor composed of sheets of cells arranged in a perivascular pseudopapillary pattern, along with a few well-formed papillae with a central fibrovascular
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Xiang-Rong Yu and Jun-Zhang contributed equally to this work.