Microcystic Variant of an Intraosseous Meningioma in the Frontal Area: A Case Report

Abstract

Meningiomas located inside the bone of the calvaria belong to the group of rare types of tumours. The microcystic variant is the least common in this area. Due to their similarity to other tumours in this area, the imaging test of those tumours may constitute the source of an improper preoperative diagnosis. According to the records of the Department of Neurosurgery in Bielsko-Biała, 133 patients diagnosed with an intracranial meningioma confirmed by a histopathological test were operated in the last 10 years (2004–2014). In the histopathological test, three patients were diagnosed with the microcystic variant, which constitutes 2.25% of the cases. Only one variant of microcystic meningioma was located inside the bone, which constitutes 0.75% of all the meningiomas operated.

A primary intraosseous cystic meningioma: Case report

“…Meningiomas that have within them, or in a surrounding area, a cyst filled with fluid are consequently defined as cystic [7]. They should not be confused with microcystic meningiomas, which are a histological variant of this tumor [8]. Nauta’s classification [9] divides cystic meningiomas into 4 groups: in types I and II the cysts are intratumoral, in types III and IV the cysts are extratumoral.…”

Meningiomas – insights into genetics and correlations with histological features

“…The atypical variants of meningiomas are much larger and commonly show areas of necrosis. The microcystic subtype is particular by intratumoral or peritumoral cysts formation [35,36].…”