Three Rare Localizations of Intracranial Dermoid Tumors

Abstract

Intracranial dermoid tumors are extracerebral congenital cysts. Dermoid cysts have two types as intradural and extradural. Intradural dermoid cysts are originated from the intracranial cerebrospinal fluid space. However, calvarium-originated extradural lesions increase in size with a slow growth in cyst volume, but the cause of active growth is unknown. Dermoid cysts act like slow-growing cerebral tumors. Differential diagnosis includes other cysts and cystic tumors. Their radiologic appearance looks like polycystic lesions which is associated with a wide expansion in the cerebrospinal fluid areas and cause brain translocation. In the cranial tomography and magnetic resonance imaging assessment, high-cholesterol-containing dermoids demonstrate cerebrospinal fluid characteristics. The present study based on the review of central nervous system patients with highly rare dermoid localizations such as calvarial bone, temporal lobe and lateral ventricle.

Intracranial Interdural and Extradural Cerebellar Convexity Dermoid Cyst: A Case Report of Rare Tumor at the Rarest Location

“…Extradural DCs are much rarer and have been reported in the midline of the posterior fossa, anterior fontanel, and orbital region in children. 1 2 Interdural DC in the lateral wall of cavernous sinus has also been cited. 1 4 But DC in the region of cerebellar convexity at an unusual lateral location with both interdural and extradural components holds its paucity.…”

“… 1 2 Interdural DC in the lateral wall of cavernous sinus has also been cited. 1 4 But DC in the region of cerebellar convexity at an unusual lateral location with both interdural and extradural components holds its paucity. Esaki et al have described an atomically similar case.…”

“…But in cases of extensive adhesion between the cyst wall and the surrounding vital neurovascular structures, subtotal resection can be contemplated. 1 2 4 …”

“…Intracranial dermoid cysts (DCs) are rare dysembryonic tumors of benign nature, accounting for 0.04 to 0.7% of all intracranial space-occupying lesions. 1 Because of their congenital origin, they are mostly seen in infants and young adults, and comparatively rarely in older age groups. 2 They have a predilection for midline or lines of embryonic fusion.…”

“…3 DCs of interdural space or extradural space are infrequent and only few cases have been reported. 1 2 4 Herein, the authors present an interesting case of a large cerebellar convexity DC with both interdural and extradural components, compromising venous drainage of the ipsilateral transverse and sigmoid sinus. The patient was managed successfully by microneurosurgical decompression.…”