No 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.

Collecting duct carcinoma of the kidney is a rare variant of renal cell carcinoma. Hematuria is the most common presenting symptom. This tubulopapillary tumor arises from or differentiates forward to medullary collecting tubules. It is typically centered on the medulla of the kidney and extends into the cortex with a desmoplastic reaction. There are few reports documenting the clinical presentation and long-term prognosis. We describe a case of this uncommon tumor with clinical, histological and immunohistochemical features and review the literature.

Medulloblastoma is one of the most common primitive neuroectodermal tumors at pediatric age. It is usually located at fourth ventricle originated from vermis. Pontocerebellar angle medulloblastomas are rare and are mostly localized intraaxially. It can be confused with other tumors such as meningioma and schwannoma which are usually seen at this zone. In this report, a 16-year-old girl having medulloblastoma located at the pontocerebellar angle extraaxially and mimicking as meningioma was presented.

Secondary leptomeningeal gliomatosis is a condition known as a result of invasion of the subarachnoid space or the ventricular system of primary intraparenchymal glioma. In this article, we present a 7-year-old boy presented with neck and back deformity and deterioration of gait. Cranial and spinal magnetic resonance imaging revealed lesions in the supratentorial and infratentorial areas, in the brainstem downward the spinal cord. Disseminated oligodendrogliomatosis is extremely rare and our case we present is the 24 th in the literature.