Primary intraosseous malignant peripheral nerve sheath tumor of spine with a giant paraspinal and retrospinal subcutaneous extension.

Background: According to World Health Organization (WHO) classification of tumors, malignant peripheral nerve sheath tumors (MPNST) encompass the tumors, which were previously termed as malignant schwannoma, neurogenic sarcoma, and neurofibrosarcoma. These are rare tumors constituting only 5% of all malignant soft tissue tumors. As per their name, they arise from the malignant proliferation of cells forming sheath of a nerve root.

Pineal epidermoid.

Background: Tumors of pineal region are uncommon, accounting for ≤1% of intracranial tumors in adults and 3-8% of pediatric brain tumors. Epidermoid cysts account for 0.2-1% of all intracranial tumors.

Large intradural craniospinal arachnoid cyst: A case report and review of literature.

Presence of an arachnoid cyst at craniospinal junction is not very common. This is a very rare anatomic site, with only seven other cases reported in the literature. We report a case of large intradural craniospinal arachnoid cyst presenting with obstructive hydrocephalus and cranial nerve palsy.