teratomas with well differentiated tissues - mostly in males, and formed from a variety of cell types such as bone, muscle, cartilage and dermis. They are often well demarcated. Poorly differentiated, malignant types may occur.
geminomas - malignant and resembles seminomas of the testes. May spread to the floor or anterior wall of the third ventricle and seed the CSF to the spinal cord or cauda equina.
pineocytomas and pinealblastomas - these are rare tumours of true pineal origin. They account for less than 20% of pineal tumours. The pineocytoma is a well differentiated and slow growing tumour; the pinealblastoma, poorly differentiated and rapidly growing.
gliomas - both astrocytomas arising from cells within the pineal gland or from adjacent brain, and ependymomas, arising from cells lining the third ventricle, occur.
meningiomas, dermoid and epidermoid cysts occur rarely
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