<unk>  is a relatively rare malignant neoplasm and accounts for a small proportion of all intracranial germ cell tumors. It is an aggressive tumor and has a propensity to metastasize systemically. A component of<unk><unk>  is often found in mixed germ-cell tumors, in which case it is usually the most aggressive component, and dictates prognosis. Pure<unk>  tumors do not secrete β-HCG or AFP. On microscopic histopathological analysis,<unk>  is characterized by: Poorly differentiated, pleomorphic cells in cords, sheets, or papillary formation, indistinct cell borders, nucleoli, vesicular nuclei (clear, empty appearing nuclei) and necrosis. If left untreated, patients with<unk>  may progress to develop seizures, obstructive hydrocephalus, and CSF metastasis. Common complications of<unk>  include: Obstructive hydrocephalus, leptomeningeal spread, and systemic metastasis.  The clinical presentation of<unk>  is mainly from the obstructive hydrocephalus secondary to compression of the tectum of the midbrain and obstruction of the aqueduct. Symptoms of<unk>  include headaches, nausea, vomiting, seizures, hearing loss, sleepiness, and double vision. Compression of the superior colliculi can lead to a characteristic gaze palsy, known as Parinaud syndrome. Head CT and brain MRI may be diagnostic of<unk> . Biopsy is generally done to confirm the diagnosis of<unk> . The mainstay of therapy for<unk>  is radiotherapy and/or chemotherapy. Sometimes, surgical resection may be done. CSF diversion, radiation, and stereotypical surgery are alternative treatment options based on the patient situation.
Pineal embryonal carcinoma
Pineal yolk sac tumor
Pineal germinoma
Pineal gland cyst
Pineal gland tumor
Hidrocystoma
Spiradenoma
Pineoblastoma