<unk>  is a rare type of extra gonadal<unk> <unk><unk> . They make up a small fraction of all intracranial germ cell<unk> s and an even small fraction of pineal masses overall.Pure<unk> s secrete AFP.On microscopic histopathological analysis,<unk>  is characterized by poorly differentiated endothelial-like, cuboidal, or columnar cells with prominent nucleoli and significant mitotic activity.Pineal<unk> <unk><unk>  is demonstrated by positivity to<unk>  markers such as AFP, cytokeratin, and AAT.In upto 50% of cases, these<unk> s co-exist with other germ cell<unk> s<unk>  may be associated with Down syndrome.Common complication of<unk>  includes obstructive hydrocephalus.Prognosis of<unk>  is generally poor.Symptoms of<unk>  include headache, nausea, vomiting, weakness, confusion, and somnolence.Head CT scan and brain MRI may be helpful in the diagnosis of<unk> .On head CT scan,<unk>  is characterized by a hypodense, heterogenous mass in the pineal region with signs of obstructive hydrocephalus.On brain MRI,<unk>  is characterized by hypointensity on T1-weighted images and hyperintensity on T2-weighted images.There may be enhancement after contrast administration.Biopsy is generally done to confirm the diagnosis of<unk> .
Pineal yolk sac tumor
Pineal embryonal carcinoma
Pineoblastoma
Pineal germinoma
Medulloblastoma
Pineal gland cyst
Choroid plexus papilloma
Sacrococcygeal teratoma