Pineal Gland Tumors: Causes, Symptoms and Treatment — Overview, Diagnosis & Treatment Options | MyMedicPlus

Pineal region tumors are rare, accounting for less than 1% of CNS tumors. They encompass germ cell tumors (germinoma, non-germinomatous), pineocytoma, pineoblastoma, and pineal parenchymal tumors of intermediate differentiation (PPTID). They primarily affect children, adolescents, and young adults.

Most cases are sporadic with no identified cause. Pineoblastoma may occur in hereditary retinoblastoma (trilateral retinoblastoma, RB1 mutation). Radiation exposure and immunosuppression may increase CNS germ cell tumor risk. Males are predominantly affected by pineal germinomas.

Parinaud's syndrome (upgaze palsy, convergence-retraction nystagmus, pupillary light-near dissociation) results from tectal compression. Obstructive hydrocephalus causes headache, nausea, vomiting, and papilledema from Sylvian aqueduct obstruction. HCG-secreting tumors may cause precocious puberty in males.

MRI brain with gadolinium is primary imaging. CSF tumor markers (AFP elevated in yolk sac tumors; beta-HCG in choriocarcinoma/mixed GCTs) are critical. Stereotactic or endoscopic biopsy for tissue diagnosis. Ophthalmologic assessment for Parinaud's syndrome. WHO grading for pineal parenchymal tumors.

Hydrocephalus is managed with endoscopic third ventriculostomy or VP shunt. Germinomas: highly radiosensitive — craniospinal irradiation plus ventricular radiotherapy with or without cisplatin-based chemotherapy achieves excellent outcomes. Non-germinomatous GCTs: combined chemotherapy plus radiation. Pineoblastoma: aggressive multimodality therapy similar to medulloblastoma protocols.

Germinomas: 5-year survival exceeds 90% with appropriate treatment. Pineocytoma (WHO grade I): 5-year survival approximately 86%. Pineoblastoma (WHO grade IV): 5-year survival approximately 58-60%. Non-germinomatous GCTs: 5-year survival approximately 50-70% depending on histological composition and extent of disease.