Choriocarcinoma of the central nervous system

Choriocarcinoma of the central nervous system (CNS choriocarcinoma) is an extremely rare and aggressive malignant germ cell tumor that arises within the brain. Classified under intracranial germ cell tumors, it is composed of malignant cytotrophoblastic and syncytiotrophoblastic cells that produce high levels of beta-human chorionic gonadotropin (β-hCG). The ICD-10 code C71.2 corresponds to a malignant neoplasm of the temporal lobe, though CNS choriocarcinoma can occur in various intracranial locations, with a predilection for midline structures such as the pineal gland and suprasellar region. This tumor predominantly affects children, adolescents, and young adults, with a notable male predominance. Key symptoms depend on tumor location and may include headaches, nausea, vomiting, visual disturbances (particularly bitemporal hemianopia when the suprasellar region is involved), diabetes insipidus, hormonal imbalances including precocious puberty in children, and signs of raised intracranial pressure such as papilledema. Hemorrhage within the tumor is common due to its highly vascular nature, which can lead to acute neurological deterioration. Patients may also present with focal neurological deficits, seizures, and hydrocephalus due to obstruction of cerebrospinal fluid pathways. Treatment typically involves a multimodal approach combining platinum-based chemotherapy (such as cisplatin, etoposide, and bleomycin or ifosfamide-based regimens) with radiation therapy. Surgical resection may be attempted when feasible, though complete removal is often challenging due to the tumor's location and infiltrative nature. Despite aggressive treatment, CNS choriocarcinoma carries a poorer prognosis compared to other intracranial germ cell tumors such as germinomas. Elevated serum and cerebrospinal fluid β-hCG levels serve as important diagnostic and monitoring biomarkers. Early diagnosis and prompt initiation of combination therapy are critical for improving outcomes.

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