Multicystic metastatic carcinoid to brain: case report.

Symptomatic intraparenchymal brain metastases from carcinoid tumors are unusual, and neurological deficits are rarely the first symptom of underlying carcinoid primaries. We report a patient with multiple cystic metastases to the brain from a lung primary who first presented with headaches and seizures. Serotonin was present within the fluid of the cystic cavities, and serum serotonin concentrations were normal. Magnetic resonance imaging of the brain revealed several metastases not present on the initial head computed tomography scan.