A Case of Gastric Meningeal Carcinomatosis Involving Bilateral Hearing Loss: The Difference between Clinical Images and Autopsy Findings.

We describe a rare case of meningeal carcinomatosis (MC) in a 66-year-old man who presented with bilateral deafness and vertigo, initially presumed to be neurofibromatosis type-2. Brain magnetic resonance imaging (MRI) of the patient revealed bilateral gadolinium enhanced masses at the cerebellopontine angle. However, multiple central nervous system symptoms, including loss of consciousness, gradually appeared. He had a history of gastric cancer; therefore, a lumbar puncture was performed. Cytological examination of the cerebrospinal fluid confirmed the presence of adenocarcinoma cells. The general condition of this patient worsened, and he died 46 days after the first onset of hearing loss. An autopsy was performed, and multiple infiltrations of adenocarcinoma cells in the brain were confirmed, though undetected by MRI. The prognosis of MC is extremely poor; therefore, rapid diagnosis is important to prevent mortality. Retrospectively, a lumbar puncture could have been conducted earlier to identify MC, especially in consideration of the clinical history of this patient.