Leptomeningeal metastasis from supratentorial malignant gliomas.

The clinical and diagnostic findings in 13 patients with leptomeningeal metastasis from supratentorial malignant gliomas are reported. Criteria for inclusion in this study were positive myelographic examination, positive cerebrospinal fluid cytology on two or more samples, or evidence of leptomeningeal seeding at autopsy. Eight patients had premortem symptoms of leptomeningeal metastasis, with the diagnosis confirmed during life in 5 patients. Average survival after the onset of symptoms was 3 months (range, 1 to 5 months). Comparison of the autopsied group with 10 concurrent autopsied patients without leptomeningeal gliomatosis did not reveal any significant differences in age, but leptomeningeal gliomatosis was more prevalent in patients with longer postoperative survival. Leptomeningeal involvement at autopsy was more extensive in symptomatic patients. Cerebrospinal fluid examination often gave nondiagnostic or nonspecific results. Computed tomography of the brain showed evidence of ventriculomegaly, periventricular contrast enhancement, or multifocal tumor involvement in every case. Iophendylate myelography was the most reliable diagnostic tool and established the diagnosis whenever performed. The natural history and clinical significance of leptomeningeal metastasis from supratentorial malignant gliomas are discussed.