primary leptomeningeal melanomaleptomeningeal myelomatosisleptomeningeal carcinomatosisleptomeningeal angiomatosisleptomeningeal metastatic diseaseleptomeningeal metastasesleptomeningeal inflammationleptomeningeal lesionsleptomeningeal meningitisleptomeningeal amyloidosisleptomeningeal disease prognosisleptomeningeal fibrosis