Case Report
Sandra C Yan, Nelli S Lakis, E
Abstract
Collision tumors or metastasis from an extracranial tumor to a primary brain neoplasm are rare but do occur. The majority involve metastases to meningiomas. This case presents the second documented collision of a systemic chronic lymphocytic leukemia (CLL) to a glioblastoma multiforme (GBM). Lymphomas tend to coalesce in perivascular locations, and the characteristic vascularity of glioblastomas may present a very inviting milieu for lymphoma cells.