A case of cerebellopontine angle epidermoid tumor and brainstem squamous cell carcinoma presenting as collision tumor.

摘要

'Collision' brain tumors are described as a clinical situation when two tumors of diverse histological nature are in close proximity to each other, giving an impression that the two are in direct contact or in collision with each other [4, 5]. We report a 'collision' tumor where an epidermoid tumor was in collision with an intra-axial brainstem tumor that was diagnosed to be a squamous cell carcinoma. The squamous cell carcinoma probably arose from the epithelial lining of the epidermoid tumor.