Utility and safety of a novel surgical microscope laser light source.

Objective: Tissue injuries caused by the thermal effects of xenon light microscopes have previously been reported. Due to this, the development of a safe microscope light source became a necessity. A newly developed laser light source is evaluated regarding its effectiveness and safety as an alternative to conventional xenon light source.

Jugular Foramen Collision Tumor (Schwannoma and Plasma Cell Pseudotumor), a Probable IgG4-Related Disease.

Background: Lower cranial nerve sheath tumors are relatively rare. Cases of schwannoma collision tumors have rarely been reported, with most of the reported cases describing schwannoma and meningioma collision tumors.

Case Description: We report a very rare case of a cerebellopontine angle collision tumor of the ninth cranial nerve schwannoma with an IgG4 plasma cell pseudotumor.