Complete removal of a cavernous malformation in the dorsal pons, in contact with the expanded transpontine vein: illustrative case

Craniotomy is required for the removal of brainstem cavernous malformations (CMs) with repeated hemorrhage, and this condition is often complicated by an accompanying developmental venous anomaly (DVA). However, a DVA of the brainstem or cerebellum with drainage penetrating the pons is an exceptional finding.