pneumoventricle

Air in the ventricular system of the brain; occurs as a complication of a fracture of the skull that passes through the accessory nasal sinuses.

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pneu·mo·ven·tri·cle (noo″mo-venґtrĭ-kəl) [pneumo- + ventricle] pneumocephalus in one of the cerebral ventricles; called also pneumoventriculi.