What is tentorial notch?

The tentorial notch is a small indentation or opening in the tentorium cerebelli, a structure in the brain that separates the cerebrum from the cerebellum. The tentorial notch allows for the passage of important structures, such as the midbrain and associated blood vessels, between the two brain regions.

Damage to the tentorial notch can result in compression of the structures passing through it, leading to symptoms such as headache, visual disturbances, and changes in consciousness. In severe cases, compression of the midbrain can result in serious neurological deficits.

Conditions that may cause compression of the tentorial notch include intracranial hemorrhage, brain tumors, and swelling of the brain. Treatment for tentorial notch compression depends on the underlying cause and may include surgery, medication, or other interventions to relieve pressure on the affected structures.