Abnormal posterior cranial fossa morphology

What it means

An abnormality of the fossa cranii posterior (the posterior fossa), which is made up primarily of the occipital bone and which surrounds to the foramen magnum.

The floor of the cranial cavity is divided into three distinct depressions called the anterior, middle, and posterior cranial fossa. The posterior cranial fossa, the most posterior and deep of the three cranial fossae, accommodates the brainstem and cerebellum. Abnormalities of the posterier cranial fossa can be demonstrated by cerebral magnetic resonance imaging or computer tomography.

Rare diseases that can present with this13

The range is how often this sign appears among people diagnosed with each disease — it is not a probability of having any of them. Many of these signs also occur in common, non-rare conditions. A sign on this page is a conversation to have with a clinician, not a conclusion.

Part of the broader category

Also called: Abnormality of the posterior cranial fossa · Abnormality of the posterior fossa · Posterior fossa anomaly