The protruding bone is anatomically located at the occipital tuberosity, which is generally present in normal people.

Occipital protuberance is congenital, everyone has it, but some people are more prominent. It is not a brain tumor that does not require surgical treatment. Located in the lower middle part of the back of the head, there is a small bony protuberance like a bag.

Foramen magnum hernia is a particularly critical type of cerebral hernia, which can easily lead to dysfunction of the vital center and death of the patient. Foramen magnum herniation is a pathological process in which the cerebellar tonsils are squeezed and herniated downwards, compressing the medulla oblongata, thereby causing disordered vital signs, disturbance of consciousness, and pupil changes. It is most common in infratentorial lesions.

Foramen magnum hernia is a clinical emergency that must be treated urgently once it occurs or is suspected. If breathing stops, ventricular puncture can be performed to drain the fluid, respiratory center stimulants can be given, and the cause of the disease can be treated while artificially assisting respiration.