Basilar skull fracture

A basilar skull fracture is a break of a bone in the base of the skull. Symptoms may include bruising behind the ears, bruising around the eyes, or blood behind the ear drum. A cerebrospinal fluid (CSF) leak occurs in about 20% of cases and may result in fluid leaking from the nose or ear. Meningitis occurs in about 14% of cases. Other complications include injuries to the cranial nerves or blood vessels. A basilar skull fracture typically requires a significant degree of trauma to occur. It is defined as a fracture of one or more of the temporal, occipital, sphenoid, frontal or ethmoid bone. Basilar skull fractures are divided into anterior fossa, middle fossa and posterior fossa fractures. Facial fractures often also occur. Diagnosis is typically by CT scan. Treatment is generally based on the extent and location of the injury to structures inside the head. Surgery may be performed to seal a CSF leak that does not stop, to relieve pressure on a cranial nerve or repair injury to a blood vessel. Prophylactic antibiotics do not provide a clinical benefit in preventing meningitis. A basilar skull fracture occurs in about 12% of people with a severe head injury. Battle's sign – bruising of the mastoid process of the temporal bone. Raccoon eyes – bruising around the eyes, i.e. "black eyes" Cerebrospinal fluid rhinorrhea Cranial nerve palsy Bleeding (sometimes profuse) from the nose and ears Hemotympanum Conductive or perceptive deafness, nystagmus, vomiting In 1–10% of patients, optic nerve entrapment occurs. The optic nerve is compressed by the broken skull bones, causing irregularities in vision. Serious cases usually result in death Basilar skull fractures include breaks in the posterior skull base or anterior skull base. The former involve the occipital bone, temporal bone, and portions of the sphenoid bone; the latter, superior portions of the sphenoid and ethmoid bones. The temporal bone fracture is encountered in 75% of all basilar skull fractures and may be longitudinal, transverse or mixed, depending on the course of the fracture line in relation to the longitudinal axis of the pyramid.