Basilar skull fracture
If there is a fracture or break in the cranial or skull bones, it is called a skull fracture. When the base of the skull is involved in a head injury, it is a basilar skull fracture or basal skull fracture. It is also known as depressed skull fracture and linear skull fracture. This linear fracture is rare and occurs in only 4% of patients with severe head injury. Falls, injuries caused by penetrating external objects like knives, hammers or axe or gunshot wounds may result in skull fractures. It can also occur when the skull hits a solid object with considerable force. Basilar skull fracture can be called a linear fracture at the base of the skull. Usually, dural tear is associated with this type of fracture. This fracture occurs at specific points on the skull base. While analyzing skull fractures, it is seen that 19-221% of all skull fractures happen to be basilar skull fractures.
There may be a traumatic brain injury when the skull is fractured. The area of the brain injured and the severity of injury is diagnosed by examining the fracture. If bacteria enter inside the skull through this fracture of the skull, it will lead to infection. Sudden blow to the back of the head can also result in a basilar skull fracture.
After a head injury, if there is a leak of a clear fluid from the nose or ears, it indicates that the clear fluid is cerebrospinal fluid (CSF) that surrounds the brain. CSF drains out through the ears or nose, when the skull is fractured and the Meninges or the covering of the brain is torn. The typical nasal drainage due to allergies, cold or crying is different from this drainage of CSF. It is also an indication of a fracture of the frontal bone or the base of the skull i.e. sphenoid or temporal bone or of the ethmoid bones (bones that support the nose and sinuses).
If bleeding from the ears or nose is not due to a cut or a direct blow, it may be an indication of a fracture of the base of the skull. Determine the cause of the bleeding by washing the blood thoroughly and see if the bleeding is from a cut or not. Ascertain the source of bleeding from the ear. It is an indication of a skull fracture if a nose bleed does not stop with home treatment. If bruising or dislocation develops within 24 hours after a head injury, it also indicates a basilar skull fracture. Often bleeding within the skull may occur with a basilar skull fracture. This condition may lead to infection.
Diagnosis is made with laboratory check of the clear dripping fluid for the presence of CSF. A CT scan of the head with the focus on bones can reveal the extent of damage to the bones. CSF otorrhea and bruising over the mastoids commonly known as 'battle sign' is an indication of a fracture of the petrous temporal bone. Rhinorrhea and bruising around the eyes (raccoon eyes) are noticed with anterior cranial fossa fractures. Depending on an associated intracranial pathologic condition, the Glasgow Coma Score and loss of consciousness may differ from patient to patient. Temporary deafness is a possibility but it resolves in about three weeks.
Hemotympanum and mucosal edema in the middle ear fossa cause this temporary hearing loss. Basilar skull fractures sometimes leads to meningitis in some patients. If the bones around the foramen magnum are broken, there is a risk of damage to the blood vessels and nerves exiting the hole.
Bibliography / Reference
Collection of Pages - Last revised Date: February 20, 2019