Temporal bone bulge

Introduction The humeral bulge is a symptom of arachnoid cyst. Arachnoid cysts are a type of benign brain cyst. There are arachnoid wall and cerebrospinal fluid-like cyst fluid. The cyst is located on the surface of the brain and is closely related to the subarachnoid space, but does not invade the brain. Mostly single, a few multiple, often located in the brain and the cerebral cistern. Larger ones can simultaneously compress brain tissue and skull, which can produce neurological symptoms and changes in the skull. Arachnoid cysts are classified into congenital and secondary. The former is the problem of occurrence, and the latter is the result of extensive adhesion of the arachnoid membrane due to trauma, inflammation and the like.

Cause

Arachnoid cysts are classified into congenital and secondary. The former is the problem of occurrence, and the latter is the result of extensive adhesion of the arachnoid membrane due to trauma, inflammation and the like. Congenital arachnoid cyst is a bag-like structure formed by the cerebrospinal fluid enclosed in the arachnoid membrane and does not communicate with the subarachnoid space. Secondary patients develop cysts in the subarachnoid space due to arachnoid adhesions, which contain cerebrospinal fluid. Occurs in the small cranial fossa, also seen in the big pool of the pillow, the brain pool around the four-fold body and the upper pool.

an examination

Related inspection

Brain Doppler Ultrasound (TCD) Brain CT examination

The following checks can be made:

1 skull X-ray: long-term compression of the cyst can produce local changes in the skull. For example, the lateral fissure type has a sphenoidal winglet that is lifted and thinned, the large wing and the sacral scale are bulged outward, the middle cranial fossa is compressed, and the sella is damaged. The cerebral facet type has asymmetric asymmetry on both sides of the top of the skull, and the local bone is thin and the bone joint is separated. The cerebellopontine angle shows the rock bone, and the inner auditory area has a round shape with smooth bone absorption. Iodine bridge angiography can show cystic shadows. Other types of skull changes are less.

2 cerebral angiography: lateral fissure shows vascular anterior and lateral fissures with or without vascular occupying changes. The cerebral facet type has a local avascular zone that is difficult to distinguish from a subdural hematoma. In the longitudinal fissure type, the A2 segment can be wrapped around the avascular region, and adjacent vessels are separated and displaced. The saddle type shows that the siphon is open, and the A1 is lifted and changed. Cerebral angiography has been less frequently applied since the application of CT scans.

3CT scan: showing local low-density area (CT value approximate cerebrospinal fluid density), the boundary is clear. There is no wall enhancement after contrast agent injection.

Differential diagnosis

Should be differentiated from the fracture of the tibia. A fracture of the tibia is part of a head injury, often caused by a car accident, impact on the occiput, and fall. Can be associated with varying degrees of intracranial or chest, abdomen and other tissue and organ damage. The most common fractures in the humerus, scaly and mastoids are due to the weaker joints between the rock and the scales, resulting in more fractures involving the middle ear than the inner ear.

The material in this site is intended to be of general informational use and is not intended to constitute medical advice, probable diagnosis, or recommended treatments.