intraarachnoid cyst
Introduction
Introduction 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. A congenital arachnoid cyst is a bag-like structure formed by the cerebrospinal fluid enclosed in the arachnoid membrane. 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.
Cause
Cause
More results from trauma, inflammation and other arachnoid extensive adhesions.
Examine
an examination
Clinical manifestations are similar to intracranial lesions. Some patients may have convulsions or seizures. There may also be local symptoms such as eyeball protrusion and head disregard.
Imaging findings: a clear, smooth cerebrospinal fluid density zone with a CT value of 0-20 Hu, with no enhanced performance. The lateral fissure pool and the cyst near the cranial sac are characterized by a linear shape on the inner edge, which can be square. Often causing absorption and bulging of adjacent skulls. The arachnoid cyst of the occipital cistern can shift the anterior chamber of the fourth ventricle, with the enlargement of the ventricles above the lesion.
Diagnosis
Differential diagnosis
Spider arachnoid adhesion: a major feature of arachnoiditis. Arachnoiditis refers to a tissue reaction of the arachnoid membrane of the brain or spinal cord under the influence of certain etiologies. The arachnoid thickening, adhesion and cyst formation are Main features.
Arachnoid thickening: Arachnoiditis refers to a tissue reaction of the arachnoid membrane of the brain or spinal cord under the influence of certain etiologies, characterized by arachnoid thickening, adhesion and cyst formation. In essence, this is a pathological diagnosis, not a disease unit, more common in young and middle-aged.
Subarachnoid hemorrhage: Most patients are conscious, such as dysfunction, or coma - awake - coma should consider continuing bleeding. Such as coma with respiratory frequency is not complete, high fever, is the symptoms of brain stem bleeding.
Clinical manifestations are similar to intracranial lesions. Some patients may have convulsions or seizures. There may also be local symptoms such as eyeball protrusion and head disregard.
Imaging findings: a clear, smooth cerebrospinal fluid density zone with a CT value of 0-20 Hu, with no enhanced performance. The lateral fissure pool and the cyst near the cranial sac are characterized by a linear shape on the inner edge, which can be square. Often causing absorption and bulging of adjacent skulls. The arachnoid cyst of the occipital cistern can shift the anterior chamber of the fourth ventricle, with the enlargement of the ventricles above the lesion.
