![]() Some scientists debate whether arachnoid cysts are a true congenite condition or if this should be separated from secondary cysts. In the cases of intracystic hemorrhage and hematoma, the individual may have symptoms of increased pressure within the cranium and signs of compression of nearby nerve (neural) tissue. If a blood vessel bleeds on the outside of a cyst, a collection of blood ( hematoma) may result. Blood vessels on the surface of a cyst may tear and bleed into the cyst (intracystic hemorrhage), increasing its size. Trauma can cause the fluid within a cyst to leak into other areas (e.g., subarachnoid space). Some complications of arachnoid cysts can occur when a cyst is damaged because of minor head trauma. There are some cases where hereditary disorders have been connected with arachnoid cysts. The exact role that temporal lobe abnormalities play in the development of middle fossa arachnoid cysts is unknown. In some cases, arachnoid cysts occurring in the middle fossa are accompanied by underdevelopment ( hypoplasia) or compression of the temporal lobe. Researchers believe that most cases of arachnoid cysts are developmental malformations that arise from the unexplained splitting or tearing of the arachnoid membrane. The exact cause of arachnoid cysts is not known. Patients with left temporal lobe cysts had mood disturbances similar to manic depression (bipolar disorder) and were known to show outward aggression.A patient with a cyst on the left middle cranial fossa had auditory hallucinations, migraine-like headaches, and periodic paranoia.Cyst on the right sylvian fissure resulted in new onset of schizophrenia-like symptoms at age 61.A left fronto-temporal cyst showed symptoms of alexithymia. Cysts on the left temporal lobe have been associated with psychosis.Frontal arachnoid cysts have been associated with depression.A supratentorial arachnoid cyst can mimic a Ménière's disease attack.In elderly patients (>80 years old) symptoms were similar to chronic subdural hematoma or normal pressure hydrocephalus:.Pre-senile dementia, a condition often associated with Alzheimer's disease.Hemiparesis (weakness or paralysis on one side of the body).Hydrocephalus (excessive accumulation of cerebrospinal fluid).The cyst was in the temporal location in 75% of these cases. A study found 18% of patients with intracranial arachnoid cysts had non-specific headaches.In a 2002 study involving 78 patients with a migraine or tension-type headache, CT scans showed abnormalities in over a third of the patients, though arachnoid cysts only accounted for 2.6% of patients in this study.A patient experiencing a headache does not necessarily have an arachnoid cyst. Cysts in the left middle cranial fossa have been associated with ADHD in a study on affected children.Cysts in the suprasellar region in children have presented as bobbing and nodding of the head called bobble-head doll syndrome.Cranial deformation or macrocephaly (enlargement of the head), particularly in children.On the other hand, a number of symptoms may result from large cysts: Symptoms vary by the size and location of the cyst(s), though small cysts usually have no symptoms and are discovered only incidentally. Therefore, while the presence of symptoms may provoke further clinical investigation, symptoms independent of further data cannot-and should not-be interpreted as evidence of a cyst's existence, size, location, or potential functional impact on the patient. Patients with arachnoid cysts may never show symptoms, even in some cases where the cyst is large. ![]()
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