How can you tell the difference between arachnoid cyst and mega cisterna magna?

Differential diagnosis Mega cisterna magna needs to be distinguished from other causes of an enlarged retrocerebellar CSF space: arachnoid cyst: can be difficult to distinguish from a mega cisterna magna. epidermoid cyst: often shows a heterogeneous/dirty signal on FLAIR and restricted diffusion.

What are the symptoms of mega cisterna magna?

2) Delayed development, seizure, hyperactivity, headache, microcephaly in order of frequency were the chief complaints on admission. Neurologic examination was abnormal in 2 children, but all of the children did not related to the symptoms of mass effect in the posterior fossa.

Where is cisterna magna located?

medulla oblongata
The cisterna magna is located between the cerebellum and the dorsal surface of the medulla oblongata. Cerebrospinal fluid produced in the fourth ventricle drains into the cisterna magna via the lateral apertures and median aperture.

Can arachnoid cysts cause headaches?

Some arachnoid cysts never present a problem, but others can cause symptoms by putting pressure on the brain. Depending on the size and location of the arachnoid cyst, symptoms can include: Headache. Nausea and vomiting.

What is considered a large arachnoid cyst?

The size of arachnoid cysts varies. The average arachnoid cyst size is less than 3 cm. An arachnoid cyst size of 3 cm or greater is considered dangerous. If your cyst is in a potentially dangerous location, has enough size and is causing symptoms, minimally-invasive surgery may be an option.

How do you treat mega cisterna magna?

The Young Mania Rating Scale (YMRS)13 was performed before and after the treatment. Magnetic resonance imaging midsagital and transverse scans: mega-cisterna magna. Olanzapine treatment was started at a dosage of 20 mg/day on the first day of the admission to hospital and increased to 30 mg/day on the 13th day.

What causes mega cisterna magna?

Causes of an enlarged cisterna magna include cerebellar hypoplasia, communicating hydrocephalus, and normal variation. Cerebellar hypoplasia is a frequent finding in the trisomies and therefore a careful search should be made for associated cardiac anomalies, growth retardation, and polyhydramnios.

What is the cisterna magna responsible for?

The cisterna magna is located between the cerebellum and the dorsal surface of the medulla oblongata. Cerebrospinal fluid produced in the fourth ventricle drains into the cisterna magna via the lateral apertures and median aperture.

What is Fetal cisterna magna?

The cisterna magna (CM) [1] or cerebellomedullary cistern is a subarachnoid space that lies between the caudal aspect of the cerebellum and the medulla oblongata draining the fourth ventricle.

Can you live with an arachnoid cyst?

Most arachnoid cysts are stable and do not require treatment. They are four times more common in boys than in girls. Arachnoid cysts are diagnosed with a CT or MRI scan. Treatment, if necessary, involves draining the fluid through surgery or shunting.