what is a cisterna magna cyst
From Wikipedia, the free encyclopedia. The cisterna magna (or cerebellomedullary cistern) is one of three principal openings in the subarachnoid space between the arachnoid and pia mater layers of the meninges surrounding the brain. The openings are collectively referred to as cisterns.he two other principal cisterns are the pontine cistern located between the pons and the medulla, and the interpeduncular cistern located between the cerebral peduncles. Cerebral spinal fluid can also be obtained by puncture of the cisterna magna (cistern puncture).
Axial view. A pineal gland cyst is a usually benign cyst in the pineal gland, a small endocrine system gland in the brain. Historically, these fluid-filled bodies appeared on 1-4% of magnetic resonance imaging (MRI) brain scans, but were more frequent at death, seen in 21-41% of autopsies. A 2007 study by Pua et al. found a frequency of 23% in brain scans (with a mean largest inner cross-sectional diameter of 4.3 mm).