<unk> s <unk> s) are cysts that occur within choroid<unk>  of the brain. They are the most common type of intraventricular cyst. The brain contains pockets or spaces called ventricles with a spongy layer of cells and blood vessels called the choroid<unk> . This is in the middle of the fetal brain. The choroid<unk>  has the important function of producing cerebrospinal fluid. The fluid produced by the cells of the choroid<unk>  fills the ventricles and then flows around the brain and the spinal cord to provide a cushion of fluid around these structures.<unk> s can form within this structure and come from fluid trapped within this spongy layer of cells, much like a soap bubble or a blister.<unk> s are often called "soft signs" or fetal ultrasound "markers" because some studies have found a weak association between<unk> s and fetal chromosome abnormalities. It is believed that many adults have one or more tiny<unk> s. The fetal brain may create these cysts as a normal part of development. They are temporary and usually are gone by the 32nd week of pregnancy.<unk> s are a rare cause of intermittent hydrocephalus. This is caused by a blockage of foramina within the ventricular drainage system of the central nervous system (CNS), which can lead to expansion of the ventricles, compressing the brain (the cranial cavity cannot expand to accommodate the increase in fluid volume) and possibly causing damage.
Choroid plexus cyst
Choroid plexus papilloma
Choroid plexus tumor
Choroid plexus carcinoma
Choroidal fissure cyst
Paradental cyst
Subdural hygroma
Cystic hygroma