The topic Congenital Arachnoid Cyst you are seeking is a synonym, or alternative name, or is closely related to the medical condition Primary Arachnoid Cyst.

Quick Summary:

• Arachnoid cysts are uncommon benign cysts that form between the layers of the arachnoid membranes. These fluid-filled lesions may arise anywhere in the central nervous system (CNS). The involvement of the spinal cord is infrequently noted. Arachnoid cysts are classified depending on the cause as either primary or secondary
• The meninges, which is the membranous tissue encasing the brain and spinal cord, consist of three layers, namely the outer layer (dura mater), the middle layer (arachnoid mater), and the inner layer (pia mater); together, they form the protective lining around the CNS. Arachnoid cysts are filled with cerebrospinal fluid (CSF) involving the arachnoid mater/membrane
• Primary Arachnoid Cyst is the more common form of arachnoid cyst that is present at birth (congenital origin). It forms due to developmental issues during fetal growth that involves the brain and/or spinal cord
• The exact cause of formation of a Primary Arachnoid Cyst is unknown; however, nearly 80% of these lesions are diagnosed in males. The cysts are classified according to the location they arise from within the central nervous system
• Small-sized Primary Arachnoid Cysts may not present any significant signs and symptoms. However, large cystic tumors may cause headaches, memory issues, back pain, numbness, weakness of the lower extremities, or loss of bladder/bowel control, depending on the location of the tumor within the CNS
• In some cases, the treatment of Primary Arachnoid Cysts may involve surgery. In most cases, the prognosis is good with appropriate early treatment, since it is a benign lesion. Occasionally, large cysts may result in severe complications and cognitive issues, especially if these are undetected or left untreated

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