Can occur in any organ and within most structures in the body.

Less common in the spleen than in other solid abdominal organs such as the liver or kidney.

80% of splenic cysts are false cysts that are lined by fibrous tissue but lack an epithelial lining.

Splenic pseudocysts usually result from infection, infarction or trauma and I thought to be related to prior intraparenchymal hemorrhage.

Cyst have an endothelial or epithelial cell lining.

Pseudocysts do not have endothelial or epithelial linings.

Usually contain simple fluid, but can be complicated by hemorrhage and debris.

The most common liver lesion with prevalence increasing with age.

More than 50% of adults over age 56 are likely to have at least one liver cyst.

Liver cysts usually have less than 2 mm internal sepptations or thin calcifications, but do not have other solid components.

Fluid composition of cysts result in lower attenuation on CT scans and brighter on fluid sensitive sequences on MRI and other benign or metastatic hypodense lesions.

When cysts have thickened walls or septations, enhancement, calcifications, or solid components other than a simple cyst is present, such as cystic metastases or infections such as a pyogenic abscess or hydatid cyst.

Epididymal cyst are frequent incidental findings seen in 20 – 40% of asymptomatic males, with 29% having more than one cyst.

Epididymal cysts are congenital in origin, possibly related to maturation of the mesonephric ductal system.

Epididymal cyst can be palpable and symptomatic.

Epididymal cyst are completely benign and are often difficult to differentiate from spermatoceles.

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