MESOTHELIAL CYST OF THE ADRENAL-GLAND

A case of mesothelium-lined cyst of the adrenal gland is reported. Alt hough more than 300 adrenal cysts have been reported in the literature , epithelial cell-lined cysts are rare and comprise only 9% of the cas es. An adrenal cyst was found, the lining cells of which had features consistent with mesothelial cells. The inner surface of the cyst was l ined by a single layer of cuboidal cells, which showed alcian blue pos itive cellular outline. Immunohistochemically, the lining cells were p ositively stained for keratin, epithelial membrane antigen and CA-125. Electron microscopic examination revealed many long complex microvill i and desmosomes in the lining cells. There was a basal lamina beneath the cell layer. These morphological and immunohistochemical findings indicated that the lining cell is derived from mesothelium.