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Pseudoglandular myxoid adenoma of the adrenal gland.

Myxoid tumors of the adrenal cortex are rare. To the best of our knowledge, only 17 cases have been reported to date, including 10 carcinomas and 7 adenomas. The myxoid areas of these tumors are often evident grossly, and their extent is variable. We report on a case of a myxoid adenoma of the right adrenal gland in a 45-year-old male with a prominent pseudoglandular arrangement in more than 90% of the tumor mass, and with a minor component represented by anastomosing cords of tumor cells floating in pools of myxoid material. In addition, after extensive examination, we found foci of typical adrenocortical adenoma. Grossly, the tumor was yellowish without discernable gelatinous changes. Most of the tumor cells had a moderate amount of clear vacuolated cytoplasm and contained numerous oil-red-O-positive lipid droplets. Extracellularly, in the lumens of pseudoglands and on the background, we noticed myxoid material that stained positively with Alcian blue (pH 2.5) and weakly positively with mucicarmine and the PAS method. Immunohistochemical examination showed positivity of the tumor cells for vimentin and cytokeratin CAM5.2. Synaptophysin was weakly positive only focally. Cytokeratin AE1/AE3, EMA, and CEA were negative.