Microcystic Adenoma
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Microcystic adenomas present in the elderly as multiloculated lesions filled with clear fluid. They are also referred to as glycogen-rich or serous cystadenoma. Numerous small cysts give the cut surface a spongy appearance. The cysts are usually lined by flat or cuboidal epithelium with abundant clear cytoplasm. The cytoplasm is clear due to abundant glycogen content as proved by PAS-positivity and sensitivity to digestion by diastase. This is a benign tumor cured by excision. A malignant counterpart has been reported (serous cystadenocarcinoma).