(a) An adipocytic tumor was observed. The tumor cells showed appreciable anisocytosis and focal anisonucleosis without obvious pleomorphism. H + E, initial magnification 100x. (b) There were rare, sporadic cells with the morphologic appearance of a lipoblast. H + E, initial magnification 400x. (c) Several of the atypical adipocytes and lipoblasts showed immunoreactivity with p16 on immunohistochemistry, initial magnification 400x.