Gross morphology<unk> s are typically round, well-demarcated, measuring 2–17 cm in diameter (average 8 cm), with<unk>  and cystic areas with hemorrhage on cut sections. Histomorphology<unk> s consist of<unk>  sheets of cells that are focally dyscohesive. The cells in the lesion usually have uniform nuclei with occasional nuclear grooves, eosinophilic or clear cytoplasm and PAS positive eosinophilic intracytoplasmic globules. Necrosis is usually present and, as cell death preferentially occurs distant from blood vessels, lead to the formation of pseudopapillae. Immunohistochemistry<unk> s show positive nuclear staining for beta catenin, as well as positive immunostaining for CD10, CD56, vimentin, alpha 1-antitrypsin, and neuron specific enolase; they are negative for chromogranin and pancreatic enzymes.
Solid pseudopapillary tumour
Papillary tumor
Adenomatoid tumor
Angiolipoma
Perivascular epithelioid cell tumour
Oncocytoma
Mucinous cystadenoma
Angiomyolipoma