Oncocytoma and MALT Lymphoma. Oncocytoma (A, B): A, clinical appearance and B, histopathology (HE 400×) showing sheets of large granular, eosinophilic polyhedral epithelial cells (oncocytes) having small, round, benign appearing central nuclei with large nucleoli. MALT Lymphoma (C, D): C, clinical appearance and D, histopathology showing lymphoid B cells infiltrating the caruncle's surface epithelium (HE 400×).
Solari et al. Diagnostic Pathology 2009 4:29 doi:10.1186/1746-1596-4-29