Figure 3.
Rigid, punched-out, intercellular spaces are visible on (A) Diff-Quik–stained and (B) Papanicolaou-stained smears and give a vaguely cribriform appearance to cell clusters. (C) Identical punched-out spaces are observed in this resected oncocytic intraductal papillary mucinous neoplasm composed of complex, branching, edematous papillae lined by oncocytic epithelium (H&E stain). (D) Intracytoplasmic pink mucin is observed in occasional tumor cells, as highlighted in the inset (Papanicolaou stain).