Figure 5.
Papillary in-situ carcinoma in mucinous cystic neoplasm. (a) The neoplastic epithelium contains abundant intraepithelial neutrophils with focal microabscess formation (hematoxylin and eosin stain, magnification ×400). (b) Note MUC1 expression on the apices of the papillae (magnification ×200).