PMC5635238_01
a. Low Grade Appendiceal Mucinous Neoplasm (LAMN), High Power Field. b. Low Grade Appendiceal Mucinous Neoplasm (LAMN), Low Power Field. a and b: LAMN - Sections of the mucinous cystic lesion reveal a mildly undulating epithelium, lacking underlying lamina propria, resting atop an attenuated fibrous stroma. Scattered papillary type tufting can be appreciated. Single cells overlap minimally, contain low grade slightly elongated nuclei, and abundant mucin-filled cytoplasm. Extravasated mucin can be seen within the appendiceal lumen.
gr1.jpg
PMC5635238_01_gr1.jpg
fig0005
The final pathology report revealed a low-grade appendiceal mucinous neoplasm (LAMN) without presence of invasion or dissecting mucin, as well as a 1.1 cm well differentiated grade 1 neuroendocrine tumor ("carcinoid") at the distal tip of the specimen(Fig. 1).