Appendix Leiomyoma

A well-circumscribed benign smooth muscle neoplasm arising from the appendix. It is characterized by the presence of spindle cells with cigar-shaped nuclei, interlacing fascicles, and a whorled pattern. (NCI Thesaurus)

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Appendix Large Cell Neuroendocrine Carcinoma

An aggressive, high-grade and poorly differentiated carcinoma with neuroendocrine differentiation that arises from the appendix. It is characterized by the presence…

Appendix L-Cell Glucagon-Like Peptide-Producing Neuroendocrine Tumor

A neuroendocrine tumor arising from the wall of the appendix, producing glucagon-like peptides. Morphologically, it is characterized by the presence of…

Appendix Kaposi Sarcoma

A rare Kaposi sarcoma that arises from the appendiceal wall.

Appendix Intraepithelial Neoplasia

A precancerous intraepithelial neoplastic lesion that affects the appendix. It is characterized by low or high grade dysplasia of the mucosal…

Appendix Hyperplastic Polyp

A non-neoplastic polyp that arises from the appendix. It is characterized by the presence of elongated serrated crypts and the absence…

Appendix High Grade Intraepithelial Neoplasia

A precancerous intraepithelial neoplastic lesion that affects the appendix. It is characterized by the presence of moderate or severe dysplasia and…