Appendiceal mucocele

What is an appendiceal mucocele?

Chronic cystic dilation of the appendiceal lumen by mucin accumulation.

What do appendiceal mucoceles correspond to on pathology?

Focal or diffuse mucosal hyperplasia, mucinous cystadenoma, or mucinous cystadenocarcinoma.

What are the cross sectional imaging findings of an appendiceal mucocele?

On CT and MRI, appendiceal mucoceles present as well-defined cystic masses in the right lower quadrant with near water attenuation/signal intensity and curvilinear calcifications (seen only on CT). The presence of thickened nodular walls, irregular serosal contours, or nodular enhancing components should raise suspicion for mucinous cystadenocarcinoma.

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