Mucocoele of the Appendix

• Overdistension of the appendix with mucous 2° to luminal obstruction by fecalith or foreign body, carcinoid or endometriosis

• Very rare

• Globular, smooth-walled mass protruding into cecum

• Peripheral, rim-like calcification may occur

• Low attenuation content on CT

• May rupture and produce pseudomyxoma peritonei

• Myxoglobulosis is a rare variant of mucocoele in which there are pearly white balls of mucous mixed with other mucous in a mucocoele

• Usually asymptomatic

• May present as appendicitis

• Mass contains multiple small, rounded, nonlaminated calcified spheres

WH/93