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Appendicular mucocele (AM) is a rare and potentially malignant entity linked to obstructive dilatation of the appendix with an intraluminal accumulation of mucoid material. Most AM is asymptomatic or simulates acute appendicitis. We report an exceptional case of AM discovered in the face of hypokalemia and aggravation of chronic kidney disease (CKD) without diarrhea in an old man. Investigations led to the diagnosis of AM in its malignant form complicated by gelatinous ascites. We retained mucinous hypersecretion as the cause of hypokalemia and acute renal failure. Aggressive surgery and intraperitoneal chemotherapy corrected hydroelectrolyte imbalance.