Rare Case Report: Partial Situs Inversus with Intestinal Malrotation and Perforated Appendicitis with Generalized Peritonitis in a 65-Year-Old Male

A male patient, age 65, arrived at the emergency room of Ambo University Referral Hospital in Ambo, Ethiopia, complaining of severe, diffuse abdominal discomfort that had persisted for three days. The patient also had fever, nausea, and distension in his abdomen. After starting in the lower left quadrant, the discomfort gradually spread throughout the entire abdomen. Intestinal malrotation, usually diagnosed in infancy, which results from incomplete rotation of the midgut during embryogenesis. Adult presentation is rare and often incidental or complicated by obstruction or volvulus. It emphasizes the importance of considering congenital anatomical variants in adults with atypical abdominal pain, and the need for early imaging to guide timely surgical intervention.