“…Symptoms and signs of AA may be caused not only by the inflammation of the appendix but also by rare appendiceal neoplasms [14] . The main differential diagnosis of typical AA includes Crohn ileitis, mesenteric adenitis, right-sided colitis, intestinal perforation or obstruction [15] , [16] , incarcerated or strangulated hernia, regional enteritis, Meckel's diverticulitis, epiploic appendagitis, abdominal aortic aneurysm, mesenteric ischemia, renal colic, psoas abscess, testicular or ovarian torsion, ruptured ovarian cyst, ectopic pregnancy and pelvic inflammatory disease. SHAA, generally presenting with right upper abdominal pain, may be clinically indistinguishable from acute cholecystitis, liver abscess, perforated duodenal ulcer.…”