Endoscopic visualization of an inverted appendix

Inverted appendix in an asymptomatic patient without intussusception or previous appendectomy

“…Thirdly, as in our case, patients with inverted appendix may be encountered without a history of previous appendectomy or clinical symptoms of intussusception. Patients belonging to this category may have colonoscopic findings of a polypoid lesion without prominent inflammation [4,5]. Regarding the aetiological cause of the appendiceal inversion in this category, little evidence can be obtained because of limited case reports in current literature.…”

“…It has been reported in patients who have appendiceal intussusception [1] or those who had undergone previous appendectomy [2,3]. However, few cases of inverted appendix have been reported without previous history of appendectomy or endoscopic findings of necrosis or inflammation [4,5].…”

Evaluation of Subepithelial Abnormalities of the Appendix by Endoscopic Ultrasound

“…An inverted appendiceal orifice—a nonpathologic finding—was seen in one patient in the series. This has been previously described by both virtual and standard colonoscopy [ 16 , 17 ]. Appendiceal intussusception has also been diagnosed with endoscopic ultrasonography based upon the multiconcentric appearance [ 18 ].…”

Serrated Adenoma of the Inverted Vermiform Appendix Showing a Gigantic Pedunculated Polyp-Like Appearance

“…Probably, colon peristalsis drew the polyp on the inverted appendix, forming a large pedunculated polyp‐like mass. Inverted appendix often looks like a pedunculated polyp 1,2 . Remnant appendiceal stump also sometimes presents as a polypoid lesion after inversion‐ligation appendectomy 3 .…”