RT Journal Article SR Electronic T1 Inguinal endometriosis: a differential diagnosis of right groin swelling in women of reproductive age JF BMJ Case Reports JO BMJ Case Reports FD BMJ Publishing Group Ltd SP e229864 DO 10.1136/bcr-2019-229864 VO 12 IS 8 A1 Katie Nga Yee Fong A1 Tiffany Wing See Lau A1 Clarence Chi Chuen Mak A1 Ka Wing Lui YR 2019 UL http://casereports.bmj.com/content/12/8/e229864.abstract AB We reported a case of right inguinal endometriosis in a 41-year-old woman with unremarkable surgical and gynaecological history. She presented with right groin swelling for a month since her last menstrual period. Clinically the swelling was first diagnosed as inguinal hernia and later histologically proven to be endometriosis.