TY - JOUR T1 - ANSWER JF - Gut JO - Gut SP - 1365 LP - 1365 DO - 10.1136/gut.2007.142653a VL - 57 IS - 10 A2 - , Y1 - 2008/10/01 UR - http://gut.bmj.com/content/57/10/1365.abstract N2 - From the question on page 1344The differential diagnosis of a lower right quadrant mass includes Crohn’s disease, tuberculosis and neoplasia; and, less commonly, psoas abscess, pelvic kidney, ovarian cyst and mucocele of the gallbladder. The … ER -