鯨岡 結賀¹, 丸山 常彦², 鮨狗伐 幸久³

Yuka KUJIRAOKA¹, Tsunehiko MARUYAMA², Yukihisa SAIDA³

¹筑波記念病院放射線科, ²筑波記念病院外科, ³筑波大学臨床医学系放射線科

¹Department of Radiology, Tsukuba Memorial Hospital, ²Department of Surgery, Tsukuba Memorial Hospital, ³Institute of Clinical Medicine, University of Tsukuba

キーワード : mucinous adenocarcinoma of the colon, pseudokidney sign, ultrasonography

The patient was a 74-year-old woman complaining of pain in the lower right abdomen. Ultrasonography showed a hypoechoic mass with an echogenic core in front of the right kidney, suggestive of pseudokidney sign, a term originally used for bowel tumors, intussusception, and some inflammatory conditions. Most of these entities involve thickening of the bowel wall and appear as a hypoechoic rim. In our case, several strand echoes spread out from the echogenic core to the hypoechoic rim. The CT and pathological findings showed the hypoechoic rim to correspond to collection of mucin, the echogenic core, and to nodular tumors and feces. The spreading strand echoes could represent connective tissue within the subserosal space or adjacent to the outer bowel wall.