A 6-year-old Japanese boy was admitted to our hospital because of right hypochondrial discomfort, which had started 6 h earlier. His medical history was unremarkable. A physical examination revealed rebound tenderness in the right upper quadrant associated with a low-grade fever (37.4 C). Laboratory tests at presentation showed an increased white cell count of 11,700/lL (normal range 3700–8000) and C-reactive protein 2.56 mg/dL (normal range 0.00–0.29). Liver and renal function tests were normal. Conventional gray-scale transabdominal ultrasonography (US) using the ProSound a10 (Hitachi-Aloca Medical Co., Tokyo, Japan) with a 3.5-MHz transducer demonstrated an enlarged gallbladder with a grossly thickened wall, and a small amount of pericholecystic fluid (Fig. 1). The sonographic Murphy’s sign was positive. There was no evidence of gallbladder stones. Based on the conventional US, our initial diagnosis was acute cholecystitis. However, the gallbladder wall was unusually thickened for typical acute cholecystitis, so we evaluated the blood flow of the gallbladder wall. Doppler imaging confirmed the flow in the cholecystic artery at the neck of the gallbladder, but no blood flow within the gallbladder wall was observed, which was inconsistent with acute cholecystitis [2]. Therefore, CEUS using Sonazoid (Daiichi-Sankyo, Tokyo, Japan) was performed to further assess the gallbladder vascularity, since CEUS is more sensitive in detecting the blood flow than nonenhanced color Doppler US [3]. Sonazoid diluted in 10 mL of saline solution was administered intravenously at 0.015 mL/kg over 3–5 s. Five seconds after administering the Sonazoid , the gallbladder wall was enhanced from the serosal side, and then the mucosal line was enhanced linearly a second later (Figs. 2, 3). Based on a preoperative diagnosis of acute cholecystitis due to incomplete gallbladder torsion, the boy underwent an emergency laparotomy. At surgery, the gallbladder was markedly swollen and the cystic duct had twisted 180 in a counter-clockwise manner around the mesentery (Fig. 4). Y. Yashima (&) T. Tsujino R. Nakata Department of Gastroenterology, Japanese Red Cross Medical Center, 4-1-22 Hiroo, Shibuya-ku, Tokyo 150-8935, Japan e-mail: y-yashima@umin.ac.jp
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