A Gastric Calcifying Fibrous Pseudotumor Detected by Transabdominal Ultrasound after Oral Administration of an Echoic Cellulose-Based Gastrointestinal Ultrasound Contrast Agent

Abstract

We report a rare case of gastric calcifying fibrous pseudotumor detected by transabdominal ultrasound. Transabdominal ultrasound after oral administration of an echoic cellulose-based gastrointestinal ultrasound contrast agent (TUS-OCCA) has recently been suggested as a valuable initial screening tool in selected patients for gastric diseases. In our experience, the selected patients should meet all of the following criteria: 1) patients presenting with upper abdominal complaint or just wanting a health check-up; 2) patients refusing or are unable to undergo gastroscopy examinations; 3) patients with a suitable constitution and whose cardia and pylorus can both be visualized on transabdominal ultrasound before oral contrast agent administration. The patients undergoing TUS-OCCA are scanned in different body positions in order to achieve optimal imaging ([Fig. 1]): supine decubitus mainly for scanning cardia; left decubitus mainly for scanning gastric fundus; right decubitus mainly for scanning gastric body and antrum. The commercially available oral contrast agent (50 g per package) (Best; East Asia Medical Products Co, Ltd, China) is reconstituted by adding 500 ml of boiling water to form a homogeneous thin paste. This 500 ml cellulose-based gastrointestinal ultrasound contrast agent is cooled to a suitable temperature and is then administered orally to improve the distension of the stomach.