The selection of oral contrast agent and optimization of bowel preparation for oncologic CT could help avoid potentially severe clinical consequences of missed malignant deposits, according to a study published in the American Journal of Roentgenology.
“CT has suboptimal NPV for malignant deposits in intraabdominal nonsolid organs,” wrote corresponding author Benjamin M. Yeh of the University of California, San Francisco. “Compared to neutral material, positive oral contrast material improves detection, particularly with adequate bowel filling.”
Yeh and team’s retrospective study included 265 patients (133 men, 132 women; median age, 61 years) who underwent an abdominopelvic CT examination where the report did not suggest presence of malignant deposits and subsequent CT examination within 6 months where the report indicated at least one unequivocal malignant deposit. Examinations used positive (iohexol; n=100) or neutral (water; n=165) oral agents. While reviewing images to assess visibility of deposits, a board-certified abdominal radiologist also assessed adequacy of bowel filling with oral contrast material.
NPV of CT for detection of malignant deposits in intraabdominal nonsolid organs was 65.8% for examinations using positive oral contrast material with adequate bowel filling, 45.2% for positive oral contrast material with inadequate bowel filling (p=.07), and 35.2% for neutral oral contrast material regardless of adequacy of bowel filling (p=.002).
“Results may differ when studying other types of contrast material regimens,” the authors noted, including barium-based, hyperosmolar iodine, sugar-alcohol neutral, or experimental dark oral agents.Back To Top
Positive Oral Contrast With Optimized Bowel Prep Improves Detection of Malignancy on CT. Appl Radiol.