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A 59-year-old woman with bloating and flatulence for 6 months visited to our hospital. Her symptoms did not improve after treatment with antiflatulents, prokinetics and probiotics. A plain abdominal radiograph showed a moderate amount of intestinal gas (Fig. 1A). The intestinal gas volume was measured in the plain radiograph using the imaging software Image-pro Plus® (Media Cybernetics Inc, Bethesda, MD, USA).1 To standardize the quantity of intestinal gas, the ratio of the quantity of intestinal gas to the pixel value in the region surrounded by a horizontal line tangential to the suprasymphyseal margin, a horizontal line tangential to the uppermost point of the diaphragm, and the lateralmost lines tangential to the right and left costal arches was defined as the gas volume score.2,3 The gas volume score was calculated at 0.131 (Fig. 1B). Since the other medications had not been effective for the bloating, an antibiotics (metronidazole) was started to treat possible intestinal bacterial overgrowth (however, generally rifaximin is used for intestinal bacterial overgrowth). After 2 weeks, her symptoms had disappeared. When the gas volume score was measured in a follow-up plain abdominal radiograph, the amount of intestinal gas in the plain abdominal radiograph had decreased (Fig. 1C) and the gas volume score was lower at 0.049 (Fig. 1D).    Figure 1  The plain abdominal radiograph shows a moderate amount of intestinal gas (A), which has decreased after treatment with an antibiotic (C). The gas volume score (GVS) is measured in the plain abdominal radiograph using imaging software (B, D). The black ...    The amount of intestinal gas in plain abdominal radiographs may be correlated with bloating symptoms. Moreover measuring the intestinal gas volume might be more useful when combined with a breath test for intestinal bacterial overgrowth.

A 59-Year-Old Female Presenting With Bloating and Flatulence: Is the Intestinal Gas Volume in Plain Abdominal Radiographs Correlated With Symptoms?