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Fig. 2D —Addition of decubitus view because of inadequate sigmoid distention
with supine and prone positioning in 53-year-old woman. Prone scout radiograph
does not show area of focal collapse, in part because presence of overlapping
loops makes assessment difficult. Finding on scout image can lead to both
overestimation and underestimation of distention and necessitates online
review of 2D transverse images by CT technologist or radiologist for confident
assessment of left colonic distention.
