PMC9424671_01
A right anterior oblique projection from the GI series, showing accumulation of contrast medium into a dilated antrum (shoulder sign) and a narrow string-like pyloric channel (string sign).
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F1
An upper GI series (Figure 1) revealed an accumulation of contrast medium in the dilated gastric antrum (shoulder sign), a narrow string-like pyloric channel (string sign), and delayed gastric emptying, with only a modest amount of contrast medium passing through pylorus over the next 60 min.
Pre-operative abdominal MRI. (A) Axial TSE-T2w, (B) axial GRE-T1w, and (C) coronal turbo-spin echo T2w FAT-SAT sequences are shown, all demonstrating a thickened and narrowed pylorus (arrow), without a visible lumen.
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F2
These measurements were later confirmed by an abdominal MRI (Figure 2).