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In radiology, the thumbprint sign, or thumbprinting, is a radiologic sign found on a radiograph that suggests the diagnosis of either epiglottitis or intestinal ischemia.
In a lateral C-spine radiograph, the sign is caused by a thickened free edge of the epiglottis, which causes it to appear more radiodensity than normal, resembling the distal thumb.
In an abdominal radiography, thumbprinting has an appearance of thumbs protruding into the intestine, and is caused by thickened circular folds.Page 111 in: Abdominal thumbprinting is a non-specific finding, though one potential cause is bowel ischemia.
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