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What is Thumb print sign is seen in and explain in detail?
Thumb printing: Indentation in contrast or air-filled bowel lumen caused by sub mucosal infiltration and resembling a thumb printing; e.g. Ischemia Thumbprinting is a Radiographic sign of large bowelwall thickening, usually caused by edema, related to an infective or inflammatory process ('colitis'). The normal haustra become thickened at regular intervals appearing like 'thumb-prints' projecting into the aerated lumen.