The moulage sign is related to sprue, in particular coeliac disease. It occurs where the is a dilated loop of bowel with effaced folds. It is said to appear like a tube into which wax has been poured.
Moulage (French: casting/moulding) is the art of applying mock injuries to aid in the education of medical emergency teams. It was used as early as the rennaisance when wax figures were used.