Expectoration in the gastrointestinal tract. A diagnostic problem in In-111 granulocyte scintigraphy.

Scintigraphic detection of infectious foci with In-111 labeled granulocytes or leukocytes is a well-established technique in nuclear medicine. The technique is commonly used to demonstrate inflammatory activity in Crohn's disease and ulcerative colitis. Its application, however, may be influenced by infectious expectoration located within the gastrointestinal tract. In performing this technique, it is important to have this differential diagnostic possibility in mind; it can be clarified by repeated imaging.