NICHE — radiological sign of an ulceration of a wall of a gullet, stomach or gut.
On N.'s roentgenogram can have an appearance of a limited ledge on a contour of the body filled with a contrast agent — so-called profile N. (fig. 1) or a resistant spot on the image of a relief — an inner surface of body — a so-called niche of a relief (fig. 2).
The N can be found at rentgenol, a research on an occasion of many diseases went. - kish. a path, followed by its ulceration, napr, peptic ulcer, colitis, cancer, sarcoma, syphilis, etc. In some cases, napr if ulcer defect is filled with the food, necrotic masses or slime, is covered with an edematous mucous membrane, etc., N. can not be defined.
In differential diagnosis the signs characterizing as directly N., and a condition of sites of body, adjacent to it (see are of great importance additional rentgenol. Stomach, table ).
Bibliography: Vlasov P. V. Clinicoradiological semiotics of a carcinoma of the stomach, page 96, M., 1974; Geselevich E. S. Radiodiagnosis of diseases of a large intestine, M., 1968; Zedge-n and d z E. And. and Lindenbraten JI. D. Urgent radiodiagnosis, JI., 1957; Kagan E. M. Radiodiagnosis of diseases of a gullet, with 87, M., 1968; Kicherman A. P. and Salita X. M. Radiodiagnosis of diseases of antral department of a stomach, page 72, etc., Chisinau, 1976, bibliogr.; Fanardzhyan V. A. Radiodiagnosis, page 339, Yerevan, 1977.
V. V. Kitayev.