Defect of filling non-constant (false) comes to light during roentgenoscopy and on roentgenograms at compact filling by a contrast agent of a stomach, happens non-constant (false). Defects of filling of a stomach non-constant meet single and multiple, pl can be displaced to be motionless, to have equal contours. The size and their form are various. One of the main signs of defect of filling of a stomach is its disappearance at control research. Extreme mobility of defect from pyloric part to the arch of a stomach and in the opposite direction also demonstrates that morphological substrate of defect of filling of a stomach false are the remains of the eaten food, foreign bodys, slime, fat lumps, hair, clots (phyto - trikho-, lipobezoar), etc. Are distinguished at roentgenoscopy and a X-ray analysis with use of a contrast agent in various projections in vertical and horizontal position at a double contrast study and obligatory control X-ray inspection.