The human stomach is the organ of the gastrointestinal tract located in the left upper quadrant of the abdomen. Its prime role is to accommodate and digest food. The shape of the stomach is greatly modified by changes within itself and in the surrounding viscera such that no one form can be described as typical. The existing classification of anatomical variants of the human stomach is based on radiological data. Four main types are proposed: J-shaped, hourglass (fish-hook), steer-horn and cascade (Fig. 1.1). The chief configurations under normal physiological conditions are determined by the amount of the contents, the stage of the digestive process, the degree of development of the gastric musculature, the condition of the adjacent organs, the loops of the small and large intestines, body habitus, sex and age .The human stomach is more or less concave on its right side and convex on its left. The concave border is called the lesser curvature; the convex border, the greater curvature. The region that connects the lower esophagus with the upper part of the organ is called the cardia. The uppermost adjacent part to it is the fundus. The fundus adapts to the varying volume of ingested food and frequently contains a gas bubble, especially after a meal. The largest part of the stomach is known simply as the body (corpus). The antrum, the lowermost part, is usually funnel-shaped, with its narrow end connecting with the pyloric region. The latter empties into the duodenum, the upper division of the small intestine. The pyloric portion tends to curve to the right, slightly upward and backward.