1　胃癌的基本ＣＴ征象胃壁增厚 :癌肿沿胃壁浸润造成胃壁增厚 ,主要是癌肿沿胃壁深层浸润所致 (图 1)。腔内肿块 :癌肿向胃腔内生长 ,形成突向胃腔内的肿块。肿块可为孤立的隆起 ,也可为增厚的胃壁向胃腔内明显突出的一部分 (图 2 )。溃疡 :溃疡形成的凹陷边缘不规则 ,底部多 1 The basic CT signs of gastric cancer are thickening of the stomach: cancer walls infiltrate along the stomach wall and cause thickening of the stomach wall, mainly due to deep infiltration of the cancer along the stomach wall (Figure 1). Intraluminal mass: The cancer grows into the stomach cavity and forms a lump that protrudes into the stomach cavity. The lump can be an isolated bulge or a portion of the thickened stomach wall that protrudes prominently into the stomach cavity (Figure 2). Ulcers: Irregular rims formed by ulcers, mostly at the bottom