Figure 3.

PET/MRI images of T staging. All the patients are corresponding to Figure 1. (a) A 58-year-old man with gastric carcinoma pathologically diagnosed as stage T1. Transverse T2W image shows focal thickening of the gastric wall at the lesser curvature of the stomach, the tumor of low signal intensity confined within the mucosa and submucosa, and the high signal intensity stripe of submucosa appears to be continuous (arrow). (b) A 46-year-old woman with gastric carcinoma pathologically diagnosed as stage T2. Transverse T2W image shows focal thickening of the gastric wall in the cardia with a smooth and well-defined outer border, the tumor of heterogeneous signal intensity involving the muscularis propria, and disruption of the high signal intensity stripe of submucosa (arrow). (c) A 70-year-old man with gastric carcinoma pathologically diagnosed as stage T3. Transverse T2W image shows focal thickening of the gastric wall in the antrum; the whole thickened gastric wall is infiltrated by the low signal intensity of tumor tissues with a smooth and well-defined outer border (arrow). (d) A 74-year-old man with gastric carcinoma pathologically diagnosed as stage T4. Transverse T2W image shows an irregular thickened gastric wall in the cardia and fundus; the whole thickened gastric wall with an irregular outer border is infiltrated by the low signal intensity of tumor tissues and transmural extension into perigastric fat (arrow).