Fig. 1

a-d A 67-year-old male pathologically diagnosed with PGC. a, b Polygonal regions of interest (ROIs) were manually drawn along the margin of the tumor on the largest cross-section based on the CT images of arterial and venous phases. c Texture parameters were extracted from the polygonal ROIs. d Haematoxylin and eosin (H&E) staining of the postoperative specimen (original magnification, × 100). The tumor was characterized by finger-like projections of tissues supported by central fibrovascular cores and was confirmed as PGC. e–h A 64-year-old male pathologically diagnosed with TAC. e, f Polygonal regions of interest (ROIs) were manually drawn along the margin of the tumor on the largest cross-section based on the CT images of arterial and venous phases. g Texture parameters were extracted from the polygonal ROIs. h H&E staining of the postoperative specimen (original magnification, × 100). The tumor showed dilated or slit-like branching tubules and was confirmed as TAC. CT, computed tomography; PGC, papillary gastric adenocarcinoma; TAC, tubular adenocarcinoma