Fig. 8

Submucosally invasive adenocarcinoma of esophagus (pT1b) with a tongue of adenocarcinoma (arrow) abutting the resection margin (a). Measurement of the depth from the outermost extent of the deep-muscularis mucosa (b). Neoplastic glands noted very close to submucosa but separated by a thin strip of depleted outer muscularis mucosa (c, arrows, i.e., pT1a, m4).