Esophageal early basaloid squamous carcinoma with unusual narrowband imaging magnified endoscopy findings

Figure 5 Hyperchromatic tumor cells. A: Histologically, basal cell-like hyperchromatic tumor cells proliferated mainly in the lamina propria; B: Immunostaining with desmin suggested that the tumor invaded the submucosa at a depth of 320 μm; C: The tumor cells formed solid nests and microcystic structures; D: The microcystic structures contained an Alcian blue-positive mucoid matrix; E: Immunostaining for α-SMA was negative; F: Thin vessels (arrowheads) were observed in the intra-epithelial papilla, and thick vessels (arrows) were observed around the solid nests just below the epithelium.