Esophageal superficial adenosquamous carcinoma resected by endoscopic submucosal dissection: A rare case report

Figure 4 Immunohistological findings of the lesion. A and B: The ductal structures were positive for CDX2 and negative for P40; C: The muscularis mucosa was positive for desmin, confirming that the deepest part of the carcinoma was limited within the muscularis mucosa; D: CD31 staining revealed the distribution of vessels, showing dilated and tortuous vessels around and within the ductal-structure-forming cancer cell nests.