Foregut duplication cysts: A report of two cases with emphasis on embryogenesis

Figure 1 A computed tomography scan of the abdomen and pelvis was performed utilizing intravenous and oral contrast. A 4 cm × 5 cm cystic mass (arrow) appears along the greater curvature of the stomach adjacent to the spleen.

Figure 2 Retroflexed endoscopic view of a gastric mass arising in the fundus (arrow). Overlying rugae are effaced, suggestive of a submucosal process.

Figure 3 Case 1. A: Hematoxylin and eosin satin of gastric/ciliated epithelium (4 ×); B: High power view of the ciliated epithelium (40 ×); C: CK20 showing staining in the surface gastric epithelium, but not in the ciliated epithelium (10 ×); D: MUC5a/c staining showing positive expression in the gastric epithelium but not in the ciliated epithelium (10 ×); E: Thyroid transcription factor-1 nuclear staining in the ciliated epithelium only (10 ×); F: Surfactant staining in the ciliated epithelium only (10 ×).

Figure 4 Case 2. Computed tomography-scan of the abdomen and pelvis with intravenous and oral contrast showing a non-enhancing cystic structure (arrow) abutting the lesser curvature of the stomach and liver along the ligamentum venosum.

Figure 5 Case 2. A, B: Hematoxylin and eosin staining of pseudostratified ciliated epithelium (A: 4 ×, B: 40 ×); C: Thyroid transcription factor-1 nuclear staining in the ciliated epithelium (10 ×); D: Surfactant staining in the ciliated epithelium (10 ×).