PMC2800006_01
Upper gastrointestinal endoscopic finding. A 10 mm sized hemispheric shaped elevated lesion with central erosion on the lesser curvature side of the distal antrum near the pylorus.
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F1
Central erosion was noticed on the surface of the lesion due to previous biopsy (Fig. 1).
Colonoscopic finding. It shows a large round mass on the cecal end with positive tent sign.
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F2
This lesion revealed positive tent sign suggesting a cystic change (Fig. 2).
Microscopic finding. In low power view, this mass-like lesion is consists of a localized area of hypertrophic circular muscle (H&E stain, x12.5).
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F3
Histological section revealed marked hypertrophy of the distal circular pyloric musculature without an evidence of neoplasia (Fig. 3).
Gross finding. Abundant mucoid material is present within the lumen of the appendix.
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F4
Appendiceal mass was diagnosed as mucinous cystadenoma after the surgical resection (Fig. 4).