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Small Flat Umbilicated Tumors of the Colon

Radiographic and Pathologic Findings

¹ Department of Radiology, University of Pennsylvania Medical Center, MRI Bldg. 1, 3400 Spruce St., Philadelphia, PA 19104.
² Department of Pathology and Laboratory Medicine, University of Pennsylvania Medical Center, Philadelphia, PA 19104.

OBJECTIVE. We describe the radiographic and pathologic findings of small flat umbilicated tumors of the colon detected on double-contrast barium enema examinations performed in a Western population.

CONCLUSION. Unlike those reported by Japanese authors, the small flat umbilicated tumors of the colon in our patients were usually hyperplastic polyps, previously called "inverted hyperplastic polyps." Nevertheless, colonoscopy with excisional biopsy is warranted for such tumors detected on double-contrast barium enema examinations because of the small possibility that these tumors represent adenoma or even early adenocarcinoma.

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