All tumors were classified on the basis of their morphologic appearance into five types: (1) wide-based sessile lesion with gradually sloping margin and smooth surface (17 cases); (2) wide-based sessile lesion, more polypoid than the first type, with a smooth surface, with or without a central depression (49 cases); (3) wide-based sessile lesion with lobulated surface (six cases); (4) pedunculated lesion with smooth or granular surface (17 cases); (5) unclassified, not any of the previously mentioned types, may be diffusely stenotic or aneurysmal (six cases). The most common finding was the wide-based sessile lesion with a smooth surface and a possible central depression; next most common was the wide-based sessile lesion with gradually sloping margin and smooth surface; next was the pedunculated lesion with a smooth or granular surface.

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Note added at 16 hrs (2012-06-25 14:01:44 GMT)
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běžně to ‚nasedající‘ znamená, že je polyp přilehlý, a ne na ‚stonku‘
http://www.worldendo.org/assets/downloads/pdf/publications/h...