Here is another example of polyposis with numerous small polyps covering the colonic mucosa. 息肉病，结肠黏膜覆盖有很多小息肉。
Nevertheless, in a minority of instances, cancers appear to be polyclonal and sometimes multifocal in origin, as for example multiple colonic polyposis. 然而，在少数病例肿瘤表现为多克隆性，甚至有时是多病灶起源，例如结肠多发性息肉病。
