| It is currently believed that most colorectal carcinomas start as benign adenomas that undergo malignant transformation into adenocarcinoma. |
| Diagnoses were confirmed for 51 invasive colorectal carcinomas and 12 adenomas. |
| Sebaceous cysts, fibromas, papillomas, adenomas, sarcomas, carcinomas, and melanomas also have been reported. |
| The number of patients with neoplastic lesions, adenomas, adenomas 1 cm or more in diameter and adenocarcinoma was similar in both groups. |
| These authors do not clearly state whether these 14 cases represent true malignant mixed tumors or carcinoma ex-pleomorphic adenomas. |
| In contrast to those of the large bowel, benign villous adenomas of the urinary tract are rare. |
