[Radiological differential diagnosis of early colorectal cancer]

Radiological differential diagnosis of early colorectal cancer was described in terms of a set of lesions which are macroscopically similar to early cancer and are present in the continuum of atypicality (adenoma-early cancer-advanced cancer), and those which are macroscopically similar to early cancer, but are not present in the continuum of atypicality (malignant lymphoma, rectal carcinoid). The majority of early colorectal cancers are polypoid lesions. They are classified into three forms; pedunuculated, sessile without central depression, and sessile with central depression. Sessile lesions without central depression which are in 1 cm level are most probably early cancers.