[Differential diagnosis of the early cancer: imaging diagnosis "CT"].

Computed tomography (CT) makes a significant contribution to the care of the patient with cancer, and is still expanding its usage in the diagnosis of the tumor. CT is considered to be an essential tool for the cancer of the pharynx and larynx, lung, liver, biliary tract, pancreas, kidney, adrenal gland, and ovary. We briefly describe the CT anatomy and oncologic pathology in these regions.