[Current imaging for rectal cancer]. / Aktuelle Bildgebung beim Rektumkarzinom.

ABSTRACT

Rectal cancer is one of the most common causes of death from cancer. Accurate staging is necessary for optimal treatment. The tumor node metastasis (TNM) system is used to describe numerically the anatomical extent of cancer. Various diagnostic methods provide accurate staging. Endorectal ultrasound (EUS) and magnetic resonance tomography (MR) are most adequate for determining tumor stage. Moreover, MR is highly accurate in predicting the circumferential resection margin. Accurate node staging remains however difficult with both EUS and MR. Modern multidetector row CT is predestined for detecting distant metastases as it is a widespread, fast, and reproducible method.