[Colorectal carcinoma--intracavitary sonography].

Staging of rectal carcinoma effected in 32 patients via ultrasound was re-examined on the basis of histological findings. One patient was classified in T3 by ultrasound, although histologically he belonged to the T2 stage. In no case was the spread of the tumour underestimated. Other indications for endosonography of the rectum are: aftercare of patients subjected to deep resection, and diagnosis of extraluminal processes.