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[Studies of diagnosis of rectal cancer using MRI, CT and intrarectal ultrasonography].

Examination using MRI, CT and Intrarectal Ultrasonography (US) were performed in 186 patients with primary rectal cancer and 127 postoperative cases, in order to diagnose the depth of invasion, lymph node metastases and local recurrence. In the diagnosis of depth of invasion, intrarectal US was superior to MRI and CT for detailed diagnosis, and MRI was the best examination modality for detecting infiltration of other organs. Also, these were available for the diagnosis of lymph node metastases, and intrarectal US was superior to MRI and CT for detecting small lymph nodes. In the detection of local recurrence, MRI, CT guided biopsy and intrarectal US were useful, especially MRI was the best examination for the decision of re-resection.