Transrectal prostatic ultrasound peripheral hypoechoid lesions: a progress report.

From July 1, 1989 to June 30, 1990, 432 cases of transrectal prostatic ultrasound were done at San Pablo Hospital. Low density lesions were found in 85 patients in the peripheral zone. Twenty of these 85 cases proved to be malignant for an incidence of 23%. Our experience from January 1, 1988 to June 1989 was published previously. At that time, of a total of 486 cases, 72 patients showed low density lesion in the peripheral zone. Thirty-seven of these proved malignant for an incidence of 51.4%. To our original publication we are adding our recent 85 cases with 20 malignant lesions for a total of 157 cases of low density lesions and a total of 57 malignant lesions. We now have an average incidence of 36.3% malignancies in low density peripheral lesions.