[The image of prostatic adenoma and cancer in transrectal sonography].

The transrectal ultrasonography of the prostate is introduced. The sonographic appearance of the adenoma and carcinoma in 357 histologically proven cases is evaluated. Shape, symmetry and definition of the capsule are more reliable differential criteria than the internal echogenicity. The sensitivity is 96.6% for adenoma and 84.2% for carcinoma, whereas the sensitivity of palpation is 91.7% and 77.5% respectively. 6 early cancers are detected. Since infiltration of the capsule and the seminal vesicles can be seen, staging of carcinoma is considerably improved. Accurate measurement of the prostatic size helps in operative planning. Indication and diagnostic value of the method are discussed.