Figure 3: Elastography of prostate cancer (soft lesion). (a) A hypoechoic lesion without a clear boundary was found in the peripheral zone of the prostate by TRUS (right image, white arrow). The main body of the lesion was shown as green and red by TRTE (left image, white arrow). (b) The section stained with picric acid-sirius red showed that Col1 and Col3 were not cross-linked in distribution. The collagen volume fraction of Col3 (0.6) was greater than that of Col1 (0.02). TRTE: Transrectal Real-Time Tissue Elastography; TRUS: Transrectal Ultrasonography.