Impact of tumour invasion on seminal vesicles mobility in radiotherapy of prostate cancer.

Purpose: Mobility of the seminal vesicles relative to the prostate challenges adequate dose coverage. The aim of this study was to assess the impact of tumour invasion on SV mobility.

Methods And Materials: Three groups of 30 prostate cancer patients with (1) no invasion on MR, (2) minimal invasion (<5mm), and (3) extensive invasion (>5mm) were studied.