Background: Prostate rhabdomyosarcoma is a very rare malignancy in young adults. The tumour is characterised by a very rapid growth, local infiltration and early metastasis. Quick recognition and evaluation of its invasiveness are decisive in treatment design and prognosis. Three-dimensional US is recognised as a valuable clinical tool and an adjunct to 2D US. The aim of the study is evaluation of usefulness of 3D ultrasonography in imaging of the prostate tumor infiltration.
Case report: Patient S.K. aged 15, admitted to the Department of Urology, Medical University of Bialystok due to pain of urination and dysuria, preceded by a 2-week period of aggravated dysuric symptoms. Ultrasound of the pelvis and the abdomen was performed which was supplied by 3D sonography.
Conclusions: 3D imaging allowed precise assessment of the prostate capsule destruction and of the extent of
tumor infiltration.

Keywords: 3D sonography, Prostate, Rhabdomyosarcoma