A prospective single -centre phase II, single arm, cohort study (therapeutic confirmatory) offering focal therapy using HIFU (Ablatherm ®) to 25 men with histologically proven localised low to intermediate risk prostate cancer (PSA ≤10ng/ml, Gleason score ≤ 7 ,T1c or T2b ). Precise mapping and characterisation of the disease will be established using multi-parametric (mp)-MRI and prostate biopsies. Only the lobe with disease will be treated.