There has been no adequate diagnostic method for the diagnosis o intrascrotal lesions until recent days. But after the development of radionuclide testicular scan, early and relatively accurate diagnosis of the testicular lesions are possible. So the authors analyzed the 32 cases of patients who were examined by testicular scan and confirmed by follow up study or operation, and the results are as follows ; 1. There 32 cases consists of 13 cases of epididymitis, 7 cases of testicular torsion, 4 of cryptorchism, 2 of testicular tumor and etc. The over all diagnostic accuracy is about 69%. 2. In epididymitis, the diagnostic accuracy is 85% (11/13) and the findings of scan are increased perfusion in radionuclide angiogram and hot activity noted mainly in peripheral portion of the testicle in static image. 3. In cases of testicular torsion, diagnostic accuracy is 86%(6/7). Acute torsion shows normal perfusion in angiogram and round cold area in static image. But in missed torsion, perfusion is increased and round cold area with surrounding hyperemia is noted in static image. Radionuclide testicular scan seems to be noninvasive, inexpensive, easily available and simple to perform with low gonadal radiation does. So it can be very useful as the first study in patients with acute testicular symptoms.