<prompt> A 20 year old male presents with scrotal mass. The first investigation to be done isClinical evaluation Palpation and transilluminationUSGBiopsyAFP  <response>: Differential diagnosis are hydrocele, hematocele, epididymal cyst, spermatocele, varicocele, inguinal hernia, testicular tumours . Thus clinical examination should be done first to differentiate between them. 