Testicular tumours are strongly associated with cryptorchid testis. The higher the level of arrest during the descent, greater is the risk. The incidence of testicular tumour is 11 times more in inguinal testis and 50 times more in intra abdominal testis. We are reporting a case of seminoma testis in an undescended right inguinal testis in a 30 years old adult male presented as an inguinal lump. In any case of inguinal lump, clinician must look for history and examination of the scrotum to rule out an undescended testis