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Rhabdomyosarcoma is the most common soft tissue sarcoma in childhood and adolescence, arising from the mesenchymal tissue. It is an intrascrotal tumor localized in the paratesticular structures such as the epididymis or spermatic cord. The majority of this tumor occurs in the first two decades of life. Ultrasound is considered the imaging modality of choice for evaluating an intra-scrotal abnormality. We present a case of a 4-year-old boy with a 2-weeks history of rapidly increasing left scrotal swelling which was clinically diagnosed as hydrocoele. We present the ultrasound, elastography and MRI features of a case of paratesticular embryonal rhabdomyosarcoma with pathologic correlation and also emphasize need to consider sarcoma as a differential diagnosis for rapidly growing scrotal swelling.