Fetal Rhabdomyoma (F-RM) inside scrotum in a 2-years-old boy: Clinical and pathological finding

Fetal Rhabdomyoma (F-RM) is a benign tumor of mesenchymal tissue with the characteristics of cross striated muscle, involving mainly the soft tissue around ears, neck and mucosa of the nasopharynx, oropharynx and laryngeal. There have been very few reports of F-RM inside the scrotum. Here we presented a case of a 2-year-old male child with fetal rhabdomyoma inside his scrotum close to the testis. Histopathology shows that the tumor tissue is mainly composed of skeletal muscle cells in diverse differentiated states and a few undifferentiated lobus intermedius cells. The part of immature skeletal cell of the tumor displayed spindle shape and showed intersected and/or fascicular in the arrangement. The tumor cells are void of aberrant enucleated and dividing phase. Consequently, the patient is presently in good condition and requires a follow-up survey. Conclusively, genital rhabdomyoma is a rare tumor of skeletal muscle origin. We presented the clinical, histological, and immunohistochemical findings of paratesticular fetal rhabdomyoma in a 26-month-old boy. To our knowledge, it is the second case in the scrotum to have been reported in children. (C) 2013 Elsevier Inc. Open access under CC BY-NC-ND license.