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A case of botryoid-type embryonal rhabdomyosarcoma


  • Conflict of interest: none declared.

Dr Mi-Woo Lee, Department of Dermatology, Asan Medical Center, College of Medicine, University of Ulsan, 388-1, Poongnap-Dong, Songpa-Gu, Seoul, 138-36, Korea


We describe an infant with a congenital polypoid anal mass, diagnosed as botryoid-type embryonal rhabdomyosarcoma. Histological examination revealed myxoma-like appearance and cells with greater differentiation with elongated streaming eosinophilic cytoplasm and one or two nuclei, suggestive of rhabdomyoblasts. Tumour cells were strongly immunoreactive for desmin and 10% of cells displayed immunoreactivity for myoglobin. We present this case with a view to highlighting the benign clinical and histological appearance of botryoid-type embryonal rhabdomyosarcoma. Early biopsy is essential for improving prognosis.