Mesenchymal Lesion in an Adolescent Girl-A Rare Case Report.

Rhabdomyosarcoma (RMS) comprises 3% of all childhood malignancy. Commonly it involves head and neck, extremity and genitourinary systems. Pure primary RMS of breast is a rare malignacy. Here, we present a case of adolescent girl presented with breast lump which was initially treated as benign lesion with excision. Again she presented with recurrent mass which was operated and microscopically showed features of small blue round cell tumour which has lead to many diagnostic confusions both clinically and histopathologically. Immunohistochemistry with strong nuclear myogenin positivity in >50% of tumour cells confirms the diagnosis of primary mammary RMS. Postoperative period was uneventful. [ABSTRACT FROM AUTHOR]