Abstract Background Breast carcinoma is uncommon in women under 25 and very rare in less than 20 years old. Only few cases of infiltrating breast carcinoma have been reported and among them there was no report of medullary subtype. The purpose of this report is to determine clinical, histopathological and sonographic findings of large mass in breast of young female patient that diagnosed as medullary carcinoma. Case presentation A 17 year-old female with large mass in her right breast was referred to our clinic. In clinical examination the mass had a fleshy to firm consistency and the borders were not infiltrative. Ultrasonography findings were highly suggested for fibroadenoma. Histopathological examination demonstrated infiltrating breast carcinoma with medullary feature. Conclusion Although breast carcinoma is very rare in patients under twenty years old, in this age group a differential diagnosis with fibroadenoma should be considered.

Keywords: Carcinoma, Ultrasonography, Breast, Fibroadenoma

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