A Case of Ductal and Lobular Carcinoma in Situ Arising within a Fibroadenoma

Key Points

• This case report aims to detail the occurrence of ductal and lobular carcinoma in situ arising from a fibroadenoma.
• Report of a 74-year-old female patient presenting with a breast tumor.
• Diagnostic imaging and histopathological examination conducted to assess the lesions.
• Left breast surgery involved total mastectomy and sentinel lymph node biopsy.
• Diagnosed left breast invasive cancer at cT1cN0M0 stage I, Luminal type.
• Histological evaluation identified non-invasive ductal carcinoma and lobular carcinoma in the fibroadenoma.
• Incidence of carcinoma occurring within a fibroadenoma is reported to be around 0.1%, indicating rarity.