Metaplastic carcinoma of the breast with transformation from adenosquamous carcinoma to osteosarcomatoid and spindle cell morphology

Chuthapisith,Suebwong; Warnnissorn,Malee; Amornpinyokiat,Nattawut; Pradniwat,Kanapon; Angsusinha,Tamnit

doi:10.3892/ol.2013.1464

Metaplastic carcinoma of the breast with transformation from adenosquamous carcinoma to osteosarcomatoid and spindle cell morphology

Authors:
- Suebwong Chuthapisith
- Malee Warnnissorn
- Nattawut Amornpinyokiat
- Kanapon Pradniwat
- Tamnit Angsusinha
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Affiliations: Department of Surgery, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok 10700, Thailand, Department of Pathology, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok 10700, Thailand, Thanyarak Breast Imaging Center, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok 10700, Thailand
Published online on: July 15, 2013 https://doi.org/10.3892/ol.2013.1464
Pages: 728-732

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Abstract

Metaplastic carcinoma of the breast refers to a heterogenous group of mammary carcinomas that contain a mixture of various cell types, including squamous cells, spindle cells and/or a mesenchymal component, such as bone or cartilage. To the best of our knowledge, the clinical course of a tumour that has undergone a transformation from one type of metaplastic carcinoma to another subtype has not previously been reported. The present study reports the five‑year clinical and pathological course of a metaplastic breast carcinoma in a 55‑year‑old female, who was diagnosed with a sclerosing fibroadenomatous nodule with osseous metaplasia and focal atypia. A recurrent tumour was documented four years later, showing a predominant component of osteosarcoma with adenosquamous carcinoma. Upon pathological review of the initial mass, the diagnosis was changed to low-grade adenosquamous carcinoma. The patient was treated with breast conserving therapy. However, one year later, a recurrent metaplastic carcinoma with spindle cell morphology was documented and surgically removed by mastectomy. Subsequently, pulmonary invasion of the chest wall occurred and the patient eventually succumbed due to the invasive nature of the disease.

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