Low-Grade Adenosquamous Carcinoma of the Breast with Diverse Expression Patterns of Myoepithelial Cell Markers on Immunohistochemistry: A Case Study
차윤진, 김기정, 박병우, 구자승,
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차윤진 ( Cha Yoon-Jin )
Yonsei University College of Medicine Department of Pathology
김기정 ( Kim Gi-Jeong )
Yonsei University College of Medicine Department of Pathology
박병우 ( Park Byeong-Woo )
Yonsei University College of Medicine Department of Surgery
구자승 ( Koo Ja-Seung )
Yonsei University College of Medicine Department of Pathology
KMID : 0357920140480030229
Abstract
This paper reports a case of low-grade adenosquamous carcinoma (LGASC) arising in a 69-yearold woman, who presented with a 1-cm palpable mass on her right breast. Core needle biopsy diagnosed the mass as a fibroadenoma. After six months, the mass increased in size, and the patient received subsequent mammotome excision. On microscopic examination, bland-looking small glands were infiltrating into the fibrotic stroma with lymphocytic infiltrates at the periphery. Hematoxylin and eosin staining revealed relatively easily detectable myoepithelial cells along the outside in each of the glandular structures with variable degrees of squamous metaplasia. Based on histologic features, the patient was diagnosed with LGASC. LGASC is a rare variant of metaplastic carcinoma, which is characterized by a favorable prognosis. Due to the bland cytology and presence of myoepithelial cells, LGASC can be misdiagnosed as benign lesion. Additionally, inconsistent expression of myoepithelial markers could aid the diagnosis of LGASC.
키워드
Breast; Carcinoma; Carcinoma; adenosquamous
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