Abstract：
Papillary carcinoma of the breast is a rare histologic subtype of invasive breast cancer. In contrast, ductal carcinoma in situ (DCIS) is a noninvasive, nonobligate precursor to invasive mammary carcinoma, confined within the terminal duct lobular unit of the breast and surrounded by an intact myoepithelial cell layer at the stromal/epithelial interface. We present an unusual case in which a patient with only DCIS of the breast exhibited papillary carcinoma within a sentinel lymph node, leading to questions about the origin of the lymph node lesion-whether it represents a true metastasis or iatrogenic displacement during diagnostic procedures. This case underscores the diagnostic challenges and clinical implications associated with such rare presentations.
摘要：
乳腺乳头状癌是一种罕见的浸润性乳腺癌组织学亚型。相比之下,导管原位癌(DCIS)是一种非侵入性、浸润性乳腺癌的非强制性前体，局限在乳房的末端导管小叶单位内，并在基质/上皮界面处被完整的肌上皮细胞层包围。我们介绍了一个不寻常的病例，其中只有乳腺DCIS的患者在前哨淋巴结内表现出乳头状癌，导致有关淋巴结病变起源的问题-在诊断过程中，它是否代表真正的转移或医源性移位。此病例强调了与此类罕见表现相关的诊断挑战和临床意义。
