Abstract
Breast cancer constitutes a heterogenous group of lesions. Invasive papillary carcinoma of the breast is a rare form of breast cancer with less aggressive behavior which may have mucinous differentiation. Histologically papillary projections with fibrovascular core and epithelial proliferation are present. Signet ring morphology and extracellular mucin production can be seen but myoepithelial cells are absent. We reported a case of invasive papillary carcinoma of the breast in a 74-year-old lady without mucin production, which first presentation was a metastasis of unknown origin to the spinal column as adenocarcinoma with mucin production. In conclusion, although invasive papillary carcinoma of the breast is known as a less aggressive tumor, but its presentation may be with metastasis and mucin production, despite of non-mucinous primary tumor.
Published Version
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