FDG PET/CT in a Case of Solid Papillary Carcinoma of the Breast

Solid papillary carcinoma of the breast is a rare low-grade tumor of the breast with unique histology and frequent neuroendocrine differentiation. The tumor usually affects older women with a favorable prognosis. We describe FDG PET/CT findings in a patient with unilateral invasive solid papillary carcinoma of the breast with ipsilateral axillary lymph node metastasis. The primary breast tumor showed focal intense activity (SUV max , 8.8), and the enlarged metastatic axillary lymph node showed higher FDG uptake (SUV max , 17.8) than the primary tumor. This case indicates that FDG PET/CT may be useful for staging this rare tumor, which needs further investigation.