99m Tc-FAPI-46 Uptake in Simultaneous Occurrence of Benign Thyroid Nodule and Mixed-Mucinous-Invasive Ductal Breast Carcinoma.

Raeisi, Nasrin; Saber Tanha, Amin; Aryana, Kamran; Akbari Oryani, Mahsa; Barashki, Somaye · Clin Nucl Med · 2025

case_report · Level V

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Abstract

We present a case of a 65-year-old woman diagnosed with mixed mucinous-invasive ductal carcinoma, a rare subtype of breast cancer. Utilizing 99m Tc-FAPI-46 scintigraphy, we observed a high target-to-background ratio in the breast mass and metastatic axillary lymph nodes. Notably, a benign follicular nodule was also detected in the thyroid which showed absent 99m Tc-FAPI uptake. Our findings suggest that 99m Tc-FAPI-46 shares similar characteristics with 68 Ga-FAPI and may outperform 18 F-FDG PET/CT in mucinous breast cancer. This case highlights the potential of FAPI as a predictive biomarker for malignancy and its role in benign findings.

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