Invasive Lobular Carcinoma of the Breast With Solid Renal Metastasis on 18F-FDG PET/CT.

Herein we present a case with recurrent invasive lobular carcinoma of the breast with solid renal metastasis detected on 18F-FDG PET/CT. Invasive lobular carcinoma constitutes ∼5%-15% of all invasive breast cancers and is the second most common type of breast cancer. 18F-FDG PET/CT is routinely used for staging and restaging invasive lobular carcinoma of the breast. Although distant solid organ metastasis is common, renal metastasis remains an exceptionally rare occurrence in ILC. This case highlights the importance of considering renal involvement in the metastatic spread of invasive lobular carcinoma, especially when using 18F-FDG PET/CT.