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Role of [18F]Fluorodeoxyglucose Positron Emission Tomography—Computed Tomography, Sonography, and Sonographically Guided Fine–Needle Aspiration Biopsy in the Diagnosis of Axillary Lymph Nodes in Patients With Breast Cancer

The aim of this study was to compare the diagnostic performance of [18F]fluorodeoxyglucose (FDG) positron emission tomography–computed tomography (PET‐CT) with that of sonography and sonographically guided fine‐needle aspiration (FNA) for determining the preoperative axillary lymph node (ALN) status and to evaluate the factors related to false‐negative PET‐CT, sonographic, and FNA results in ALN staging of invasive ductal carcinoma.