ERBB2 and lymphatic system disorder: In 8 patients, lesional uptake with [68Ga]Ga-NOTA-anti-HER2-sdAb PET/CT could be seen in CT-graphic lesions that were not [18F]FDG-avid: in patients 2, 3, 12, and 19 (Supplemental Fig. 4), the [68Ga]Ga-NOTA-anti-HER2-sdAb PET/CT image showed additional adenopathies; in patients 4, 6, 7, and 14, additional bone metastases were revealed (Fig. 4).