Fig. 1

A 22-year-old male was diagnosed with inoperable metastatic right carotid body tumor in 2015. The baseline pre-therapy diagnostic ⁶⁸Ga-DOTANOC PET/CT scan showed somatostatin receptor (SSTR) avid soft tissue mass lesion involving the right carotid body mass measuring 2.6 × 1.7 × 2.7 cm (a, c), with multiple B/L SSTR avid lung nodules (d) and skeletal metastases in the left femur (a). After 4 cycles of ¹⁷⁷Lu-DOTATATE therapy, the follow-up diagnostic ⁶⁸Ga-DOTANOC PET/CT scan showed partial morphological response with complete resolution of lung metastases and minimal residual disease in the primary tumor (b, e, f)