Fig. 2

A 38 years old male patient with biopsy-proven right distal humerus chondrosarcoma. Tumoral excision was done, and the patient was referred for post-operative assessment of any residual tumors. A, B, C Axial CT images and D, E, F Axial fused PET/CT images show extensive FDG uptake at right elbow at the operative bed infiltrating the surrounding muscles with SUVmax ~ 18.2 associated with multiple right axillary and mediastinal retrocaval lymphadenopathy with corresponding increased FDG uptake (SUVmax ~ 12.9 and 3.5 respectively) as well as metabolically active left lung basal deposit with SUVmax ~ 16.3 denoting local tumoral residue/recurrence, locoregional lymph nodes and distant metastases. Twenty months later, the patient was referred again after total right upper limb amputation for follow-up and detecting any viable tumors. G Coronal CT, and H Coronal fused PET/CT images show significant progression in size, number and metabolic activity of the pulmonary nodular deposits and mediastinal lymphadenopathy with SUVmax reaching up to 18.2 and 9.1 respectively