Figure 1. Lesion detection by PET/CT in posttransplant myeloma patients.

Out of 37 patients undergoing ¹⁸F-FDG-PET/CT, 28 (76%) had a positive scan. 14 out of those 28 (50%) presented with disease confined to the intramedullary compartment (IMD = intramedullary disease), 11/28 patients (39%) suffered from both intra- and extramedullary disease (IMD + EMD) and the remaining 3/28 patients (11%) had exclusively extramedullary MM manifestations. 16 patients (57%) also showed involvement of the appendicular skeleton, with 7/16 (44%) also presenting with EMD. In 9/37 patients (24%) with serological relapse, no metabolically active MM lesions could be detected.