Extranodal Rosai-Dorfman disease involving pulmonary artery detected by 68Ga-FAPI PET/CT and fused 68Ga-FAPI PET/MRI.

SP 18 sp F-FDG PET/CT showed diffusely increased radioactivity in the mediastinum (SUVmax 9.9), but the mass lesion cannot be identified from adjacent background tissue (a). Since a reliable evaluation of disease extent is crucial for adequate treatment of RDD [[2]], SP 68 sp Ga-FAPI PET/MR may be useful for imaging of RDD, especially for assessing the disease extent in extranodal RDD. [Extracted from the article]