FDG PET/CT in Papillary Intralymphatic Angioendothelioma of the Spleen.

Splenic papillary intralymphatic angioendothelioma is extremely rare. We describe FDG PET/CT and MRI findings of splenic papillary intralymphatic angioendothelioma in a young adult. The splenic tumor showed hypodensity and increased FDG uptake with SUV max of 4 on PET/CT, heterogeneous signal intensity with internal hypointense stellate scars on T2-weighted image, and progressive centripetal enhancement on dynamic contrast-enhanced T1-weighted images. This case indicates that papillary intralymphatic angioendothelioma should be included in the differential diagnosis of FDG-avid splenic lesions.