18 F-fluoro-2-deoxyglucose positron emission-computed tomography in a rare cutaneous form of Rosai-Dorfman disease: A case report.

Rosai-Dorfman disease (RDD), or sinus histiocytosis with massive lymphadenopathy, commonly involves the lymph nodes but may secondarily involve the skin. Purely cutaneous disease without lymphatics or internal organ involvement occurs rarely. The present report detailed a rare case of 18 F-fluoro-2-deoxyglucose positron emission-computed tomography (18 FDG PET-CT) performed in a 33-year-old male soldier with a purely cutaneous form of RDD. Staging with 18 FDG PET-CT was ordered prior to excisional biopsies of the aforedescribed masses and pathology reported RDD. The case demonstrated accurate localization of increased radioglucose metabolism. The present case was also discussed in light of literature data in terms of clinical features, etiologies, histology, medical imaging, therapy planning and prognosis.