18F-FDG PET/MR Assessment of Pediatric Langerhans Cell Histiocytosis

Abstract

Jialing Niu,1,2 Jiangtao Liang,3 Qi Feng,2 Mei Wang,2 Luoyu Wang,4 Xiuhong Ge,2 Xiao Wang,5 Zhongxiang Ding2,6 1Zhejiang Chinese Medical University, Hangzhou, People’s Republic of China; 2Department of Radiology, Affiliated Hangzhou First People’s Hospital Zhejiang University School of Medicine, Hangzhou, People’s Republic of China; 3Hangzhou Universal Medical Imaging Diagnostic Center, Hangzhou, People’s Republic of China; 4Institutes of Psychological Sciences, Hangzhou Normal University, Hangzhou, People’s Republic of China; 5Department of Radiology, Wenrong Hospital of Hengdian, Jinhua, People’s Republic of China; 6Translational Medicine Research Center, Key Laboratory of Clinical Cancer Pharmacology and Toxicology Research of Zhejiang Province, Affiliated Hangzhou First People’s Hospital, Zhejiang University School of Medicine, Hangzhou, People’s Republic of ChinaCorrespondence: Xiao Wang; Zhongxiang Ding Email [email protected]; [email protected]: Langerhans cell histiocytosis (LCH) is a histiocytic proliferative disease without a well-understood etiology. The aim of our study is to summarize the imaging features of PET/MR in children with LCH and to explore its diagnostic role in LCH.Methods: Retrospective analysis was performed of the pretreatment PET/MR imaging data of 15 children with LCH. Comparison of ADC values was done between lesions and normal tissues.Results: Of the fifteen patients enrolled, five had single-organ or single-system involvement, and ten had multiple-system involvement. Nine patients had varying degrees of bone destruction and increased FDG uptake, whereas thickening and deviation of the pituitary stalk and disappearance of the normal high-signal intensity of T1WI in the neurohypophysis were observed in the pituitary gland in six of them. Splenomegaly with diffuse increased FDG uptake or a normal spleen with increased FDG uptake was found in four cases, liver in three, multiple lymph node enlargement in three, pulmonary lesions in three, and increased metabolism in medullary cavity in two cases. Additionally, two cases involved the skin. Hypermetabolic nodules were detected in muscle in one case, thyroid involvement in one case, and a mediastinal lesion in one case.Conclusion: PET/MR can show well the distribution of the organs, systems, and lesions involved in LCH and is of considerable significance in the systemic evaluation of LCH.Keywords: LCH, PET/MR, fluorodeoxyglucose F18, imaging, histiocytosis, eliminate imaging

Keywords

• lch
• pet/mr
• fluorodeoxyglucose f18
• imaging
• histiocytosis
• eliminate imaging