Multimodality Imaging Features of Orbital Necrobiotic Xantogranuloma: A Case Report and Literature Review
Main Article Content
Abstract
Background: Necrobiotic xanthogranuloma (NXG) is a rare non-Langerhans histiocytosis that primarily manifests as skin lesions and is often associated with hematologic disorders, particularly monoclonal gammopathy. The orbit is the most common site of extracutaneous involvement in NXG. Since its first description in 1980, the molecular pathology and dermatologic characteristics of NXG have been extensively studied. However, there is no comprehensive multimodality description of the imaging features of orbital NXG in the literature. This case report aimed to describe the imaging features of NXG and provide a brief overview of the imaging differentials.
Patient presentation: A 16-year-old white young man was referred to our center for evaluation of a 6-year history of a slowly growing right orbital mass, which resulted in vision loss in his right eye. His medical history was notable for systemic juvenile rheumatoid arthritis (sJRA) and a gain-of-function (GOF) mutation in the IKAROS gene, which predisposed him to immune dysregulation. To further characterize the orbital lesion, orbital computed tomography (CT), magnetic Resonance Imaging (MRI), and Fluorodeoxyglucose Positron Emission Tomography/Magnetic Resonance Imaging (FDG PET/MRI) were performed. A biopsy of the most hypermetabolic component of the infiltrative retro-orbital mass confirmed the diagnosis of NXG. He received high-dose immunosuppressive and IVIG therapy and bone marrow stem cell transplantation, which resulted in a slight reduction in the right orbital mass.
Conclusion: This paper presents the first multimodality imaging features of orbital necrobiotic xanthogranuloma in an adolescent patient.
Article Details
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