Clinical Experience with TNF Inhibition and Longitudinal Image Monitoring in Osseous Sarcoidosis

Background In this case series, we present longitudinal imaging surveillance of 6 cases of osseous sarcoidosis, each of which was effectively treated with tumor necrosis factor (TNF) inhibition. Methods We identified 6 patients from Brooke Army Medical Center with osseous sarcoidosis, who were treated with TNF inhibition and followed with longitudinal imaging studies. Cases of osseous sarcoidosis were defined as having pathologic evidence of noncaseating granulomas on bone biopsy and evidence of osseous lesions on imaging attributable to sarcoidosis by the radiologist, treating clinician, and reviewer. Clinical data were obtained through review of the military electronic medical record. Results Longitudinal imaging with positron emission tomography/computed tomography, magnetic resonance imaging, and bone scintigraphy assisted in the identification of active disease and clinical remission. Imaging progression of asymptomatic lesions was associated with the eventual development of bone pain 1 to 3 years later. Clinical remission was achieved in all six cases of osseous sarcoidosis and effective doses for TNF inhibition were adalimumab 40 mg subcutaneously every 1 to 2 weeks and infliximab 5 mg/kg every 6 to 8 weeks. Time to complete imaging response ranged from 3 to 8 months. Conclusions Longitudinal imaging with bone scintigraphy, positron emission tomography/computed tomography, and magnetic resonance imaging demonstrated several benefits including evaluation for occult disease, surveillance of asymptomatic lesions, and evaluation of treatment response. TNF inhibition with adalimumab or infliximab was successful in all cases, and complete resolution of osseous lesions was demonstrated in 5 of 6 patients. Discontinuation of TNF inhibition led to disease recurrence in 2 cases, which prompted the use of long-term immunosuppressive therapy in all treated patients.