Abstract
A 56-year-old man presented with a painless prepatellar mass of the left knee. MR images demonstrated a large, well-defined mass with heterogeneous intermediate signal intensity on T1- and proton density-weighted images. Mild, heterogeneous enhancement was noted after the intravenous administration of gadolinium. Diagnostic imaging included atypical soft-tissue infection, fibrogranulomatous reaction, gouty tophus, rheumatoid nodule and xanthoma or possibly malignancy. The histopathological examination revealed sarcoidosis involving the prepatellar bursa.
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Acknowledgements
Eric Y. Chang, MD, gratefully acknowledges grant support from the VA Clinical Science Research and Development Career Development Award (IK2CX000749).
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Ruangchaijatuporn, T., Chang, E.Y. & Chung, C.B. Solitary subcutaneous sarcoidosis with massive chronic prepatellar bursal involvement. Skeletal Radiol 45, 1741–1745 (2016). https://doi.org/10.1007/s00256-016-2494-4
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DOI: https://doi.org/10.1007/s00256-016-2494-4