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Extraosseous marrow fat: an MRI sign of acute aggressive osteomyelitis
Dorissa Lahner Gursahaney1, M K Jesse1, Jason Stoneback2
1Department of Radiology, School of Medicine, University of Colorado, Aurora, CO, USA.
Abstract:
MRI plays a critical role in the evaluation of osteomyelitis. However, MRI findings of osteomyelitis are not entirely specific and may mimic infiltrative tumors. We describe a case of extraosseous extruded medullary fat with a tiny transcortical tract caused by acute osteomyelitis, diagnosed by MRI and confirmed with intraoperative findings and pathology. Identification of extruded medullary fat is a specific MRI finding that aids in the differentiation of acute osteomyelitis from infiltrative tumor thereby preventing unnecessary biopsy and facilitating prompt diagnosis and initiation of appropriate treatment.
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