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Radiology for the surgeon: musculoskeletal case 41.(Continuing Medical Education)(Case study)
Publication: Canadian Journal of Surgery Publication Date: 01-JUN-08 Author: Alkubaidan, Fahad O. ; Heffernan, Eric J. ; Munk, Peter L.
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COPYRIGHT 2008 Canadian Medical Association
Presentation
A29-year-old man presented with right knee pain with possible meniscal injury. The patient had suffered a hockey injury 6 years previously, and magnetic resonance imaging (MRI) at that time showed an osteochondral defect of the lateral facet of the patellar cartilage but no other abnormality. Images from the follow-up MRI are shown (Fig. 1).
[FIGURE 1 OMITTED]
What is the most likely diagnosis?
Diagnosis
Lipoma arborescens
The MRI of the knee shows an intra-articular soft tissue mass with polypoid frond-like projections located in the suprapatellar bursa. Areas within the mass follow the signal intensity of fat on all imaging sequences: high [T.sub.1] signal intensity (Fig. 1A), intermediate-to-high [T.sub.2] signal intensity (not shown) and signal suppression on fat saturation sequences (Fig. 1B). The...
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