PMC7474778_01
MRI T2 fat-saturated coronal image demonstrating acetabular and periacetabular soft tissue edema (*) and a small joint effusion (arrow) in the left hip.
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Initial MR arthrogram of the left hip showed marked edema of the medial and posterior walls of the left acetabulum (Figure 1).
Bone scan demonstrating abnormal uptake in the left acetabulum, lateral to excreted isotope in the bladder (arrow).
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Bone scan was unremarkable apart from focal increased uptake in the left acetabulum (Figure 2).
MRI contrast-enhanced T1 fat-saturated axial image demonstrating enhancing bone edema (*) and medial synovial thickening with enhancement (arrow).
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Repeat contrast-enhanced MRI showed left hip effusion that decreased from before, with medial focal synovial enhancement and edema of the acetabulum (Figure 3).
CT scan demonstrating a low attenuation intra-articular lesion with adjacent sclerosis (arrow).
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It showed 11 x 6 mm low attenuation focus with subtle internal nidus in the posteromedial aspect of the acetabular rim suggestive of intra-articular OO (Figure 4).