Presentation
Chronic intermittent left groin and buttock pain with recent progression in the last two weeks.
Patient Data
An exophytic bony lesion at the lesser trochanter of left femoral neck composed of cortical and medullary components in broad-based continuity with parent bone suggestive of sessile osteochondroma with no cartilage cap is seen.
The lesion narrows the ischiofemoral space leading to interstitial edema (grade I muscle strain pattern) involving left quadratus femoris muscle consistent with ischiofemoral impingement.
Case Discussion
Although radiography is frequently pathognomic for the diagnosis of osteochondromas, MRI is the best imaging modality for evaluating the cartilage cap and secondary effect on adjacent structures especially in symptomatic patients or in unusual locations.
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