Sections from bone show thinned out bone trabeculae with separating widened marrow spaces with hypocellular marrow elements. Focally, bone trabeculae are necrotic and thinned out. No evidence of specific granulomas. No evidence of malignancy.
Head of femur with avascular necrosis.
Bone fragment measured 5.5x5x cm, totally embedded.
Head of femur mass, excision biopsy: