Under general anaesthetic a bone biopsy was performed.
Histology
MICROSCOPIC DESCRIPTION: Sections include focally calcified fibrous tissue. A single mildly atypical polyhedral cell with vacuolated cytoplasm is present. CAM5.2 immunohistochemistry is negative.
DIAGNOSIS: Left proximal femur lesion bone biopsy: Fibrosis. No evidence of malignancy.