What are your top 4 differentials at this point?
1. Chondroblastoma / low grade chondrosarc
2. Giant cell tumor
3. subchondral cyst / intraosseous ganglion
4. Fibrous dysplasia
5. Eosinophilic granuloma
A well-defined, lucent lesion is observed in right supraacetabular region with a thin rim of sclerosis. There is no evidence of osseous expansion, cortical violation or periosteal reaction. Soft tissues are unremarkable.