Vimentin, SMA, and desmin were used for the present case, and only vimentin showed strong positivity with equivocal positivity for SMA.Other differential diagnoses, such as a desmoid tumor, show nuclear ß-catenin positivity and CTNNB1 or APC mutation, while fibrous dysplasia reveals GNAS gene mutation. The gene discussed is SMN1; the disease is fibrous dysplasia.