Haseki Eğitim ve Araştırma Hastanesi, KBB, İstanbul, Türkiye Fibrous dysplasia is a developmental, non-neoplastic disease of osseous tissue. We presented a 25 years old case with a maxillary monostotic fibrous dysplasia with clinical and diagnostic features. Clinical features, differential diagnosis and treatment options were also discussed. Keywords : Fibrous dysplasia, maxilla