Aneurysmal bone cysts in gnathic bones: clinicopathological profile through a multicenter study and literature review.
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OBJECTIVE: To analyze the clinicopathological profile of aneurysmal bone cysts (ABCs) in gnathic bones in a Brazilian population through a multicenter study and literature review. STUDY DESIGN: A retrospective study across six Brazilian centers for oral and maxillofacial pathology collected data on sex, age, pain, location, radiographic features, and associated lesions. A literature review was performed using four databases. RESULTS: Among 55,068 biopsies of oral and maxillofacial lesions, 26 cases were diagnosed as ABCs. Most patients were females, with a mean age of 24.7 years. The mandible was the most affected site, and pain was absent in 76.9% of cases. A multilocular radiographic pattern with bone expansion was observed in 76.92% of cases. It was associated with ossifying fibroma and fibrous dysplasia in 11.54% and 3.85% of cases. The review included 35 articles and 59 cases, with 52.54% female patients, a mean age of 18.8 years, and mandibular involvement in 76.27%. Multilocularity with expansion occurred in 61.02%, and pain in 61.02%. CONCLUSIONS: This multicenter study provides the first epidemiological estimate of gnathic ABCs (0.047%) and suggests a female and young adult predominance.