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ANEURYSMAL BONE CYST: A CASE SERIES OF AN AGGRESSIVE BENIGN TUMOR
Caio Falk Giannotti1, Nathalia Sundin Palmeira de Oliveira1,2, Jairo Greco Garcia1
1Universidade Federal de Sao Paulo, Departamento de Ortopedia e Traumatologia (UNIFEP/EPM), Sao Paulo, SP, Brazil.
Acta Ortopedica Brasileira
|February 16, 2026
Summary
Aneurysmal Bone Cysts (ABCs) are benign bone tumors. This study found no link between recurrence and patient factors or treatment type, suggesting various methods are effective.
Area of Science:
- Orthopedics
- Pediatric Oncology
- Surgical Oncology
Background:
- Aneurysmal Bone Cysts (ABCs) are benign but locally aggressive bone neoplasms.
- Understanding factors influencing ABC recurrence is crucial for effective management.
- This study investigates epidemiological and treatment-related variables affecting ABC recurrence.
Purpose of the Study:
- To evaluate the association between patient demographics, tumor characteristics, treatment modalities, and recurrence rates in Aneurysmal Bone Cysts.
- To analyze sex, age, tumor location, size, and treatment type (surgical, infiltration, embolization) in relation to ABC recurrence.
- To provide epidemiological data on ABCs consistent with existing pediatric literature.
Main Methods:
- Retrospective analysis of 23 Aneurysmal Bone Cyst cases.
- Descriptive and quantitative statistical analyses, including prevalence ratio and 95% confidence intervals.
- Evaluation of associations between recurrence and sex, age, tumor size, Capanna's classification, and treatment type.
Main Results:
- The study included 23 patients (52.2% male), with a mean age of 11.2 years.
- Most cysts were in the lower limbs (56.5%), with a mean diameter of 5.58 cm.
- The overall recurrence rate was 30.4%, with no statistically significant association found between recurrence and the evaluated variables (p ≥ 0.05).
Conclusions:
- Various treatment modalities, including surgical intervention and infiltration, are suitable for managing Aneurysmal Bone Cysts.
- No specific patient demographic or tumor characteristic was identified as a significant predictor of recurrence in this cohort.
- Epidemiological findings align with previously reported pediatric Aneurysmal Bone Cyst data.
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