TY - JOUR JF - iums-jros JO - J. Res. Orthop. Sci. VL - 6 IS - 4 PY - 2019 Y1 - 2019/11/01 TI - Acetabular Aneurysmal Bone Cyst TT - N2 - Background: Aneurysmal Bone Cysts (ABCs) are benign destructive tumors. Their diagnosis is sometimes challenging, and their treatment in unusual sites, especially in the pediatric age group is difficult, too. This study aims to support the paraclinical measures along proper consultation to approach the pelvic ABC. Methods: We present a 9-year-old female who suffered from pain in the left hip 3 months before the referral. A pelvic mass was diagnosed and unfortunately misdiagnosed with an ovarian mass. It was led to a wrong operation with a wrong approach by a general surgeon and result in intra-operative bleeding and delay in diagnosis and treatment. the final diagnosis was massive ABC in the supra-acetabular area with extension to the ilium and pubic. Conclusion: Pelvis is one of the most challenging sites for the diagnosis and treatment of bone tumors. Large ABC tumors in the hip are unusual and may be presented by non-specific signs and symptoms. Therefore complete clinical and radiological evaluations should be done before any attempt to surgically remove the pelvic mass. Prognosis is excellent if the pelvic mass remove wisely by an experienced hip surgeon. SP - 35 EP - 40 AU - Dastjerdi, Ali AU - Shahpari, Omid AU - Mazloumi, Mahdi AU - Elahpour, Nafise AD - Orthopedic Research Center, Ghaem Hospital, Mashhad University of Medical Science, Mashhad, Iran. KW - Aneurysmal bone cysts KW - Bone tumor KW - Surgical treatment UR - http://jros.iums.ac.ir/article-1-2050-en.html DO - 10.32598/JROSJ.6.4.77 ER -