TY - JOUR AB - We report the case of a 10‑year‑old girl with a soft tissue aneurysmal bone cyst (STABC) located in the posterior aspect of the left shoulder. Conventional radiography revealed an oblong mass with a calcified rim. On the computed tomography scan, the lesion appeared to have a non-uniform intralesional density with an incomplete rim. Magnetic resonance imaging revealed a multi‑cavity lesion with fluid‑fluid levels. Following pathological examination, the lesion was diagnosed as a STABC. This may be only the twentieth reported case in the English literature of this extremely rare benign tumor occurring in soft tissue. Eight months after surgery the patient was assessed at our outpatient clinic and found to have excellent mobility of her left shoulder and no sign of recurrence. AD - Department of Orthopaedics, Shanghai Key Laboratory of Orthopaedic Implant, Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200011, P.R. China Department of Ophthalmology, Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200011, P.R. China AU - Hao,Yongqiang AU - Wang,Lei AU - Yan,Mengning AU - Jin,Fangchun AU - Ge,Shengfang AU - Dai,Kerong DA - 2012/03/01 DO - 10.3892/ol.2011.530 EP - 548 IS - 3 JO - Oncol Lett KW - aneurysmal bone cyst soft-tissue neoplasm child differential diagnosis PY - 2012 SN - 1792-1074 1792-1082 SP - 545 ST - Soft tissue aneurysmal bone cyst in a 10-year-old girl T2 - Oncology Letters TI - Soft tissue aneurysmal bone cyst in a 10-year-old girl UR - https://doi.org/10.3892/ol.2011.530 VL - 3 ER -