Case Report
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World J Stomatol. Nov 20, 2013; 2(4): 103-107
Published online Nov 20, 2013. doi: 10.5321/wjs.v2.i4.103
Soft tissue aneurysmal bone cyst of the mandible: Report of a case
Jahanfar Jahanbani, Donia Sadri, Ali Hassani, Farshid Kavandi
Jahanfar Jahanbani, Donia Sadri, Oral and Maxillofacial Pathology Department, Islamic Azad university, Dental Branch, Tehran, Iran
Ali Hassani, Oral and Maxillofacial Surgery Department, Islamic Azad university, Dental Branch, Tehran, Iran
Farshid Kavandi, Oral and Maxillofacial Surgery, Bu Ali Hospital, Damavand alley, Tehran 15994, Iran
Author contributions: Jahanbani J and Sadri D designed research and wrote the paper; Hassani A prepared the photograph and surgical documents of the case; Kavandi F coordinated things in the surgery and prepared the materials and methods (surgical document) and photographs of following up, followed up the case.
Correspondence to: Donia Sadri, Associate Professor, Oral and Maxillofacial Pathology Department, Islamicazad University, 4, 10th Neyestan, Pasdaran, Tehran 19486, Iran.
Telephone: +98-212-2763449 Fax: +98-212-2763449
Received: February 27, 2013
Revised: April 19, 2013
Accepted: June 1, 2013
Published online: November 20, 2013

We report the case of a 17-year-old boy with a soft tissue aneurysmal bone cyst (STABC) located in the posterior aspect of the right mandible. Conventional radiography revealed no positive findings. On the computed tomography scan, the lesion appeared to have a non-uniform intralesional density. Magnetic resonance imaging revealed an abnormal soft tissue masses with cystic component in the superficial part of right mandibular body and angle with intact cortex. Following histopathological examination, fibro-histiocytic proliferation, blood-filled spaces and multinucleated giant cells were seen and the lesion was diagnosed as a STABC. The mass together with underlying bone and periosteum on its periphery was surgically resected under general anesthesia. Thirty-six months after surgery the patient was assessed at outpatient clinic and found no sign of recurrence This may be only the first reported case of the mandible in the English literature of this extremely rare benign tumor occurring in soft tissue.

Keywords: Bone cysts, Aneurysmal, Mandible, Neoplasm, Soft tissue

Core tip: A case of soft tissue aneurysmal bone cyst (STABC) of the mandible is presented in a male teenager. STABC is a rare entity with histological and radiological features that are identical to those of aneurysmal bone cyst, except for that STABC is of extra osseous location. The differential diagnosis of STABC in this location, includes giant cell tumor of soft tissue and extra skeletal osteosarcoma making it quite a challenge in the process of diagnosis.