We present an 8 year old patient with aneurysmal bone cyst involving lateral third of right clavicle. This represents a rare condition and a rare site for this age group which is difficult to diagnose and treat. This patient was treated surgically with curettage and autologous bone grafting. She responded favorably to this form of treatment and lesion was healed at latest follow up of 48 weeks postoperatively. Introduction Aneurysmal bone cyst is a benign but locally aggressive lesion of the bone which accounts for 3% of all bone tumours.its histology is characterized by multiloculated cystic tissue filled with blood. Etiology and pathogenesis of this lesion remains unclear and it affects 0.14 patients per 100000 individuals every year. [1]It is a disease mainly of the young with a peak incidence in the second decade. However it may on occasion occur in the elderly and the very young. [2] Aneurysmal bone cyst may involve almost any bone but the most frequent sites are long tubular bone and vertebrae. Among flat bones, the pelvis and scapula are well known locations. Despite very characteristic radiological features, the unusual age coupled with the uncommon site led to diagnostic difficulties in present case report. The clavicle is a rare site for these lesion and not many have been reported in literature. Smith in 1965 could find only 25 cases in the medical literature, textbooks and atlases [3]. Because of these factors, this report is felt to be of interest. Case Report An 8 year old female child presented with swelling in her right clavicular region that had been increasing in size progressively since last six months. The swelling was not painful and was without neurological deficit. She did not have any history of previous trauma. Her past medical history was unremarkable. She was an otherwise healthy active young girl. Her clinical examination was remarkable for a 1.5 * 1.5 cm size mass that was prominent at the acromial end of his right clavicle(figure 1). The mass was bony hard in consistency and non tender. Overlying skin temperature was normal. There was no other body swelling .No cervical or axillary lymphnode was palpable.
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