A chronic subdural hematoma complicating an arachnoid cyst in a juvenile boxer: a rare case report with comprehensive literature review

Introduction and importance:Arachnoid cyst (AC) is the most frequently founded lesion reported in adolescent patients suffering from chronic subdural haematoma (CSDH). Association between these two distinct clinical entities is known for a long time. However, in the literature there are numerous clinical cases that reflect this relationship and few large series that analyze them in detail. Paediatric population is more rarely affected with this association.Case presentation:The authors report the case of AC of incidental discovery complicated with CSDH in 15-year-old male recreational boxer presented with progressive onset of holocranial drug-resistant throbbing headache with favourable clinical course after conservative treatment.Clinical discussion:ACs are a well-known predisposing cause for CSDH after head trauma. In all cases of CSDH in children, the diagnosis of ruptured AC should be considered. Rupture may be spontaneous or following even mild head trauma with rupture of bridging veins causing subdural bleeding as it was seen in our patient who was practicing a full-contact free-sparring sport like boxing sustaining repeated and direct mild head traumas. MRI is recommended to detect small cysts in adolescents with CSDH. The management of these patients remains controversial.Conclusion:This is a rare reported case of CSDH complicating an AC in a juvenile recreational male boxer. This association remains extremely rare in children and adolescents, as evidenced by the rare cases reported in the literature.