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Malignant tumours of the central nervous system (CNS) represent the second most common cancer type in the paediatric population of developed countries, and mortality caused by CNS tumours is the highest among paediatric cancers. Tumours of mesenchymal origin occurring either as primary or secondary lesions of the central nervous system are very rare in children. This paper describes the case of a 5-year-old non-immunocompromised male who presented with a right frontal primary intracranial leiomyosarcoma associated with large subdural collections. Following surgical excision and adjuvant chemoradiotherapy, the patient has remained disease-free for 18 months. The literature is reviewed and the possible association of the chronic subdurals to the later development of the leiomyosarcoma explored. [ABSTRACT FROM AUTHOR]