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Infratentorial subdural empyema is a life-threatening condition, the common source being an ear infection. We present a 2-year old boy treated for bilateral mastoiditis, with infratentorial- left cerebellopontine angle subdural empyema. Clinical presentation encompassed a systemic febrile illness, headaches, and a stiff neck. Empyema was diagnosed with computed tomography and magnetic resonance imaging. The patient was successfully treated with surgery and appropriate antibiotics. Empyema should be considered in patients with ENT infection associated with neurological signs that suggest a posterior fossa lesion.