Abstract
Subdural haematoma with apparent negative CT scan images is cause of pitfalls in clinical setting, especially in emergency room. Considering that clinical findings are atypical in this entity we present a patient and discuss the relevance of magnetic resonance images (MRI) and International Headache Society (IHS) classification in the diagnosis of headache in daily practice of neurology and neurosurgery (Acta Neurol Colomb 2005;21:216-218).
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