n SA Journal of Radiology - Subarachnoid or subdural effusion? : pictorial interlude




Extracted from text ... PICTORIAL INTERLUDE 42 SA JOURNAL OF RADIOLOGY ? September 2006 Often one is confronted with an extracerebral fluid collection/ effusion when interpreting computed tomography (CT) of the brain in children. To determine whether the effusion is subarachnoid or subdural, a few basic principles should be kept in mind. Subdural effusions are crescent-shaped, 1 especially over the frontal and parietal lobes, with the vessels 'pasted' against the cerebral surface (Fig. 1).2 The interhemispheric fissure anteriorly can be V-shaped or asymmetrical, as the hemisphere is displaced away from the falx at an angle (Figs 2a and b).2 Subarachnoid effusions emphasise the ..


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