Subdural hygroma
Updates to Article Attributes
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Subdural hygromas refer to a cerebrospinal fluid (CSF) accumulation in the subdural space. In many cases it is considered an epiphenomenon of head injury when it is called a traumatic subdural hygroma.
Pathology
They generally occur along the supratentorial cerebral convexities; occurrence in the posterior fossa is generally rare 4.
Aetiology
- idiopathic: in paediatric patients
- trauma: secondary to tear in the arachnoid mater
- post surgical, e.g. haematoma evacuation, ventricular drainage
- spontaneous intracranial hypotension
Radiographic features
CT/MRI
Crescentic CSF density/signal accumulation of CSF in subdural space that does not extend into the sulci. Vessels rarely cross through the lesion in contrast enhanced studies (see cortical vein sign).
Differential diagnosis
Imaging differential considerations include:
- chronic subdural haematoma: MRI may required to differentiate as they can have an identical appearance on CT
- cortical atrophy/involutional change with enlargement of the subarachnoid space: a positive cortical vein sign may indicate this instead
- benign enlargement of the subarachnoid spaces in infancy: a positive cortical vein sign may indicate this instead
-</ul><h4>Radiographic features</h4><h5>CT/MRI</h5><p>Crescentic CSF density/signal accumulation of CSF in subdural space that does not extend into the sulci. Vessels rarely cross through the lesion in contrast enhanced studies.</p><h4>Differential diagnosis</h4><p>Imaging differential considerations include:</p><ul>- +</ul><h4>Radiographic features</h4><h5>CT/MRI</h5><p>Crescentic CSF density/signal accumulation of CSF in subdural space that does not extend into the sulci. Vessels rarely cross through the lesion in contrast enhanced studies (see <a title="Cortical vein sign" href="/articles/cortical-vein-sign">cortical vein sign</a>).</p><h4>Differential diagnosis</h4><p>Imaging differential considerations include:</p><ul>
-<li>cortical atrophy/involutional change with enlargement of the subarachnoid space: a positive <a title="Cortical vein sign" href="/articles/cortical-vein-sign">cortical vein sign</a> may indicate this instead</li>- +<li>cortical atrophy/involutional change with enlargement of the subarachnoid space: a positive <a href="/articles/cortical-vein-sign">cortical vein sign</a> may indicate this instead</li>
Systems changed:
- Trauma
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