Cerebral hemorrhagic contusions are a type of intracerebral hemorrhage and are common in the setting of significant head injury. They are usually characterized on CT as hyperdense foci in the frontal lobes adjacent to the floor of the anterior cranial fossa and in the temporal poles.
Contusions, by definition, result from head trauma and are thus seen more frequently in young males. Typical causes include motor vehicle accidents or situations in which the head strikes the ground.
Most contusions represent the brain coming to a sudden stop against the inner surface of the skull (contrecoup) accentuated by the natural contours of the skull (see below).
- intraventricular hemorrhage in ~2.5% 7
Cerebral contusions can occur anywhere, but have a predilection for certain locations, as a result of the direction of the head strike and the intrinsic shape of the skull cavity.
Typically cortical contusions become more apparent on follow-up imaging due to further bleed or surrounding edema. Hence on follow-up CT scans in the first couple of days after trauma, one may detect the increase in number and size of the lesions but the patient may not show any clinical deterioration.
Furthermore, the appearance of contusions will vary according to when they are imaged. Typically they mature over some weeks, initially appearing as merely hemorrhagic foci, followed by the development of surrounding edema, before gradually fading away leaving behind more or less distinct areas of gliosis.
In most hospitals, CT is usually the first and often the only investigation used to assess cerebral contusions. Sensitivity to detect intracerebral hemorrhage on CT scans is virtually 100%.
Hounsfield units (HU) of blood are dependent on protein concentration (i.e. hemoglobin) and hematocrit.
With a hematocrit of 45% the density of whole blood is ~56 HU while the grey matter is 37-41 HU and white matter is 30-34 HU. So blood should be hyperdense in comparison to grey or white matter.
Of note, in anemic patients (i.e. hemoglobin <8-10 g/dL) blood may appear isodense in an acute bleeding.
Contusions vary in size and can appear as small petechial foci of hyperdensity/hemorrhages involving the grey matter and subcortical white matter or large cortical/subcortical bleed.
- T1: high signal intensity
- T2*: low signal intensity
- SWI: low signal intensity 8
Signal behavior is strongly dependent on sequence and time since the bleeding started.
- diffuse axonal injury
- cerebral contusions undergo expected evolution of blood products whereas cavernoma stay stable or re-bleed
- look for an associated DVA
- 1. Flint AC, Manley GT, Gean AD et-al. Post-operative expansion of hemorrhagic contusions after unilateral decompressive hemicraniectomy in severe traumatic brain injury. J. Neurotrauma. 2008;25 (5): 503-12. doi:10.1089/neu.2007.0442 - Pubmed citation
- 2. D'avella D, Cacciola F, Angileri FF et-al. Traumatic intracerebellar hemorrhagic contusions and hematomas. J Neurosurg Sci. 2001;45 (1): 29-37. - Pubmed citation
- 3. Hadley DM, Teasdale GM, Jenkins A et-al. Magnetic resonance imaging in acute head injury. Clin Radiol. 1988;39 (2): 131-9. Clin Radiol (link) - Pubmed citation
- 4. Kim J, Smith A, Hemphill JC et-al. Contrast extravasation on CT predicts mortality in primary intracerebral hemorrhage. AJNR Am J Neuroradiol. 2008;29 (3): 520-5. doi:10.3174/ajnr.A0859 - Pubmed citation
- 5. Parizel PM, Makkat S, Van miert E et-al. Intracranial hemorrhage: principles of CT and MRI interpretation. Eur Radiol. 2001;11 (9): 1770-83. Eur Radiol (link) - Pubmed citation
- 6. Wada R, Aviv RI, Fox AJ et-al. CT angiography "spot sign" predicts hematoma expansion in acute intracerebral hemorrhage. Stroke. 2007;38 (4): 1257-62. doi:10.1161/01.STR.0000259633.59404.f3 - Pubmed citation
- 7. Castillo M. Neuroradiology Companion: Methods, Guidelines, and Imaging Fundamentals. LWW. ISBN:1451111754. Read it at Google Books - Find it at Amazon
- 8. Lee A Grant, Nyree Griffin. Grainger & Allison's Diagnostic Radiology Essentials. (2018) ISBN: 9780323568845
Related Radiopaedia articles
Stroke and intracranial haemorrhage
stroke and intracranial hemorrhage
- general discussions
- scoring and classification systems
- Alberta stroke program early CT score (ASPECTS)
- Canadian Neurological Scale
- NIH Stroke Scale
- Mathew Stroke Scale
- modified Rankin scale
- Orgogozo Stroke Scale
- Scandinavian Stroke Scale
- thrombolysis in cerebral infarction (TICI)
- TOAST classification
- collateral vessel scores
- by region
- hemispheric infarcts
- frontal lobe infarct
- parietal lobe infarct
- temporal lobe infarct
- occipital lobe infarct
- internal capsule infarct
- ataxic hemiparesis syndrome: MCA perforators or basilar artery perforators
- lacunar infarct
- thalamic infarct
- striatocapsular infarct
- cerebellar infarct
- midbrain infarct
- pontine infarct
- Brissaud-Sicard syndrome
- facial colliculus syndrome
- Gasperini syndrome: basilar artery or AICA
- inferior medial pontine syndrome (Foville syndrome): basilar artery
- lateral pontine syndrome (Marie-Foix syndrome): basilar artery or AICA
- locked-in syndrome: basilar artery
- Millard-Gubler syndrome: basilar artery
- Raymond syndrome: basilar artery
- medullary infarct
- acute spinal cord ischemia syndrome
- hemispheric infarcts
- by vascular territory
- anterior circulation infarction
- posterior circulation infarction
- treatment options
- by region or type
- basal ganglia hemorrhage
- cerebellar hemorrhage
- cerebral contusions
- cerebral microhemorrhage
- hemorrhagic venous infarct
- hemorrhagic transformation of an ischemic infarct
- hypertensive intracranial hemorrhage
- intraventricular hemorrhage (IVH)
- lobar hemorrhage
- pontine hemorrhage
- jet hematoma
- extra-axial hemorrhage
- extradural versus subdural hemorrhage
- extradural hemorrhage (EDH)
- intralaminar dural hemorrhage
- subdural hemorrhage (SDH)
subarachnoid hemorrhage (SAH)
- vasospasm following SAH
- grading systems
- intra-axial hemorrhage
- ischemic stroke