Table 3 The percentages of head CT abnormalities
From: TBI surveillance using the common data elements for traumatic brain injury: a population study
Abnormal CT finding | N | % of total abnormal CTs (n= 1,047) | % of total CTs (n= 2,201) | % of total population (n= 2,394) |
|---|---|---|---|---|
Extracalvarial soft tissue swelling | 368 | 35.1% | 16.7% | 15.3% |
Fracture of skull | 252 | 24.1% | 11.4% | 10.5% |
Fracture of maxillofacial bones (except nose) | 243 | 23.2% | 11.0% | 10.2% |
Fracture of nasal bones | 93 | 8.9% | 4.2% | 3.9% |
Calvarial fracture through carotid canal | 10 | 1% | 0.5% | 0.4% |
Calvarial fracture through foramen magnum | 8 | 0.8% | 0.4% | 0.3% |
Subfalcine herniation | 93 | 8.9% | 4.2% | 3.9% |
Upward transtentorial herniation | 8 | 0.8% | 0.4% | 0.3% |
Downward transtentorial herniation | 76 | 7.3% | 3.5% | 3.2% |
Uncal herniation | 27 | 2.6% | 1.2% | 1.1% |
Tonsillar herniation | 15 | 1.4% | 0.7% | 0.6% |
Epidural hematoma | 77 | 7.4% | 3.5% | 3.2% |
Subdural hematoma | 337 | 32.2% | 15.3% | 14.1% |
Subarachnoid hemorrhage | 319 | 30.5% | 14.5% | 13.3% |
Intraventricular hemorrhage | 65 | 6.2% | 3.0% | 2.7% |
Parenchymal or hemorrhagic contusion | 365 | 34.9% | 16.6% | 15.2% |
Diffuse axonal injury (unilateral/bilateral) | 50 | 4.8% | 2.3% | 2.1% |
ANY bleed | 701 | 67% | 31.8% | 29.8% |
ANY fracture | 425 | 40.6% | 19.3% | 17.8% |