Ddx for non-traumatic causes of IPH
Stages of parenchymal hematoma on MR
- Dark rim on hyperacute T2 due to deoxygenation of the most peripheral RBCs
NOTE
These do not apply to extra-axial blood and timing is generally not given for extra-axial blood
| Stage | Time (Range) | Blood Products | T1 | T2 |
|---|---|---|---|---|
| Hyperacute | < 24 hours | Oxyhemoglobin | Isointense | Bright |
| Acute | 1-3 days (hours to days) | Deoxyhemoglobin | Isointense | Dark |
| Early subacute | > 3 days (days to 1 week) | Intracellular methemoglobin | Bright | Dark |
| Late subacute | > 7 days (1 week to months) | Extracellular methemoglobin | Bright | Bright |
| Chronic | > 14 days (≥ months) | Hemosiderin | Dark | Dark |