Table 2. Time dependent magnetic resonance appearance of intramedullary & epidural hemorrhage in dogs.
| Variables | T2W | T1W | FLAIR | STIR | |
|---|---|---|---|---|---|
| Intramedullary hemorrhage | |||||
| Hyperacute (≤ 24 h) | Hyper | Mild hyper | Mild hyper | Hyper | |
| Acute (1–3 day) | Hyper | Mixed | Mild hyper | Hyper | |
| Early (> 3 day) | Hyper | Mixed | Hyper | Hyper | |
| Late (> 7 day) | Hyper | Mixed | Mild hyper | Hyper | |
| Chronic (> 14 day) | Hyper | Mixed | Mild hyper | Hyper | |
| Epidural hemorrhage | |||||
| Hyperacute (≤ 24 h) | Hyper | Mild hyper | Hyper | - | |
| Acute (1–3 day) | Hyper | Iso | Hyper | - | |
| Early (> 3 day) | Iso | Iso | Iso | - | |
| Late (> 7 day) | Iso | Iso | Iso | - | |
| Chronic (> 14 day) | Iso | Iso | Iso | - | |
FLAIR, fluid-attenuated inversion recovery; STIR, short tau inversion recovery.