Summary of changes in MR imaging appearance in patients with spontaneous intracranial hypotension
| Pt. No. | DPME | DPMHF | Maximum Thickness of Subdural Effusion/Hematomas | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Initial | Second | Follow-Up | Initial | Second | Follow-Up | Initial | Second | Follow-Up | |
| 1 | Yes | Yes | Slightly | Yes | Yes | NP | bil. thick | bil. very thick | ND |
| 2 | Yes | NP† | NP | Yes | NP† | ND | thick/thin* | NP† | ND |
| 3 | Yes | NP | ND | Yes | Slightly | ND | bil. thin | bil. thin | ND |
| 4 | Yes | Slightly | Slightly | Yes | ND | ND | bil. thick | bil. very thick | bil. thin |
| 5 | Yes | Slightly | ND | Yes | ND | ND | bil. very thin | bil. very thin | ND |
| 6 | Yes | Slightly | ND | Yes | ND | ND | ND (DPMHF) | ND | ND |
| 7 | Yes | Remain | Slightly | Yes | Remain | ND | thick/thin* | thick/ND (DPMHF)* | thin/ND* |
| 8 | Yes | Yes | Slightly | Yes | Yes | ND | ND (DPMHF) | bil. very thin | ND |
Note:—DPME indicates diffuse pachymeningeal enhancement; DPMHF, diffuse pachymeningeal hyperintensity on FLAIR imaging; NP, not performed; ND, not detectable; Slightly, slightly remain; bil., bilateral; very thin, ≤3 mm; thin, >3 mm–≤6 mm; thick, >6–≤10 mm; very thick, >10 mm.
* Left side/right side.
† Only in patient 2, second study was performed after strict bed rest but before successful epidural blood patch.