Summary of clinical characteristics
| No | Sex/age (years) | Vaccine (dose) | Laterality | Days from vaccination to symptom onset/nadir | Weakest muscle strength at nadir (MRC) | MRI | CSF analysis* | Treatment | Outcome |
| 1 | M/31 | Janssen | Ipsilateral | 6/7 | III | Prominent ipsilateral axillary and cervical lymph nodes | WBC 0, protein 70 | None | Full recovery by week 1 |
| 2 | M/37 | Janssen | Ipsilateral | 14/14 | IV+ | Normal | ND | Oral prednisolone, gabapentin | Near-full recovery by week 10 |
| 3 | M/71 | AstraZeneca (first dose) | Ipsilateral | 16/35 | III | Signal changes and enlargement from the C8 root to the inferior trunk, prominent ipsilateral cervical and axillary lymph nodes | WBC 2, protein 57 | Oral prednisolone, gabapentin | Poor recovery by week 15 |
| 4 | M/63 | AstraZeneca (first dose) | Ipsilateral | 14/14 | III | ND | ND | None | Poor recovery by week 4, lost to follow-up thereafter |
| 5 | F/65 | AstraZeneca (first dose) | Ipsilateral | 5/6 | III | Prominent ipsilateral axillary lymph nodes | ND | None | Full recovery within 2 months |
| 6 | M/61 | AstraZeneca (second dose) | Ipsilateral | 2/3 | II | Signal changes and enlargement from the C8 root to the inferior trunk and medial cord, prominent cervical and axillary lymph nodes | ND | Oral prednisolone | Partial recovery by month 5 |
| 7 | F/31 | Cross-vaccination (AstraZeneca and then Pfizer)† | Ipsilateral | 2/10 | IV | Prominent ipsilateral axillary and cervical lymph nodes | ND | None | Full recovery by week 3 |
| 8 | F/50 | Pfizer (first dose) | Contralateral | 4/16 | III | Normal | ND | NSAIDs, fentanyl patch, IVMP | Good response to IVMP |
| 9 | M/58 | Pfizer (first dose) | Ipsilateral | 5/30 | II | ND | ND | Oral prednisolone, pregabalin | Poor recovery by week 8 |
| 10 | F/23 | Pfizer (first dose) | Ipsilateral | 10/11 | V | ND (ipsilateral axillary lymphadenopathy in ultrasonography) | ND | Oral prednisolone, pregabalin | Partial recovery within week 6 |
| 11 | F/81 | Pfizer (first dose) | Bilateral | 15 NA | IV | Normal | ND | Pregabalin, nortriptyline, NSAIDs | Poor recovery by month 6 |
| 12 | M/39 | Moderna (first dose) | Ipsilateral | 7/14 | IV | Prominent ipsilateral axillary lymph nodes | WBC 1, protein 76 | IVMP followed by oral prednisolone, gabapentin | Poor recovery by week 8 |
*Values were expressed as cells/μL (WBC) and mg/dL (protein).
†Parsonage-Turner syndrome occurred 2 days after Pfizer vaccination following initial AstraZeneca vaccination.
CSF, cerebrospinal fluid; F, female; IVMP, intravenous methylprednisolone; M, male; MRC, Medical Research Council; ND, not done; NSAIDs, non-steroidal anti-inflammatory drugs; WBC, white blood cell.