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Categorization of perilymphatic fistula according to etiology based on a nationwide study by Matsuda et al. (23).
| Category 1 | Linked to trauma, middle and inner ear diseases, middle and/or inner ear surgeries |
| Category 2 | Linked to barotrauma caused by antecedent events of external origin (such as flying or diving) |
| Category 3 | Linked to barotrauma caused by antecedent events of internal origin (such as straining, sneezing, or coughing) |
| Category 4 | Has no apparent antecedent event |
