| OAISO | overaction of the ipsilateral superior oblique |
|---|---|
| PASVR | pulmonary anomalous superior venous return |
| RNSC | radionuclide superior cavography |
| RSO | radiation safety officer; Resident Surgical Officer; right superior oblique [muscle] |
| RSR | regular sinus rhythm; relative survival rate; right superior rectus [muscle] |