| OMPA |
octamethyl pyrophosphoramide; otitis media, purulent, acute |
| OMPC, OMPCh |
otitis media, purulent, chronic |
| OMSA |
otitis media, suppurative, acute |
| OMSC |
otitis media secretory (or suppurative) chronic |
| EVR |
evoked visual response; exudative vitreoretinopathy |
