| MIR | multiple isomorphous replacement |
|---|---|
| MVR | massive vitreous reaction; microvitreoretinal; minimal vascular resistance; mitral valve replacement... |
| NGR | narrow gauze roll; nasogastric replacement |
| PORP | partial ossicular replacement prosthesis |
| PVR | peripheral vascular resistance; perspective volume rendering; poliovirus receptor; postvoiding resid... |