| SNR | selective nerve root [block]; signal-to-noise ratio; substantia nigra zona reticulata; supernumerary... |
|---|---|
| SRP | short rib-polydactyly [syndrome]; signal recognition particle; Society for Radiological Protection; ... |
| SRPS | short rib-polydactyly syndrome |
| URC | upper rib cage; utilization review committee |
| LSB | Left Sternal Border |