| PLES | parallel-line equal space |
|---|---|
| PTA | parallel tubular arrays; parathyroid adenoma; percutaneous transluminal angioplasty; peroxidase-labe... |
| NFL | nerve fiber layer; neurofilament protein, light polypeptide |
| NFLD | nerve fiber layer defect |
| CSN | cardiac sympathetic nerve; carotid sinus nerve |