Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Grades of idiopathic retinal periphlebitis in young adults (n = 17) and association with tumor necrosis factor-α levels (pg/ml)
| Grades | Description | Tumor necrosis factor-α |
|---|---|---|
| Grade 1 (n = 4) | Periphlebitis of small caliber vessels with superficial retinal hemorrhages | 14.3–16.2 |
| Grade 2 (n = 5) | Periphlebitis of large caliber vessels with superficial retinal hemorrhages | 15.1–19.8 |
| Grade 3 (n = 8) | Periphlebitis of large caliber vessels with macular edema | 19.2–22.4 |
| Grade 4 | Central periphlebitis | – |
