Non-gonococcal urethritis is not a syndrome or a well- defined disease.
[stdpioneer.org]
This book discusses as well the etiology, pathology, and treatment of various diseases of the urethra, including acute urethritis, stricture of the urethra, periurethritis
[books.google.de]
The term is typically reserved to describe urethral inflammation caused by a sexually transmitted disease (STD), and the condition is normally categorized as either gonococcal
[emedicine.medscape.com]