May Be Caused by

 Common

Iatrogenic ureteral injury

Instrumentation

Retrograde pyelography

Surgery

Trauma

 Uncommon

Actinomycosis

Carcinoma of cervix

Carcinoma of intestinal tract

Colonic diverticulitis

Crohn disease

Endometriosis

Transitional cell carcinoma

Tuberculosis

Ureteral calculus