Urethral occlusion due to urinary calculi or mucous plugs is a serious and fairly common problem of the male cat. Surgical treatment of urethral obstruction cases usually involves removal of the obstruction and relief of urine retention.
Silberhorn, T. A.
"Feline Urethral Obstruction,"
Iowa State University Veterinarian: Vol. 33
, Article 10.
Available at: https://lib.dr.iastate.edu/iowastate_veterinarian/vol33/iss1/10