Testicular Torsion Following MMR Vaccination in an 18-Month-old Infant: A Case Report

Introduction: The measles, mumps, and rubella (MMR) vaccine is associated with known complications, such as salivary gland involvement and aseptic meningitis. Isolated reports of epididymal orchitis following MMR vaccination have also been reported, but no reported case of testicular torsion in infancy has been explicitly attributed to the MMR vaccine. Objective: Here, we report an 18-month-old male infant presented with a history of gradually worsening painful left scrotal swelling following a booster dose of MMR that finally led to orchiectomy with the diagnosis of testicular torsion. Case Presentation: An 18-month-old male infant presented with a one-day history of gradually worsening painful left scrotal swelling following a booster dose of MMR. No evidence of blood flow was detected in the left testicle in color Doppler sonography, which was compatible with testicular torsion. In surgical exploration, the left testicle seemed firm and dark in color. The spermatic cord vessels were thrombotic in appearance, and the testicular appendix seemed completely necrotic. The nonviable left testicle was removed. Conclusions: Although testicular torsion after MMR vaccination is rare, in the case of any pain, swelling, and redness of the scrotum, the patient should seek an urgent medical consultation. Physicians should be aware that testicular swelling after the MMR vaccine might not be just epididymal-orchitis but really a medical emergency.