[Duplication of the vermiform appendix]

Duplication of the vermiform appendix is a very rare anomaly that should be considered and suspected in patients who have previously undergone an appendectomy and present with low right quadrant abdominal pain, alongside other differential diagnoses such as stump appendicitis and cecal diverticulitis. In previously known cases, appendix duplications have been missed on computed tomography and ultrasound examinations, illustrating the difficulty with diagnosis. Sometimes, duplication of the appendix is associated with other teratological phenomena in the gastrointestinal tract and the genitourinary system, which is why previous medical history or records from pediatrics can be of clinical value. A missed diagnosis can lead to increased morbidity and mortality.