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Background: A double appendix, also known as vermiform appendix duplex, is a rare anomaly in humans, with a reported incidence of 1 in 25,000. The rarity of vermiform appendix duplication makes it a noteworthy medical occurrence. Approximately 100 reported cases have been documented since the first observed case in 1892. There are multiple types of appendiceal duplications, some of which include duplications of other organs.Case Report: A 10-year-old boy was diagnosed with acute appendicitis by clinical examination and ultrasound. He underwent a laparoscopic appendectomy and had an unremarkable recovery. His pathology revealed acute suppurative appendicitis. Two months later, he presented to the emergency department due to bilateral lower abdominal pain with guarding and distension on examination. He underwent a computed tomography of the abdomen and pelvis secondary to concern for a postoperative abscess, which instead showed a normal-appearing retrocecal appendix containing oral contrast. The patient was diagnosed with constipation, and his symptoms resolved with an enema. Our patient had two completely separate appendices, one arising from the cecal tinea coli, and one retrocecal. Why Should an Emergency Physician Be Aware of This? Clinicians should be aware of this rare anomaly as a potential diagnosis in a patient with a history of prior appendectomy and clinical signs consistent with recurrent appendicitis. This also underscores the need for communication between doctors and patients, along with their families, to avoid delays in diagnosis in the future. [ABSTRACT FROM AUTHOR]

• Duplicated Appendix may be associated with imperforate anus. • Duplicated Appendix may be associated with Situs Inversus Totalis. • Complete duplication of an appendix on the normal site is possible. • Patients with congenital anomalies need thorough evaluation for other associated anomalies. Duplicated appendix is an uncommon entity, typically discovered as an incidental finding during surgery for appendicitis or other abdominal pathologies. It may be associated with other congenital malformations. We report a case of a male neonate incidentally discovered to have an unrecognized variant of duplicated appendix during a laparotomy plus diversion colostomy for imperforate anus at 4 days of age. A baby delivered at home from an unbooked pregnancy at term, was referred from a primary care clinic to a specialist referral hospital, with a fever and suspected neonatal sepsis on day 1 of life. The patient had not passed meconium and physical examination revealed an imperforate anus. After initiating treatment for sepsis, the patient underwent a laparotomy where a situs inversus totalis and complete appendiceal duplication was found, with both appendices on the normal site of a single caecum. The appendices were left in situ and a diversion colostomy was performed. The patient did well following surgery and was discharged on postoperative day 10 to await definitive surgery. Appendiceal malformations have been reported either in isolation or in association with other congenital anomalies. Duplicated appendix occurs rarely and the pathogenesis is not fully understood. This case adds more evidence that the classification of appendiceal abnormalities should continue evolving as newer types are described. Surgeons operating on patients with congenital anomalies must exercise extreme vigilance to identify and document other rare pathologies that may later pose challenges thus avoid morbidity, mortality and potential medicolegal pitfalls. [ABSTRACT FROM AUTHOR]

Cloacal and bladder exstrophy are rare embryological defects that can cause developmental disruption of surrounding organ structures, the pelvis, spinal cord, and small intestines being the most commonly affected. Duplicated appendix is another rare embryological defect that has historically caused confusing clinical presentations. Our case highlights a rare instance of a patient with cloacal exstrophy who presented with a bowel obstruction and an associated inflamed duplicated appendix. A newborn male is born with omphalocele-exstrophy-imperforate anus-spinal defects (OEIS) complex. As primary surgical reconstruction was pursued, the patient was found to have a non-inflamed duplicated appendix, which was left unremoved. In the following months, the patient experienced episodes of small bowel obstruction, eventually requiring surgical intervention. During this operation, the duplicated appendix was noted to be inflamed, prompting removal of both appendices. This case highlights the increased prevalence of duplicated appendix in a patient with cloacal exstrophy, as well as the utility of prophylactic appendectomy for patients incidentally found to have a duplicated appendix intraoperatively. The duplicated appendix may lead to increased rates of complications and atypical presentation of appendicitis, supporting the practice of prophylactic appendectomy in patients with an incidentally found duplicated appendix. We suggest clinicians be aware of the association and potentially atypical presentation of appendicitis in patients with a duplicated appendix, particularly in the setting of cloacal exstrophy. The decision to prophylactically remove an incidentally found, non-inflamed duplicated appendix may be beneficial in preventing confusing clinical presentations and future complications. • Acute appendicitis commonly effects pediatric patients • Bladder and cloacal exstrophy are associated with developmental abnormalities, such as a duplicated appendix • A duplicated appendix may cause confusing clinical presentations and complications such as bowel obstruction • If a duplicated appendix is incidentally identified, clinicians should consider prophylactic removal of both [ABSTRACT FROM AUTHOR]

Duplex appendix is a rare anatomical entity with incidence rate of 0.004 and 0.009%. Diagnosis is often missed despite growth in radiological investigations. Missed appendiceal anomalies can lead to undesirable medicolegal implications. Here we discuss a case of a 76-year-old-male who initially presented to his primary care physician with right-sided abdominal pain for several weeks. A colonoscopy was performed and demonstrated a lesion arising from the appendicular orifice. The patient underwent staging imaging including Computerised Tomography of the abdomen and pelvis which demonstrated a dilated appendix. The patient underwent a laparoscopic right hemicolectomy. He made an uneventful recovery post-operatively and at his follow-up review at 4 weeks and 2 months. While duplex appendix has been reported in the literature, to our knowledge this is the first case report to describe duplicated appendix presenting as a colonic mass in an elderly patient. Intra-operative examination of the cecum is paramount to rule out appendiceal anomalies and prevent medicolegal complications. • Duplex appendix is a rare entity with incidence rate of 0.004–0.009%. • Diagnosis of duplicated appendix is often missed despite growth in radiological investigation. • Missed appendiceal anomalies can lead to undesirable medicolegal implications. • Intra-operative examination is the only reliable option to rule out appendiceal anomalies. [ABSTRACT FROM AUTHOR]