This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Surgery
[{'content': "Which of the following is TRUE about Zenker's diverticulum - \nSelect and explain. \nA. It is asymptomatic, B. Occurs in the mid-esophagus, C. Treatment is simple excision, D. It occurs in children", 'role': 'user'}, {'content': 'Answer: C \nExplanation: Zenker\'s or Pharyngo-esophageal diverticula\n\nZenker\'s diverticula are mucosal outpouchings occurring through the triangular bare area (Killian\'s triangle) between the upper oblique fibres (also known as thyropharyngeus muscle) and lower horizontal fibres (also known as cricopharyngeus muscle) of the inferior constrictor muscle.\nThe underlying pathology is neuromuscular incoordination in this region \nZenker\'s diverticulum is a pulsion diverticulum.\nEsophageal Diverticula are of two types: pulsion & traction\n\nIn pulsion diverticulum, increased intraluminal pressures (secondary to abnormal esophageal motility) push the mucosa and submucosa through a muscular defect in the wall of the esophagus creating a pulsion diverticulum. It\'s not true diverticula (not containing all the layers of the esophageal wall)\nIn traction diverticula extraluminal forces (like inflammed & scarred peribronchial & mediastinal lymph nodes) pull the full thickness of the esophagus out, creating true diverticula.\n\nZenker\'s is the most common esophageal diverticula.\nThe diverticula arise posteriorly in the midline of the neck. The mouth of the diverticula is in the midline but the sac projects laterally (usually left laterally)\nZenker\'s diverticula are rarely seen below 30 yrs of age, most patients are over 50.\nDysphagia is the most common symptom.\nUndigested food is regurgitated into the mouth, especially when the patient is in the recumbent position.\nSwelling of the neck, gurgling noises after eating, halitosis (bad mouth odour) and a sour metallic taste in the mouth are common symptoms.\nBarium swallow is diagnostic\nManagement (Maingot\'s 11/e chapter 8; Sabiston 18/e p1062; Schwartz 9/e p848)\nSurgical therapy is the treatment of choice. Methods used are:\n\n\nCricopharyngeal myotomy - a myotomy alone is usually sufficient for small diverticula (<2cm).\nMyotomy with Diverticulopexy\n\nthe larger diverticulum may be sutured in the inverted position to the prevertebral fascia using a permanent suture (i.e., diverticulopexy).\nDiverticulopexy avoids the complication of infection due to leak from a resected diverticulum (diverticulectomy)\n\nMyotomy with excision of sac - done for large (> 5 cm) diverticula\n\nIf the diverticulum is excessively large so that it would be redundant if suspended a diverticulectomy should be performed.\n\nDiverticula-esophagostomy using a linear cutting staple gun\n\nthe septum between the esophagus and the diverticula\xa0 is divided also known as Dohlman procedure the advantage is that it takes less time to complete, does not require an incision, and therefore may have less morbidity. This is an important consideration since this disease most commonly presents in the elderly.\xa0\nThis procedure is effective for diverticula >2 cm and may be impossible to perform for the small diverticulum. Sabiston writes- " For these reasons, this technique has gained favour and is advocated in patients with diverticula between 2 and 5 cm."', 'role': 'assistant'}]