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': 'Commonest site of meningocele is \nSelect and explain. \nA. Lumbosacral, B. Occipital, C. Frontal, D. Thoracic', 'role': 'user'}, {'content': 'Answer: A \nExplanation: • Herniation of meninges through a defect in the posterior vertebral arches.\n• Spinal cord is usually normal and assumes a normal position in the spinal canal\n• There may be tethering, syringomyelia, or diastematomyelia.\nClinical Features\n• A fluctuant midline mass, that may transilluminate occurs along the vertebral column, in the lower back.\n• Most meningoceles are well covered with skin and pose no threat to the patient.\n• Anterior meningocele: Projects into pelvis through a defect in the sacrum.\n• Symptoms of constipation and bladder dysfunction develop due to the increasing size of the lesion.\nDiagnosis\n• Plain roentgenograms demonstrate a defect.\nTreatment\n• Asymptomatic children with normal neurologic findings and full-thickness skin covering the meningocele may have surgery delayed.\n• Patients with leaking CSF or a thin skin covering should undergo immediate surgical treatment to prevent meningitis.', 'role': 'assistant'}]