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: Pediatrics
[{'content': 'What is the probable diagnosis for a cyst in a child which is located at and associated with vertebral defects – \nSelect and explain. \nA. Myelocele, B. Bronchogenic cyst, C. Neuroenteric cyst, D. Neuroblastoma', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Vertebral defect in association with intraspinal cyst suggest the diagnosis of neuroenteric cyst.\nAny cyst in mediastinum (posterior), abdomen or intraspinal, in association with vertebral defect, suggest the diagnosis of neuroentric cyst.\n\nNeuroenteric cysts\nThese cysts result from incomplete separation of the notochord from the foregut which causes a persistent communication or adhesion between the ectoderm of spinal cord and endoderm of the foregut.\n\nThe lining epithelium of these cysts are endodermal in origin.\nThese cysts are associated with -\n\n\nVertebral anomalies (most common) → Hemivertebrae, spina bifida, fused vertebrae, absent vertebrae, diastematomyelia.\nIntestinal anomalies → Duplication, malrotation, imperforate anus.\nOthers → Cloacal / bladder exstrophy, renal agenesis.\n\n\nMost of the neuroenteric cysts are located -\n\n\nIntraspinal → MC at cervicothoracic region.\nMediastinum → MC in Posterior mediastinum on right side.', 'role': 'assistant'}]