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: Orthopaedics
[{'content': 'Hari Verdhman, 9 yrs old child, presents with scoliosis, hairy tuft in the skin of the back and neurological deficit. Plain X- rays reveal multiple vertebral anomalies & a vertical bony spur overlying lumbar spine on AP view. The most probable diagnosis is - \nSelect and explain. \nA. Dorsal dermal sinus, B. Diastometamyelia, C. Tight filum terminale, D. Caudal regresion syndrome', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Diastometamyelia \n\nIs division of the spinal cord into two halves by projection of a fibrocartilaginous or bony septum (spur)\nThe defect involves lumbar vertebrae (L1 to L3) in 50% of cases.\nAbnormalities of vertebral bodies include fusion defects, kyphoscoliosis, spina bifida and myelomeningo coele.\nMidline abnormality of the skin provides a clue.\nInitial features may occur from infancy to young adulthood.\nNeurological signs are thought to result from flexion and extension movements of the cord which produce traction and additional trauma by the septum.\nTreatment of the symptomatic patients is excision of the bony spur or septum.', 'role': 'assistant'}]