Which of the following is not a feature of extramedullary tumour?: (A) Early Coicospinal signs and paralysis, (B) Root pain or midline Back -pain, (C) Abnormal CSF, (D) Sacral sparing
Answer is D. Sacral sparing is a feature of intramedullary tumors, not extra medullary tumors. So sacral sparing is the single best answer of choice. Ref: Harrison's Principles of Internal Medicine, 16th Edition, Page 2440