临床思考病例（１９）答案该病例虽然有明显的鞍底、蝶窦及斜坡骨质的广泛破坏，从而使人不得不考虑恶性病变．但病史长达３年，一般情况好，除左外展神经受损外基本无神经系统阳性体征；抗ＥＢ病毒抗体检查阴性；ＣＴ扫描发现肿块呈圆形，以蝶窦为中心向四周均匀扩展，而... Cases of clinical thinking (19) The answer Although the case has obvious extensive destruction of the base of the saddle, sphenoid sinus, and slope bone, people have to consider malignant lesions. However, the medical history was as long as 3 years. The general situation was good. There were no neurological positive signs except for the left abducent nerve. The anti-EBV antibody test was negative. The CT scan showed a circular tumor with a sphenoid sinus as the center. ,and...