A 15-year-old cat is presented with a three week progression of wandering in circles to the left, standing in corners, and dull mentation. Conscious proprioceptive deficits (knuckling) can be elicited in the right thoracic and right pelvic limbs. There is a decreased menace response on the right, but palpebral and pupillary light reflexes are normal in both eyes. The rest of the examination is normal. A brain tumor is suspected. Where is the most likely location of the lesion?
一只15岁大的猫在过去3周出现进行性的向左转圈运动，站在墙角以及呆滞等情况。右前肢和右后肢出现意识性本体感受缺失（关节）。右眼威胁反射减弱但双眼眼睑反射以及瞳孔对光反射正常。其余的检查都正常。怀疑这只猫有脑部肿瘤。最可能的病变位置在哪里？
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