A 70-Year-Old Man Complains of Weakness in His Right Leg

Multiple Choice

A 70-year-old man complains of weakness in his right leg. Physical examination is notable for hyperactive muscle stretch reflexes, a positive Babinski sign, and diffuse areas of weakness in his right leg. Although he can accurately distinguish sharp and dull pain in the right leg he is unable to distinguish these types of pain in his left leg. The most likely cause of these findings is a lesion in the:

A) Cerebellum
B) Internal capsule, left anterior limb
C) Left lateral funiculus
D) Reticular formation
E) Right frontal lobe