Sluggishness and feelings of weakness. It goes without saying that control of all muscular movement is sited within the motor region of the cerebral cortex. The motor cortex in each side of the brain generally controls the opposite side of the body. For example, if you were to move your right hand, it would be controlled by the left side of the brain, and vice versa.
A tumor sited in, or even near, the motor cortex, or anywhere along the neural pathways to the affected limb, will affect the function of that limb, eventually resulting in complete dysfunction. Even if a brain tumor does not cause discomfort in the limbs, one may find that the actual function of those limbs is severely impaired, or even totally absent.