You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is A patient presents with diplopia with limitations of adduction in the left eye and abducting saccade in the right eye. Convergence is preserved. Most likely etiology is: and explain in detail?
B. i.e. Internuclear opthalmoplegia In type III internuclear opthalmoplegia, none of the eyes abduct completely while the adduction is complete (Le. normal convergence)Q. Dissociated Opthalmoplegia There is dissociation in gaze movements i.e. one eye moves in one direction whereas the other eye cannot move in the same direction. Internuclear Opthalmoplegia (INO) Medial longitudinal Fasciculus (MLF) connects 3rd and 6th nerve nuclei. A lesion in MLF produces INO and prevents harmonious coordination of these nuclei in producing conjugate (both eye moving in same direction)" movements. Etiologies may be Unilateral Bilateral - Vascular lesion or infarct of small branch - Multiple sclerosis (m.imp) of basilar aery (m.imp) - Neoplasm - Brain stem tumors - Inflammation - Multiple sclerosis - Myasthenia gravis - Myasthenia gravis - Occlusive vascular disease - Cryptococcosis