Thank you for posting your query.
Based on the symptoms, I would think of a posterior circulation stroke
as the first diagnosis. In this condition, there may be lack of blood flow in brainstem
Regarding the normal MRI, it happens in some cases. However, a repeat MRI later would show the infarct (blood clot).
Regarding pituitary swelling, it is likely to be a small adenoma (benign tumor
), which can be confirmed with contrast scan. In any case, her symptoms are not related to the pituitary swelling.
Dr Sudhir Kumar MD DM (Neurology)
Senior Consultant Neurologist