What can be the cause of hypoglossal nerve palsy?

A middle-aged male patient with mild hypertension presented with thinning of half of his tongue and limitation in tongue movement that started 1 month ago. Neurological examination showed weakness and wasting on the left half of the tongue and a deviation to the left side, towards the outside of the mouth. The rest of the neurological examination was normal (figure 1). Figure 1 Left deviation of the protruded tongue. What is the most likely cause of hypoglossal nerve palsy? 1. Glomus jugulare tumour. 2. Carotid artery …