Answer 7

The neurological signs suggest a lesion of the left facial nerve which provides motor innervation to the muscles of facial expression (ear, eyelids, nose, cheeks and lips). In the absence of other neurological signs, a lesion of the peripheral nerve rather than the facial nerve nucleus in the brainstem is more likely as the later is usually associated with brainstem signs such as ipsilateral paresis and postural reaction deficit, decreased mentation, central vestibular signs and other cranial nerve deficits. Main differentials include idiopathic facial nerve paralysis, otitis media and middle ear tumour.

To learn more about Neurology click here