Injury of the facial nerve is a distressing complication of infection of the mastoid and of mastoidectomy. Gowers1 stated:
In complete facial palsy, the muscles of the affected half of the face become toneless and immobile. In all movements, voluntary or emotional, the affected half of the face is still. The two sides of the face present a strange incongruity and the smile or frown deprived of half its range loses more than half its character so that it is difficult to recognize the expressional significance of the distorting contractions of the cheek and brow which occur on the unaffected side.
The work of Ney2 and later that of Ballance and Duel3 have shown that the injured or completely interrupted facial nerve can be readily exposed in its canal. Depending on the lesion found, it can be decompressed or an end to end suture can be done or a briding
HUTCHISON K. PARALYSIS OF THE FACIAL NERVE: REPORT OF A CASE. Arch Otolaryngol. 1937;26(2):200–202. doi:10.1001/archotol.1937.00650020216010
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