XLII The Otologist and First Branchial Cleft Anomalies

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Abstract
In 3 cases, the anomalous mass was lateral to the facial nerve and intimately associated with the parotid gland; in 2 it was medial; in 1, the cartilaginous mass was encircled by 2 large branches of VII (first report of this anomaly). In all cases, the external auditory canal was involved, the anomalies were superior to the hyoid bone and related to the parotid gland. A sinus tract extending posterior to the pinna was observed in 1 case. It is believed that this anomaly occurs as a first groove defect beginning perhaps as early as the third to fourth week of embryonic life; cell rests of the first groove are buried on the ventral side of the embryo due to failure of merging of the first and second arches.

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