The majority of articles on the malformations of the external ear have been published in European journals and comparatively few are in the English language. Most of these papers are limited to a report of an isolated case. Still more rare is the paper that deals with the ear in which all of the components are present but which are shaped so that the ear protrudes abnormally from the head. This deformity is commonly designated as a "lop ear" or "bat ear." The present article calls attention to this abnormality with especial emphasis on the explanation of the embryologic development and the surgical correction.
The external ear arises from six distinct tubercles and a ridge of tissue, all of which are grouped around the dorsal limit of the first branchial groove, which in turn gives rise to the external auditory canal. Three of these primordia are derived from the
MacCOLLUM DW. THE LOP EAR. JAMA. 1938;110(18):1427–1430. doi:10.1001/jama.1938.02790180015005