An intermediate power of a microscopic view of an<unk> . The lesions presents as a nodule or papule, either sessile or pedunculated. They may be soft or have a cartilaginous structure. By histologic examination, it is a recapitulation of normal external<unk> . There will be skin, cartilaginous structures, and cartilage (although the later is not seen in all variants of this disorder). Some investigators believe that the tragus is the only hillock which is derived from the first branchial arch. This is clearly suggestive that true cases of<unk>  represent a true duplication of the hillocks that were part of the second branchial arch. The second ear appears as a mirror image folded forward and lying on the posterior cheek. Differential diagnosis These structures are distinctly different from squamous papilloma and benign teratoma. Classification The several components or degrees of development range from an ear tag, preauricular appendage, preauricular tag, or<unk>  tragus, to supernumerary ears or polyotia. It is a relatively common congenital anomaly of the first branchial arch or second branchial arches. Other anomalies may be present concurrently, including cleft palate, cleft lip, or mandibular hypoplasia. There is a known association with Goldenhar syndrome (oculo-auriculo-vertebral syndrome) and with Wildervanck syndrome. There may also be an association with congenital cartilaginous rest of the neck.
Accessory auricle
Crisscross heart
Mitral facies
Situs ambiguus
Right-sided aortic arch
Double inlet left ventricle
Dextrocardia
Interrupted aortic arch