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第一腮裂畸型很少见,约占所有腮裂畸型的1％。第一腮裂畸型是在胚胎发育中残余发展形成的。其特点是:瘘口或囊肿的出现必须在耳垂下方至舌骨联线的平面,不会低于舌骨。分泌物为稀薄脓样,皮脂样或豆渣样。其内衬是来自外胚叶上皮可有毛囊、汗腺、皮脂腺,透明软骨。我们经治第一腮裂囊肿,瘘各一例报告如下: 例1,女,17岁。右耳下肿物8年。初时蚕豆大小,缓慢增大,无任何不适。查:右耳下有一肿物2.5cm~3,无触痛,中等硬,光滑,活动度好,和皮肤不粘连,局麻行肿物切除,为囊性肿物。内有大米汤样液体,有白色粘稠豆渣样物沉淀囊底。蒂粗坚韧,深达外耳道下壁外端。从外听道软骨处切断。蒂长2cm,内径0.3cm,韧硬,内有软骨手皮下。肉眼见蒂内衬为皮
The first cheek split is rare, accounting for about 1% of all cheek defects. The first cheek split is formed during remodeling of the embryo. Its characteristics are: the appearance of fistula or cyst must be below the earlobe plane to the line of hyoid bone will not be lower than the hyoid bone. Secretion of thin purulent, sebaceous or okara-like. The lining is derived from the epiblast epithelial hair follicles, sweat glands, sebaceous glands, hyaline cartilage. We rule the first cheek cleft cyst, fistula, a case report as follows: Case 1, female, 17 years old. Right ear tumor for 8 years. Broad bean size initially increased slowly, without any discomfort. Check: there is a tumor under the right ear 2.5cm ~ 3, no tenderness, moderate hard, smooth, good mobility, and the skin does not adhesion, local anesthetic tumor resection for cystic masses. There are liquid rice soup, a white sticky residue sample sediment bottom. Di rough tough, deep outside the outer wall of the outer ear canal. Cut off from the external auditory canal cartilage. Pedicle length 2cm, diameter 0.3cm, tough, there are cartilage subcutaneous. The naked eye see pedicle lining