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A laryngeal cleft or laryngotracheoesophageal cleft is a rare congenital abnormality in the posterior laryngo-tracheal wall.〔 〕 It occurs in approximately 1 in 10,000 to 20,000 births.〔 〕 It means there is a gap between the oesophagus and trachea, which allows food or fluid to pass into the airway.〔 〕 ==Symptoms and diagnosis== Diagnosis of a laryngeal cleft in an infant often comes after problems with feeding which include coughing, cyanosis (blue skin) and failing to gain weight over time.〔 Pulmonary infections are also common.〔 〕 The longer the cleft is, the more severe the symptoms. A cleft is diagnosed through endoscopic examination, specifically microlaryngoscopy and bronchoscopy.〔〔 〕 Laryngeal clefts are classified into four types according to length. Type I extends no further down than the vocal cords, type II extends below the vocal cords and into the cricoid cartilage, type III extends into the cervical section of the trachea and type IV extends the furthest—into the thoracic section of the trachea.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「laryngeal cleft」の詳細全文を読む スポンサード リンク
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