Type of involvement Comments Mucosal erythema and edema Nonspecific finding* Granular mucosa Nonspecific* Cobblestone mucosa More common in lobar and segmental bronchi* Mucosal plaques (yellowish) Also occurs in other disorders* Obstructive sleep apnea, which occurs in about 5% of the general population, seems to occur with increased frequency in patients with sarcoidosis, especially in patients with lupus pernio [18]. Sarcoidosis of the upper airways has been suggested as one of the possible mechanisms for sleep apnea in patients with sarcoidosis and lupus pernio, although the overwhelming majority of obstructive sleep apnea in sarcoidosis is most probably related to obesity from corticosteroids. Sarcoidosis of the supraglottic airways in children is rare [19]. 2.2. Larynx Laryngeal sarcoidosis often occurs as an isolated phenomenon and is usually attributed to asthma [20]. Occasionally, laryngeal sarcoid can lead to progressive life-threatening airway obstruction [15]. Laryngeal sarcoidosis is uncommon [21]. The incidence of laryngeal sarcoidosis is estimated to be about 1.2%. Laryngeal sarcoidosis could be treated with systemic and intralesional injections of a corticosteroid, surgical intervention, carbon dioxide laser ablation, and external beam radiation [22, 23]. Paralysis of the left vocal cord and hoarseness can occur from compression of the left recurrent laryngeal nerve by enlarged lymph nodes [24, 25]. Systemic corticosteroid therapy has resulted in resolution of the hoarseness [24]. 2.3. Central airways The trachea and main bronchi are less frequently affected than the lobar, segmental, subsegmental, and distal airways. Sarcoid granulomas of trachea, main carina, and major bronchi by themselves seldom produce significant obstructive symptoms or airway dysfunction [26, 27]. Cough is the main symptom. Symptoms, clinical examination, flow-volume curves, and bronchoscopy help in assessing the severity of the central airway stenosis [28]. Mainstem bronchial stenoses as well as segmental stenosis have been described in patients with sarcoidosis [29]. Disabling inspiratory and expiratory airflow limitation mimicking fixed upper airway obstruction has been reported [27]. Bronchoscopy may demonstrate other changes as: mucosal erythema, edema, friability, granularity, fine cobblestoning, and sarcoid nodules. The characteristic yellow waxy nodules typical of sarcoidosis are less likely to occur in the trachea and main bronchi, but when seen in these areas, they tend to be sparsely distributed. Extrinsic compression of the central airways by the enlarged mediastinal and hilar lymph nodes is uncommon. Right middle lobe syndrome caused by extrinsic compression and intraluminal sarcoidosis has been described [30]. 2.4. Distal airways Sarcoidosis could affect lobar, segmental, subsegmental, and more distal bronchi as well as bronchioles, which is manifested as mucosal inflammation, endobronchial granulomas, stenosis, extrinsic compression, distortion, bronchiectasis, bronchiolitis, airway hyperreactivity, and streak...