Abstract
Aims & Objectives: To show sonographic appearance of larynx before and after aspiration of a pre-epiglottic cyst. Methods Airway ultrasound (US) was performed to asses the airway to find a cause of stridor. We used a high frequency (7.5 MHz), linear transducer of Aloka SSD-90 machine. The patient was in supine position with the neck a little extended, to facilitate the probe. Axial images were taken by putting the probe at the level of hyoid and thyroid cartilage. Images were obtained at two time points, pre and post aspiration. The findings were confirmed on CT scan of the neck. Results A well-defined hypodense round mass measuring 3 × 3 cm with regular margins was seen pre-surgery (left panel figure 1). The margin is very thick and hyperechoic because it is formed by thyrohyoid membrane anteriorly(upper margin); pre-epiglottic space with air-mucosal interface posteriorly(lower margin). This mass obscured laryngeal structures like vocal cords, glottis and arytenoid cartilage. After aspiration of the cyst these structures became visible (right panel figure 1). Conclusions Airway US is a very useful investigation for quick diagnosis of mass lesions of the larynx and epiglottis in children presenting with stridor.
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