This gross laryngocele caused a chronic obstruction of the upper respiratory airway. Diagnosis become obvious because the aggravation of a chronic bronchopathy slightly developed, which run into a cor pulmonale chronic as well. Incidentally linked with a neck metastasis spread out from a hidden papillary carcinoma of the thyroid gland. The laryngocele was treated by extramucous lateral thyrotomy and the carcinoma removed through subtotal thyroidectomy.