Tracheocele is a rare pathology, especially complication of tracheal surgery. We present a case of a 3 year old pediatric patient with secondary tracheocele arising after simple surgical closure of tracheostomy. It appeared 2 months after intervention that cervical mass swelling during respiratory acts. Diagnosis was made by TC scan and by dynamic flexible bronchoscope which revealed a substomal segmental tracheomalacia. Surgical procedure consisted of simple excision of tracheocele associated with enhancing tracheomalacic segment by free graft of costal cartilage as Cotton procedure. Follow up at 14 months demonstrated a patent of cervical trachea without any sign of malacia.