Laryngeal papilloma in children is a frequent disease caused by human papilloma virus (HPV) type 6 or type 11. This disease has a tendency to recur and the changes are histologically benign. In some cases papilloma may affect the lower levels of the respiratory tract. In this study, among 90 patients treated for laryngeal papillomatosis, in four children papilloma of trachea, bronchi and lung tissue were detected in endoscopic and radiological examination. This constitutes 4.4% of all patients. Compact nodules and acquired cysts between 5 and 50 mm long were found in chest X-rays and in computerised tomography. These cysts appeared from 4 to 8 years after establishing a diagnosis of laryngeal papilloma, and 1 year after recognising papilloma in the trachea. In all four children the presence of nodules and cysts in the lungs was preceded by recurrent pneumonia, emphysema or atelectasis of the lungs. All children with laryngeal papillomatosis should have a chest X-ray. Detection of acquired cyst-like changes in lung tissue in children with laryngeal papillomatosis is a warning of future papilloma in the trachea and bronchi, with involvement of lung tissue. In differential diagnosis of these changes in the lungs we should take into consideration the presence of papilloma in the bronchi. A prognosis of papillomatosis in the lower airways in children is always serious.