title: Malignant transformation in non-irradiated recurrent respiratory papillomatosis.
abstract: The clinical, radiographic and post mortem findings occurring in a 6-year-old female with a four-year history of recurrent respiratory papillomatosis (RRP) are described. At autopsy, there were two separate foci of malignant transformation (malignant degeneration) in the bronchioloalveolar papillomata. This patient is the youngest in whom such changes have been described. Malignant transformation is a rare occurrence and is usually seen in older patients with longstanding papillomatosis, therapeutic irradiation, or a history of smoking. Pulmonary spread represents the majority of cases with "spontaneous" malignant transformation.
mesh_terms: D000367:Age Factors; D001344:Autopsy; D001980:Bronchi / Q000473:pathology; D002277:Carcinoma / Q000473:pathology; D002294:Carcinoma, Squamous Cell / Q000473:pathology; D002471:Cell Transformation, Neoplastic / Q000473:pathology; D002648:Child; D005260:Female; D006801:Humans; D007822:Laryngeal Neoplasms / Q000473:pathology; D008175:Lung Neoplasms / Q000000981:diagnostic imaging / Q000473:pathology; D009362:Neoplasm Metastasis; D009364:Neoplasm Recurrence, Local; D009378:Neoplasms, Multiple Primary; D010212:Papilloma / Q000000981:diagnostic imaging / Q000473:pathology*; D011650:Pulmonary Alveoli / Q000473:pathology; D011859:Radiography; D012142:Respiratory Tract Neoplasms / Q000000981:diagnostic imaging / Q000473:pathology*