Type II cystic adenomatoid malformation: late diagnosis in a patient with a pulmonary mass

We hereby report the case of a 22-year-old patient with a final diagnosis of type II cystic adenomatoid malformation, who was hospitalized due to repeated pulmonary infections. The radiographic study demonstrated a worrying image of a pulmonary mass. The different studies performed, did not put forward the diagnosis, so at last the patient was proposed a thoracotomy for diagnostic and therapeutic purposes.