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AMA Am J Dis Child. 1956;92(2):175-178. doi:10.1001/archpedi.1956.02060030169011.
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DEVELOPMENT and expansion of thoracic surgery has increased the frequency with which tumors and cysts of the thymus are encountered. This has led to greater need for observation and study of anatomy, physiology, and pathology of the thymus in order to elucidate the poorly understood subject of diseases of the thymus.

An unusual lesion of the thymus will be described, and a brief discussion of the pathogenesis with suggestions for future study of thymic cysts will follow.

Report of a Case  History.—A Caucasian girl aged 2 years was admitted to this hospital on July 16, 1955, because of recurrent episodes of acute febrile illness of increasing frequency and severity since their onset at age 10 months. These were characterized by listlessness, fever, severe cough, and cyanosis, initiated by crying.Admission physical examination revealed absence of breath sounds and dullness to percussion over the entire right hemithorax. An x-ray film


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