CYST OF LUNG ASSOCIATED WITH ANOMALOUS PULMONARY ARTERY

ALTHOUGH anomalous pulmonary arteries have long been recognized,¹ the first description of such a vessel associated with sequestration of the lung is credited to the unpublished thesis of Fischer, cited by Müller in 1927.² In 1941 Haight³ made brief reference to two cases, and others⁴ have since described isolated instances of this anomaly. With an increasing number of thoracic operations, more material became available, and in 1946 Pryce⁵ reported eight cases and reviewed the literature in detail.

There are several theories as to the origin of the vessel and the sequestrated mass of lung. Pryce^5a has written extensively on the subject, and here only a brief mention is necessary. Embryologically the pulmonary artery develops in a vascular plexus which has connections with both dorsal and ventral aortae (Fig. 1). Because of embryonic shifts the connections to the dorsal aorta are normally disrupted. If there