Practical Anæsthetics

there is often a very great overgrowth of smooth muscle in the wall of the cysts, so that the tissue almost has the appearance of a leiomyoma. This would tend to point to a developmental origin, and that cystic disease of the lung in the infant really is congenital. It is of some interest to note that this case shows mediastinal shift to the right: in a series of eleven cases reviewed by Young and Oswald, all lungs showing marked mediastinal displacement (five cases) were cystic on the left side, as is this case. SUMMARY. A case of congenital cystic disease of the lung is described. Emphasis is laid on the fact that diagnosis rests on radiological grounds aided by a careful history; and the ease with which-the condition may be confused with inflammatory conditions , including empyema, before X-ray evidence is available. The possibility of the condition being acquired and not congenital is considered.