Solitary bone cysts are common, but serial roentgenograms showing their early rate of growth are not numerous, and seem worthy of publication.
The Institute of Child Welfare of the University of California, in Berkeley. has been closely following the development of certain pupils in schools, and among the methods used is the taking of serial roentgenograms of the left knee. In the course of the routine studies the cyst to be reported was discovered, and the Institute permitted me to use its data.
REPORT OF A CASE
D. C., the boy in question, was a healthy active lad who had successfully weathered the usual childhood diseases. He had had no major accidents and no injury of any kind to the region of the left knee. The first roentgenograms were taken on May 6, 1938, when the boy was 9½ years of age. Both the anteroposterior and lateral views included the