“…Early descriptions of the histology include those of Putkonen (1945), Rogers and Haserick (1954), Siltzbach and Ehrlich (1954), James and Thomson (1955), Nelson (1957), andSteigleder et al (1961). lt is generally agreed that the typical reaction, consisting in well-formed tuberculoid collections of epithelioid cells with or without giant cells, and with limited or negligible lymphocytic infiltration, begins to develop within two weeks but does not attain a fully characteristic appearance until later .…”