Lipomas or fatty tumors are probably the commonest benign tumors that are encountered in surgical dispensaries. They sometimes develop in children, but much more commonly in adults. The solitary forms are much commoner than the multiple or diffuse. They may be found upon any portion of the body. They vary greatly in size, from being almost microscopic to a weight of several pounds. They have their origin in the subcutaneous fatty tissue. There are several types-the solitary, the multiple, and the diffuse. The latter condition is often spoken of as "fatty neck." Lipomas do not become malignant, and are not dangerous in any sense, but are rather unsightly. They may be easily removed by surgical interference, and do not recur if completely removed.