In this booklet a short but clear and well arranged survey is given of the problems arising from the coincidence of diseases of nontuberculous origin with an active tuberculosis. The main complications and their therapeutic management are given from the standpoint of treatment of the tuberculosis as well as of the complication. The book will be of value to the general practitioner as a source of quick orientation about the many problems that may arise. It is not comprehensive enough for the specialist. A rich and well arranged bibliography is added, which will aid those who desire more detailed information.