Abstract
A study was made to determine the frequency with which mycelial structures of C. immitis could be found in resected focalized lesions. Mycelial growth developed in focalized and stabilized lesions in the human host in the same manner that it developed in cultures. Hyphae were more commonly found in cavities than in granulomatous lesions. There was no relationship between mycelial growth and a negative reaction to intradermal coccidioidin.