THORACIC IMAGING: Pictorial EssayPulmonary Tuberculosis: CT and Pathologic CorrelationLee, Ji Yeon; Lee, Kyung Soo; Jung, Kyung-Jae; Han, Joungho; Kwon, O Jung; Kim, Jhingook; Kim, Tae SungAuthor Information From the Departments of Radiology (J. Y. Lee, K. S. Lee, K. J. Jung, T. S. Kim), Diagnostic Pathology (J. Han), and Thoracic Surgery (J. Kim), and the Division of Pulmonary and Critical Care Medicine (O. J. Kwon), Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul 135-710, Korea. The authors received the Certificate of Merit award at the 1999 meeting of the Radiological Society of North America. Address correspondence and reprint requests to Dr. K. S. Lee, Samsung Medical Center, 50, Ilwon-Dong, Kangnam-Ku, Seoul, 135-710, Korea. E-mail: firstname.lastname@example.org Journal of Computer Assisted Tomography: September-October 2000 - Volume 24 - Issue 5 - p 691-698 Buy Abstract Typical CT findings of active postprimary pulmonary tuberculosis include centrilobular nodules and branching linear structures (tree-in-bud appearance), lobular consolidation, cavitation, and bronchial wall thickening. The CT findings of inactive pulmonary tuberculosis include calcified nodules or consolidation, irregular linear opacity, parenchymal bands, and pericicatricial emphysema. The typical appearance of primary tuberculosis on CT scans is homogeneous, dense, well-defined segmental or lobar consolidation with enlargement of lymph nodes in the hilum or the mediastinum. Miliary nodules may be seen in primary and postprimary tuberculosis. On CT, tuberculomas appear as a nodule with surrounding satellite nodules and internal cavitation on CT. Atypical radiologic manifestations of tuberculosis, encountered in as many as one third of the cases of adult-onset tuberculosis, are single or multiple nodules or masses, basilar infiltrates, miliary tuberculosis with diffuse bilateral areas of ground-glass opacity, and reversible multiple cysts. Underlying histopathologic findings of typical and atypical CT findings of tuberculosis are caseating granulomas or pneumonia in the active phase and fibrosis and dystrophic calcification in the inactive phase. Copyright © 2000 Wolters Kluwer Health, Inc. All rights reserved.