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[email protected] 413 CHEST IMAG ITMIG Classification of Mediastinal Compartments and Multidisciplinary I Approach to Mediastinal Masses1 NG Brett W. Carter, MD Marcelo F. Benveniste, MD Division of the mediastinum into specific compartments is ben- Rachna Madan, MD eficial for a number of reasons, including generation of a focused Myrna C. Godoy, MD, PhD differential diagnosis for mediastinal masses identified on imag- Patricia M. de Groot, MD ing examinations, assistance in planning for biopsies and surgical Mylene T. Truong, MD procedures, and facilitation of communication between clinicians Melissa L. Rosado-de-Christenson, MD in a multidisciplinary setting. Several classification schemes for Edith M. Marom, MD the mediastinum have been created and used to varying degrees in clinical practice. Most radiology classifications have been based Abbreviations: FDG = fluorodeoxyglucose, on arbitrary landmarks outlined on the lateral chest radiograph. A ITMIG = International Thymic Malignancy In- terest Group, JART = Japanese Association for new scheme based on cross-sectional imaging, principally multi- Research on the Thymus, SUVmax = maximal detector computed tomography (CT), has been developed by the standardized uptake value International Thymic Malignancy Interest Group (ITMIG) and RadioGraphics 2017; 37:413–436 accepted as a new standard. This clinical division scheme defines Published online 10.1148/rg.2017160095 unique prevascular, visceral, and paravertebral compartments