1. Increasing Dyspnea Due to an Anterior Mediastinal Mass
Dr Jeffrey B. Alpert, MD, Dr Daisuke Nonaka, MD, Dr Abraham Chachoua, MD, Dr Harvey I. Pass, MD, Dr Jane P. Ko, MD 
CHEST 
Volume 139, Issue 1, Pages (January 2011)
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2. Figure 1
Topographic scout image from CT scan angiogram of the coronary arteries reveals a partially calcified anterior mediastinal mass (arrow).
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3. Figure 2
Contrast-enhanced CT images viewed in mediastinal window settings demonstrate a partially calcified soft tissue mass contiguous with the left posterior margin of the sternum. A, Axial. B, Sagittal.
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Copyright © 2011 The American College of Chest Physicians Terms and Conditions

4. Figure 3
Reformatted thin-section axial CT image in bone window shows the sternal mass, which produces cortical irregularity (arrows). The medullary bone appears uninvolved.
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Copyright © 2011 The American College of Chest Physicians Terms and Conditions

5. Figure 4
A, Gross specimen photograph confirms the presence of cartilage and calcification within the tumor (arrows). The mass is attached to involuted fatty thymic tissue. B, Photomicrograph shows lobules of atypical chondromyxoid tissue with focal ossification (hematoxylin and eosin stain [H&E], original magnification ×100). C, Additional magnification image demonstrates tumor invasion of adjacent thymic tissue (H&E stain, original magnification × 40). D, Photomicrograph shows tumor involvement of the sternal cortex (arrow) with sparing of the medullary bone (left) (H&E stain, original magnification × 40).
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