Ewing Sarcoma of the Lung: Imaging of a Rare Tumor

Figures

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  Figure 1. Chest X-ray Anteroposterior chest X-ray showing opacification of 3/4th of the right hemithorax, with a laterally rising border and loculated air pockets within the opacification, suggestive of pleural effusion and loculated pneumothorax

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  Figure 2. Transthoracic ultrasound A: Grayscale US showing a predominantly hypoechoic mass with amorphous calcifications (asterisks); B: Color Doppler (B-Flow) depicting rich vascularity

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  Figure 3. CT findings 3A-3C: Axial chest CT (A is non-contrast, B is arterial phase, and C is portal venous phase) at the level of the heart. A large heterogenous mass with central amorphous calcifications (A, crosses) and neovascularity (B, asterisks) is occupying the right hemithorax. The arrows show the mass margins. 3D-3F: Axial abdominal CT (same phases as above). The heterogeneous mass is shown with arrows at segment 8 of the liver. It has similar imaging findings to the lung mass.

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  Figure 4. Percutaneous biopsy Percutaneous biopsy of the lung (A) and liver (B) mass. In both pictures, the arrows show the biopsy needle and the asterisks show the margins of the masses.

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  Figure 5. Histology A: Histology that shows small round cells with indistinct pale eosinophilic cytoplasm (hematoxylin-eosin stain, magnified x200); B, C: Immunohistochemically, the cells are positive for BCL-2 (B) and CD99+ (C) (magnified X200 and x400, respectively)