PMC3843928_01
MRI of the chest before chemotherapy (a), after 2 cycles of chemotherapy (b), and after 4 cycles of chemotherapy (c). An anterior mediastinal mass and pericardial effusion can be seen (arrows; a); the size of the mass and volume of the pericardial effusion were reduced after the chemotherapy (arrows; b, c).
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F1
Magnetic resonance imaging (MRI) of the chest revealed a large anterior mediastinal mass, pleural dissemination, and pericardial effusion (fig. 1a). After 2 cycles of this regimen, MRI of the chest revealed a 32% decrease in the diameter of the anterior mediastinal tumor and a reduction of the pericardial effusion, indicating a partial response based on the RECIST criteria (fig. 1b). The partial response was confirmed after 4 cycles of this regimen (fig. 1c).
a Section of the tumor composed of epithelioid cells with high cellularity. The tumor cells were positive for CD5 (b) and CD117 (c). HE. Original magnification, x200.
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F2
Histologically, the tumor was composed of epithelioid cells with high cellularity, which had nuclear atypia and eosinophilic cytoplasm in fibrotic stroma (fig. 2a). In addition, CD5 (fig. 2b) and CD117 (fig. 2c) were also detected in tumor cells.