PMC3890467_01
Computed tomography reveals an anterior mediastinal mass with calcifications (arrow).
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F1
A chest computed tomography (CT) scan revealed a mass with calcification in the anterior mediastinum, which was suggestive of thymoma (Fig. 1).
The resected mass is hard and has a lobulated contour. The cut surface is yellow to gray colored with calcification.
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F2
The cut section was hard, yellow to gray, and calcified (Fig. 2).
Histopathology of the mass, HE stained. (A) The mass consists of amorphous eosinophilic hyaline substances that surround islands of thymic tissues, x40. (B, C) Calcification and ossification are present in the amyloid deposits, x40.
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F3
Microscopically, the mass was composed of amorphous eosinophilic hyaline materials surrounding islands of thymic tissues (Fig. 3).
Apple-green birefringence is noted under polarized light microscopy after Congo red staining.
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F4
These eosinophilic substances displayed apple-green birefringence under polarized light microscopy after Congo red staining (Fig. 4).