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Difference between revisions of "Thymoma"
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Image: Thymoma type B1 - alt -- very high mag.jpg | Thymoma B1 - very high mag. | Image: Thymoma type B1 - alt -- very high mag.jpg | Thymoma B1 - very high mag. | ||
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====Case==== | |||
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File:5 404717367 sl 1.png|Thymoma type B1 | |||
File:5 404717367 sl 2.png|Thymoma type B1 | |||
File:5 404717367 sl 3.png|Thymoma type B1 | |||
File:5 404717367 sl 4.png|Thymoma type B1 | |||
File:5 404717367 sl 5.png|Thymoma type B1 | |||
File:5 404717367 sl 6.png|Thymoma type B1 | |||
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Thymoma type B1 in a 33 y man, 384 gram 9 x 10 x 8 cm. A. Blue tumor shows a starry sky pattern (red square), as well as occasional fibrous bands (red arrows). B. Epithelial component, impossible to see on H&E at lower power, is readily identified, here with immunostain for CK7. C. CK7 positivity favors B over type A. Note that where the nuclei are visible the tumor cells are round, proving type B. The predominance of lymphoid cells makes this tumor B1. D. Lymphoid cells are uniform and small. Arrows show the tangible body macrophages that gave the low power starry sky appearance. E. Lymphoid cells are CD5 positive. F. Lymphoid cells are TdT positive. | Thymoma type B1 in a 33 y man, 384 gram 9 x 10 x 8 cm. A. Blue tumor shows a starry sky pattern (red square), as well as occasional fibrous bands (red arrows). B. Epithelial component, impossible to see on H&E at lower power, is readily identified, here with immunostain for CK7. C. CK7 positivity favors B over type A. Note that where the nuclei are visible the tumor cells are round, proving type B. The predominance of lymphoid cells makes this tumor B1. D. Lymphoid cells are uniform and small. Arrows show the tangible body macrophages that gave the low power starry sky appearance. E. Lymphoid cells are CD5 positive. F. Lymphoid cells are TdT positive. | ||