F 66, Anterior mediastinal mass

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F 66, Anterior mediastinal mass
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Type A Thymoma shows encapsulated mass and less
distinct dissecting fibous bands than is seen in
other type.
Cytokeratin (CK)
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Type A Thymoma composed of spindle cells or oval
cells with bland nuclei arranged in sheets.
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Solid sheets without any particular pattern
Cysts of various size
Glandular sturctures
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Type A thymoma has few or no lymphocytes. The
tumor cells are spindle and/or oval shaped with
bland nuclei, dispersed chromatin and
inconspicuous nucleoli.