Type A Thymoma : Microcystic Areas
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![Mediastinum_Thymoma_TypeA_SpindleCell22.jpg](/slides-13/slides/Mediastinum_Thymoma_TypeA_SpindleCell22.jpg)
Comments:
Type A thymoma is composed of bland spindle or oval epithelial cells admixed with few or no lymphocytes. It can display a variety of architectural patterns, including cystic foci (shown here), rosettes, glandular structures, meningioma-like whorls, storiform pattern, and hemangiopericytoma-like vascular areas. Multiple pattern are seen within the same tumor.