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![The WHO 2021 thymoma classification: a work in progress](https://image.oaes.cc/ff80e65d-a3b6-4b2a-b5b8-57ecb8907b8a/4616.fig.1.jpg)
Figure 1. Two basic types of cells in thymoma: (A) spindle or oval cells devoid of nucleoli and with dispersed chromatin pattern and scant cytoplasm characterize type A thymoma (60×); (B) large round to polygonal cells with vesicular nuclei, scant nuclear chromatin and prominent eosinophilic nucleoli surrounded by an ample but indistinct rim of cytoplasm characterize type B thymomas (60×).