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![The WHO 2021 thymoma classification: a work in progress](https://image.oaes.cc/ff80e65d-a3b6-4b2a-b5b8-57ecb8907b8a/4616.fig.2.jpg)
Figure 2. Variability of growth patterns in type A thymoma: (A) fascicular growth pattern characterized by elongated fascicle of bland spindle cells, occasional storiform pattern, and sometimes whorling of tumor cells is a common feature of these tumors (20×); (B) Hemangiopericytic growth pattern characterized by numerous branching vessels with open lumina is another appearance Type A thymoma can adopt (20×).