PMC7750755_01
Prominent staghorn blood vessels.
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A prominent hemangiopericytoma-like vascular pattern was observed (Figure 1).
Tumor cells positive for (a) TTF1, (b) synaptophysin, and (c) chromogranin and (d) Ki67
proliferative index was approximately 80%.
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S100 and BCL2. The Ki67 proliferative index was approximately 80% (Figure 2). Small cell carcinoma was the preferred diagnosis.