Fig. 1

(A) relatively uniform oval or spindle-shaped myoid cells arranged in a whirlpool pattern (box) (bar = 100 μm). (B) In the clefts, a few red blood cells (short arrow) were observed within the blood vessels, and some tumor cells exhibited vacuolar changes with nuclei located centrally within the cells (long arrow), which is typical feature of myopericytoma. (bar = 100 μm). (C) The myoid cells exhibited acidophilic cytoplasm, uniform nuclear chromatin, and lacked notable nuclear pleomorphism (bar = 100 μm). (D) Nerve fiber (arrow) could be observed in cross-sections located within the center of the tumor (bar = 100 μm). (E) The presence of plump myoid cells encircling rounded, thin-walled vessels (bar = 50 μm). (F) The fibrous capsule had a clear boundary (arrows) with the surrounding normal tissue (bar = 100 μm)