On gross appearance the tumors were well circumscribed,surrounded by a pseudocapsule,and with the cut surface usually showing a grey to yellow tinge and scattered reddish-brown areas.

 
  • 光镜下肿瘤主要有4种改变:实性圆性细胞片区、乳头样突起、血管瘤样改变或出血灶及硬化。
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