患者,男性,32岁,肛门缘出现疼痛性包块2d。查体:包块紫色、张力大,压痛明显,考虑痔的可能性大,其病变的类型与分期为( )。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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