乳腺叶状囊肉瘤发病率较低，国内报道约占乳腺肿瘤的0．1％～3％，国外报道约占0．3％～0．9％。以女性多见，好发于中青年。其发病年龄较乳腺癌年轻，平均42岁左右。一般病期较长，生长缓慢，病程可达数年至10余年，大多有在短期内突然生长迅速的病史，诊断较为困难。尤为早期 The incidence of phyllodes cystosarcoma of the breast is relatively low. It is reported in China that accounts for about 0.1% to 3% of breast tumors, and foreign reports account for about 0.3% to 0.9%. More common in women, occur in young people. Its onset age is younger than breast cancer, with an average of about 42 years old. The general disease period is long, the growth is slow, the disease course can reach several years to more than 10 years, and most of them have a sudden and rapid growth history in a short period of time. The diagnosis is more difficult. Especially early