The mention of hard fibroids is unfamiliar to everyone. In particular, many people are easily confused about the relationship between fibroma, hard fibroma and fibrosarcoma, and even think that they are one disease, just different names. In fact, these three diseases are worlds apart despite the difference in words. Although fibroma, sclerofibroma, and fibrosarcoma are all diseases caused by excessive tissue cell proliferation, they are completely different in malignancy. Fibrosarcoma is the most malignant of the three diseases, and what is medically called “sarcoma” is actually a malignant tumor, just like cancer. Fibrosarcoma and fibrosarcoma, on the other hand, are both benign tumors, but fibrosarcoma is more malignant than fibrosarcoma. Because fibroids are simply benign tumors, there is basically nothing to worry about after surgical removal, while patients with hard fibroids need to continue to be concerned about recurrence after surgery. It is important to note that some people used to think that hard fibroids are a kind of low-grade malignant tumor, but this statement is actually wrong. This is because hard fibroids do not metastasize. Therefore, hard fibroids are benign tumors or can be understood as a tumor between benign and malignant, i.e., junctional tumors. So, can hard fibroids become malignant to fibrosarcoma? Undeniably, this possibility does exist. However, the chance of malignancy in hard fibroids is very low, less than 1%. In general, repeated surgical irritation of the tumor or having had radiation therapy, etc. may allow the hard fibroid to become malignant and lead to the development of fibrosarcoma. Overall, there is a clear “good and bad” line between fibrosarcoma, fibroma and hard fibroma. It is just that fibroblastoma is far from this dividing line, while hard fibroblastoma is closer to this dividing line, and if hard fibroblastoma is repeatedly stimulated, it may cross over into the fibrosarcoma camp.