What disease does M in liver contrast-enhanced ultrasound puncture needle represent?

M is the symbol for whether the cancer has metastasized far away. Because it is B-ultrasound examination, the transfer situation cannot be determined, so the prompt ---- please consider M? Keep it a secret for those who don't know. M. There is no distant metastasis, M _ indicates uncertain and M1 indicates distant metastasis. According to the condition is more serious. Prepare pain medication, relieve pain, cooperate with treatment.