A 10-year old female spayed Siamese cat presents for a new lump the owner found a month ago. She was spayed last year before she was adopted from the shelter. The owner states that the lump has grown over the last month, and it doesn't seem to bother the cat. On exam, the 2 cm lump is located on the left 2nd mammary gland, and no other lumps are noted. The lump is freely moveable, and chest radiographs are clear. What is the chance that this tumor is malignant?
一个10岁的雌性已绝育暹罗猫由于一个主人一个月之前发现的新肿块前来就诊。她去年在被领养离开出收容所之前做了绝育。主人说，这个肿块在过去的这个月一直在长，它看起来不影响这只猫。检查时，左侧第2乳腺有一个2cm大小的肿块，没有发现其他肿块。肿块可自由移动，胸片清晰。这个肿瘤恶性的可能性有多大？
Find out the answer by clicking on one of the listed choices. Good luck!
点击列出的选项找出答案，祝大家好运