What is the percentage of phyllodes tumors classified as malignant?

Phyllodes tumors, also known as cystosarcoma phyllodes, are a rare type of breast tumor that can vary in behavior from benign to malignant. The correct percentage of phyllodes tumors that are classified as malignant is approximately 10% to 30%. However, the most accepted figure in the literature for malignant phyllodes tumors is around 10%.

Typically, these tumors are assessed based on their histopathological features and can exhibit a range of differentiation. The malignant phyllodes tumors have the potential to metastasize, leading to a worse prognosis compared to benign varieties. Therefore, understanding their classification is vital for appropriate management and treatment.

While many tumors in other contexts may show a lower malignancy rate, the range for phyllodes tumors specifically reflects their unique biological behavior. The incorrect options reflect either a misunderstanding of the overall pathologic classification or misestimation of the tumor's malignant potential in clinical practice.