Can a doctor tell if the cyst or a tumor is malignant by performing a ultrasound?

Most of time but: But final diagnosis tumor by biopsy only, no matter where it is located , as some of the complex cysts will contain malignant lesson final answer is by pathologist only.

See answer: A cyst is defined as simple and hence benign if it is sharply demarcated, has no internal echogenicity and has good thru transmission of sound. If the walls are thicker, vascular, nodular, have colorflow or there is internal echogenicity in the “cystic lesion” it isn’t a simple cyst – and either follow-up or additional imaging should be considered to deliniate, based on your drs. Assessment in th.