Thyroid u/s reviled solitary right of midline, 9mm complex cystic nonvascular ismuth nodule.. should i be worried / biopsy?

Possibly : The ultrasound should be followed up with an appointment with an ear, nose and throat surgeon to discuss biopsy vs an additional nuclear medicine test that can give more information about the nodule. There should also be some lab tests done to measure thyroid hormones. All of that information will be used in making the best decision for you.

Probably benign: As a pathologist i examine these biopsies under the microscope for diagnosis most of these kind of complex small cyst in the thyroid are benign colloid cysts . Sometimes they are related to small benign tumors which will never become malignant. If the lesion gets a little bigger or it bothers you you can go to your doctor and have a fine needle aspiration done to examine the cells. This is easy to do and relatively painless and will give you a great deal of information it can be done in just a few minutes good luck.