Breast nodule or a cyst? i just had a breast ultrasound and was first told they saw a nodule, but then later said is probably a cyst and that it may have even exploded. what does this all mean? what is the difference between a nodule and a cyst?

A : A cyst is a contained fluid collection; it usually has a thin outer capsule or rim. A nodule is entirely composed of soft tissue. A cyst can be drained; a nodule cannot be drained because it consists of solid tissue. On mammography, cysts and nodules can have the exact same appearance. However, ultrasound is excellent at differentiating between fluid and solid, and cysts appear very different from nodules on ultrasound. Cysts within the breasts are always benign. If a cyst ruptures, the fluid within the cyst is released and leaks in this surrounding tissue; it is usually then reabsorbed by the body.

Cyst vs solid mass: A breast ultrasound is used to distinguish whether a breast lump is fluid-filled or solid. If its fluid-filled its a breast cyst. A solid-appearing mass could be a noncancerous lump, such as a fibroadenoma, or cancer. Based on what the doctor sees on the ultrasound, he may recommend biopsy. Discuss the findings further with your physician.

Shadows/echos: A nodule looks solid on ultrasound (us) and a cyst is fluid filled. Depending on the machine quality and technician performing the exam, they can be difficult to distinguish. In these cases the radiologist will often come in the room to take a look or perform the exam. A 3-6 month repeat us is usually advised or you can ask for a biopsy. If you are worried, find a breast surgeon to evaluate you.