Dr said breast lump was big and with echo he could tell if it was an adenoma, now says i need another scan because hes not sure?

Combined imaging: Evaluation of breast masses included sound wave tests, mammography (breast x-ray), and physical examination as the first tier. If findings are equivocal, a breast MRI (pictures with large magnets) or biopsy may be indicated.

Get the scan: Even fairly large breast lumps can be benign. They are usually cysts or solid "fibro-adenomas". On ultrasound these lesions are expected to be smooth and even throughout. This occurs in women with "fibrocystic" disease which can also cause areas of denser breast tissue making mammograms harder to interpret. Early (3-6 month) repeat scans can be useful to be sure the original result was correct.

Complete the workup: What led to the original ultrasound? Was it an abnormal exam or mammogram? Please see your doctor and get a complete breast evaluation. Depending on the mammogram results (and make sure the mammography has your ultrasound images!), further workup may be necessary, possibly including mri. If the findings are not completely benign, a biopsy to look at tissue under the microscope is required.

Purpose of U/S: The ultrasound is done to determine if a lump is solid or cystic. I recommend biopsy of a solid lesion. The appearance of a 'adenoma' (actually a fibroadenoma), is similar to a phyllodes tumor, which has a small malignant potential. If radio graphic and clinical features are 'benign' in a young (< 30 yo), repeat ultrasound every 6 mo for 1-2 years would be acceptable. For you, i would biopsy.