diagnostic mammo - recall

Had my yearly screening mammo on 9/29, was called back for addl views and ultrasound on 10/19 - radiologist suggested ultrasound guided biopsy for "HYPOECHOIC NODULE IN THE UPPER OUTER QUADRANT OF THE RIGHT BREAST" --- scheduled for this morning, went outpatient, same tech did ultrasound before procedure and could not locate today - radiologist also tried - now they say was a change from previous mammograms, showed me where duct was (a darker line on screen) and a dark mass at the end of it - said it could have been a cyst that disappeared since the 19th, also said breast tissue is dense and a lot of tiny cysts  -  said to reschedule diagnostic mammogram again in 6 months ---- has anyone ever had this....I know I should be happy and grateful but in the back of my mind I am worried....please help

[japdip]

It is not a rare occurance that an area of suspicion will not be evident when additional views are taken following a screening mammogram. Often the area can be a simple as some tissue that has folded over on itself and disappears when compression views are done. Regards .....