New breast cyst found

My mom was diagnosed with DCIS postmenopausal at 53 (12 years ago).  Hormone receptor postive, negative nodes.  Was on Tamoxifen for 5 years.  Had mastectomy with implant.  Not on any HRT.  Went for checkup with a breast dr in early 08 found cyst in breast with mastectomy.  Did sono in office found to be a simple cyst.  Now 5 months later and the cyst( still very small) is still palpable, but has not changed size, etc.  What is the follow up now.  She will have another sonogram to check cyst.  Should she have this aspirated even if simple cyst on sonogram?  What followup is needed.  My mom is afraid of implant being punctured.  Is it okay for postmenopausal women not on HRT to have simple cysts?  Not sure what to do.

[Cleveland Clinic]

Dear debtip:  There is no real reason to aspirate a simple cyst as long as there is certainty that this is what it is.  The reason to aspirate a cyst is if it causes pain or if it is causing worry.  Your mother should discuss her options for follow up with her doctor.  

[debtip]

A related discussion, not cyst but a lymph node was started.