Maintain regular follow-ups with the Breast specialist doc, they will usually monitor if there's growth or if it's odd shape via ultrascans.
From my experience, if all is well, doc will not advise much other than go back for ultrascans regularly. But subsequently I went to remove the cyst with the advice of my doc when she noticed that it's progressively growing.
I'll say just maintain a positive spirit and provide your wife with the support she needs. Take care!
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