It is possible that the first MRI missed the cysts or hemangiomas. Although possible, it is less likely that new cysts or hemangiomas would have formed in the span of a month.
You can consider a blood test for an alpha-fetoprotein if liver cancer is a concern.
However, I would discuss the results of these MRIs with your personal physician. It will be likely a repeat imaging study will be needed in the near future to ensure that the lesions are not spreading nor growing.
Followup with your personal physician is essential.
This answer is not intended as and does not substitute for medical advice - the information presented is for patient education only. Please see your personal physician for further evaluation of your individual case.
Kevin, M.D.
http://www.straightfromthedoc.com