Difficult to say what the lumps are without examination of the imaging studies.
I would assume an ultrasound was performed that showed the lumps. Further testing with a CT scan or MRI can be considered.
If there still is a question about the diagnosis, a biopsy can be considered for a more definitive diagnosis.
A referral to a GI specialist or a hepatologist (liver specialist) can be considered.
These options can be discussed with your personal physician.
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