Welcome to health care magic.
1.There was a lump in the first
ultrasound in the LUQ the possibilities could be
splenomegaly in the first place.
2.But since the earlier scan has not mentioned any thing about the
spleen, the other possibilities are
lymph nodal enlargement.
3.As its seen bilaterally as you have mentioned - more of lymph nodal pathology.
4.The next possibilities related to the periods suggest adnexal space occupying lesion.
5.Ovarian lesions also seen bilaterally extending up to the upper quadrants.
6.Best investigation of choice in this case will be CT with contrast, as ultrasound will be inconclusive.
Good luck.
Hope i have answered your query,
any thing to ask ? do not hesitate to ask.
http://doctor.healthcaremagic.com/doctors/dr-ganesh/62888