[Follicular lymphoma with plasmacytic differentiation accompanied by monoclonal IgG gammopathy].

A 59-year-old woman presented with high serum total protein, detected on a screening examination. Laboratory tests revealed high plasma levels of M-protein (IgG-λ), and FDG-PET/CT revealed systemic lymph node swelling and a large tumorous mass in the abdominal cavity. Bone marrow aspirates contained 8.