CCND1 and plasma cell neoplasm: Histological evaluation of the mass revealed cells displaying uniformly strong expression of CD138, complete negativity for CD20, and uniform strong nuclear expression of cyclin D1, with expression of monotypic lambda immunoglobulin light chain confirming their neoplastic nature (Figures 4(a) and 4(b)).These features excluded recurrent large B-cell lymphoma and were in keeping with terminal plasmacytic differentiation, suggesting the diagnosis of a plasma cell neoplasm.