Smouldering Myeloma: Chasing a Hyperviscous Sample.

Serum hyperviscosity is a rare laboratory finding. Amongst several causes of serum hyperviscosity, malignant disorders are quite common. Monoclonal gammopathy is a family of disorders in which monoclonal gammopathy of unknown significance (MGUS) and smoldering myeloma are the asymptomatic variants whereas multiple myeloma is the malignant variant showing different signs and symptoms related to bone lesions, renal failure and anemia.