Muchtar E, Dispenzieri A, Lacy MQ et al.
a Division of Hematology , Mayo Clinic , Rochester , MN , USA.
Annals of medicine. Mar 2017.
The diagnosis of amyloidosis requires histological confirmation of Congo-red (CR) deposits. The tissue source is preferably fat aspiration and/or bone marrow biopsy, but at times organ biopsy is required.We studied 612 patients with systemic immunoglobulin light chain amyloidosis to characterize the tissues used to establish the diagnosis.The median number of tissue samples was 3. 95% of bone marrow (BM) biopsies were stained for CR, while 79% of patients had fat aspiration CR-stained. CR stain sensitivity was 69% in BM, 75% in fat aspiration and 89% for both sources combined. In comparison, CR sensitivity was 97-100% for heart, renal and liver biopsies. 42% of patients with renal involvement, 21% of patients with liver involvement and 13% of patients with heart involvement underwent organ biopsy, when a less invasive biopsy would have established the diagnosis. Predictors for the requirement for organ biopsy were male sex, limited organ involvement and lack of fat aspiration.Fat aspiration is underutilized for histologic confirmation of amyloidosis. A high rate of organ biopsies represents a failure to recognize the disease. Early awareness of amyloidosis in patients with organ dysfunction may lead to more judicious use of organ biopsies in this disease.