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Multiple Myeloma Case Study

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Double whammy - IgM Lambda Multiple Myeloma and Normotensive ATN abetting AKI

Multiple Myeloma (MM) is a plasma cell disorder characterized by the neoplastic proliferation of plasma cells in the bone marrow producing monoclonal immunoglobulins. We present a case of light chain lambda predominant MM resulting in acute kidney injury necessitating long term hemodialysis.

A 50 year old male with arterial hypertension and well controlled diabetes presented with complaints of nausea, vomiting and fatigue. Vitals signs were stable, and clinical exam was unremarkable. Labs revealed normocytic anemia with hemoglobin 8 g/dl, elevated BUN (78 mg/dl) and creatinine (6.8 mg/dl, baseline 0.9 mg/dl). Serum electrolytes, calcium, magnesium and phosphorus levels were within normal limits. UA revealed …show more content…

Serum total protein (5.1 mg/dl), albumin (1.1 mg/dl), PTH and 1, 25-dihydroxy-Vitamin D3 levels were low. ESR (87 mm/hr.) and serum viscosity levels were markedly high. A 24-hour urine collection revealed proteinuria (625 mg). A peripheral blood smear revealed rouleaux formation. CT scans of the chest, abdomen and pelvis revealed no obvious malignancy, and there were no osteolytic lesions noted on a skeletal survey. Quantitative immunoglobulins were significant for elevated IgM levels, with concurrent suppression of IgG and IgA levels. Quantitative serum light chain measurement revealed elevated levels of lambda (6925 mg/L) and kappa (mg/L), with a Kappa:Lambda ratio of less than 0.01. SPEP, UPEP and serum immunofixation revealed IgM-Lambda Myeloma (MM). Renal biopsy was performed, tubulointerstitium revealed moderate interstitial fibrosis and tubular atrophy, diffuse acute tubular injury; numerous large intraluminal casts that stained strongly against lambda (3+); diffuse GBM thickening with widespread epithelial foot process effacement. Bone-marrow biopsy with flow cytometry

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