Simultaneous Clinical Presentation of Renal Cell Carcinoma and Immunoglobulin Light Chain Amyloidosis

A 77-year-old female was admitted to the hospital for an evaluation of congestive heart failure. She gave a history of progressive peripheral edema over eight to 10 months, extending up to the knees bilaterally. Admitting creatinine was 148 mmol/L, serum albumin was 15g/L, and urine protein on quantification was 9.09 g/day. Her immunoglobulin G (IgG) level was 18.4g/L and serum-free kappa level was 92.3 mg/L. The immunofixation of urine revealed monoclonal IgG kappa (1.97 g/d). Her kidney biopsy subsequently confirmed the diagnosis of immunoglobulin light chain (AL) amyloidosis. During the course of investigations, it was incidentally noted that she had a mass on her right kidney, which on biopsy was identified as renal cell carcinoma (RCC). This case deals with the rare situation of AL amyloidosis existing with a solid organ carcinoma and the therapeutic dilemma of treating two unrelated conditions involving the kidneys.