Not a feature of multiple myeloma –
**Core Concept**
Multiple myeloma is a clonal plasma cell disorder characterized by the proliferation of malignant plasma cells in the bone marrow, leading to bone destruction, anemia, renal failure, and hypercalcemia. The disease is primarily driven by genetic mutations that disrupt normal plasma cell function and regulation.
**Why the Correct Answer is Right**
Multiple myeloma is a malignancy of plasma cells, and the key pathophysiological features include bone destruction, anemia, hypercalcemia, and renal impairment. The disease is associated with the production of monoclonal immunoglobulins, which can lead to hyperviscosity syndrome, amyloidosis, and other complications.
**Why Each Wrong Option is Incorrect**
**Option A:** Bone pain is a common feature of multiple myeloma, resulting from bone destruction and the release of osteoclast-activating factors by malignant plasma cells.
**Option B:** Hypercalcemia is a hallmark of multiple myeloma, caused by the production of osteoclast-activating factors, bone destruction, and increased bone resorption.
**Option C:** Anemia is a common feature of multiple myeloma, resulting from the replacement of normal bone marrow elements by malignant plasma cells and the production of erythropoietin inhibitors.
**Clinical Pearl / High-Yield Fact**
The production of monoclonal immunoglobulins in multiple myeloma can lead to a variety of complications, including hyperviscosity syndrome, amyloidosis, and nephrotic syndrome.
**Correct Answer:** D.