Which is true about Multiple Myeloma?
**Multiple Myeloma**
**Core Concept**
Multiple Myeloma is a malignant plasma cell disorder characterized by clonal proliferation of neoplastic plasma cells in the bone marrow, leading to bone destruction, anemia, renal impairment, and immunodeficiency. The pathogenesis involves genetic mutations in the myeloma cells, which disrupt normal plasma cell function and lead to uncontrolled cell growth.
**Why the Correct Answer is Right**
The correct answer is related to the pathophysiology of Multiple Myeloma. The disease is characterized by the production of monoclonal immunoglobulins, also known as M proteins, by the neoplastic plasma cells. These M proteins can cause hyperviscosity syndrome, kidney damage, and other complications. In addition, multiple myeloma is often associated with bone lesions due to the activation of osteoclasts by the myeloma cells, leading to bone resorption.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not accurately describe a characteristic of Multiple Myeloma. While some cancers may be associated with paraneoplastic syndromes, this is not a defining feature of Multiple Myeloma.
**Option B:** This option is incorrect because it is more commonly associated with Waldenström's Macroglobulinemia, a different type of lymphoproliferative disorder.
**Option C:** This option is incorrect because it describes a characteristic of Chronic Lymphocytic Leukemia (CLL), not Multiple Myeloma.
**Clinical Pearl / High-Yield Fact**
It's essential to remember that Multiple Myeloma is often diagnosed incidentally during a routine blood test, as the disease can cause anemia, hypercalcemia, and kidney damage. A high serum M protein level and lytic bone lesions on radiographs are key diagnostic features.
**Correct Answer: D.**