Which of the following is not a major criteria for diagnosis of multiple myeloma?
**Core Concept**
Multiple myeloma is a type of blood cancer characterized by the proliferation of malignant plasma cells in the bone marrow. The diagnosis of multiple myeloma is based on a combination of clinical, radiological, and laboratory findings. The International Myeloma Working Group (IMWG) has established specific criteria for the diagnosis of multiple myeloma.
**Why the Correct Answer is Right**
The IMWG criteria for the diagnosis of multiple myeloma include:
* Clonal plasma cells in the bone marrow of 10% or more
* One or more of the following: lytic bone lesions, hypercalcemia, anemia, and/or renal insufficiency
* Monoclonal protein in the serum or urine (M-protein)
* Bone marrow plasma cell percentage of 60% or more
**Why Each Wrong Option is Incorrect**
* **Option A:** This is not a major criterion for the diagnosis of multiple myeloma. However, it can be a supportive finding.
* **Option B:** This is a major criterion for the diagnosis of multiple myeloma. Monoclonal protein in the serum or urine (M-protein) is a key feature of the disease.
* **Option C:** This is a major criterion for the diagnosis of multiple myeloma. Lytic bone lesions are a common feature of the disease.
* **Option D:** This is a minor criterion for the diagnosis of multiple myeloma. It can be used to support the diagnosis, but it is not a major criterion.
**Clinical Pearl / High-Yield Fact**
It's essential to remember that the diagnosis of multiple myeloma should be made based on a combination of clinical, radiological, and laboratory findings. A single abnormality is not sufficient for diagnosis, and a thorough evaluation is necessary to confirm the presence of the disease.
**Correct Answer:** D.