A patient presents with complains of sciatica. On radioligical examination there was sclerotic lesions on his skull. Which of the following is most likely to be elevated in this patient –
**Core Concept**
The patient's symptoms of sciatica combined with sclerotic lesions on the skull suggest a possible diagnosis of multiple myeloma, a type of hematological malignancy characterized by the proliferation of malignant plasma cells in the bone marrow. This condition can lead to bone destruction, but in some cases, it can also cause sclerotic lesions due to the formation of new bone.
**Why the Correct Answer is Right**
The correct answer is related to the pathophysiology of multiple myeloma. In this condition, the malignant plasma cells produce large amounts of a monoclonal immunoglobulin, which can lead to an increase in the levels of a particular protein in the blood. This protein is a key marker for the diagnosis and monitoring of multiple myeloma. The elevated level of this protein can be detected using a specific laboratory test.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is not relevant to the diagnosis of multiple myeloma or the symptoms presented by the patient.
* **Option B:** While this option may be related to bone metabolism, it is not directly related to the diagnosis of multiple myeloma.
* **Option C:** This option is not a specific marker for multiple myeloma and is not related to the symptoms presented by the patient.
**Clinical Pearl / High-Yield Fact**
Multiple myeloma can present with a wide range of symptoms, including bone pain, anemia, and infections. The diagnosis is often made using laboratory tests, including serum protein electrophoresis (SPEP) and 24-hour urine protein electrophoresis (UPEP), which can detect the presence of monoclonal immunoglobulins in the blood and urine.
**Correct Answer:** C.