A 35-year-old man with AML and WBC of 100,000 cells/ ul is treated with chemotherapy and develops oliguric renal failure. His urine is acidic and numerous crystals are noted in the urine. The most likely diagnosis
**Core Concept**
The question tests the understanding of tumor lysis syndrome, a complication of cancer treatment, particularly in hematological malignancies like Acute Myeloid Leukemia (AML). It involves the rapid release of intracellular contents into the bloodstream due to cell lysis. **Uric acid nephropathy** is a key component of this syndrome.
**Why the Correct Answer is Right**
The correct answer is related to the development of **uric acid nephropathy** as a result of tumor lysis syndrome. During chemotherapy, the rapid lysis of malignant cells leads to the release of large amounts of **nucleic acids**, which are then catabolized to **uric acid**. This excess uric acid can precipitate in the renal tubules, especially in an **acidic urine** environment, leading to oliguric renal failure.
**Why Each Wrong Option is Incorrect**
**Option A:** Would be incorrect as it doesn't directly relate to the specific scenario of tumor lysis syndrome and uric acid nephropathy.
**Option B:** Is incorrect because, although sepsis can cause renal failure, the specific details of acidic urine and numerous crystals point towards a different diagnosis.
**Option C:** Is incorrect as it does not account for the unique combination of oliguric renal failure, acidic urine, and the presence of crystals in the context of AML treatment.
**Clinical Pearl / High-Yield Fact**
Tumor lysis syndrome is a medical emergency that requires prompt recognition and treatment. The presence of **uric acid crystals** in the urine, along with **hyperuricemia**, **hyperphosphatemia**, **hypocalcemia**, and renal failure, is highly suggestive of this condition. Early intervention with **rasburicase** (an enzyme that breaks down uric acid) and aggressive hydration can prevent long-term renal damage.
**Correct Answer:** D. Uric Acid Nephropathy