Oxalate crystals in urine is seen in: (PGI Dec 2006)
**Core Concept**
Oxalate crystals in urine are associated with **kidney stone formation**, specifically **calcium oxalate stones**. This condition is related to **nephrology** and **urolithiasis**. The presence of oxalate crystals can indicate an increased risk of developing kidney stones.
**Why the Correct Answer is Right**
The correct answer is related to **ethylene glycol poisoning** or **primary hyperoxaluria**, conditions where oxalate levels are elevated. In these cases, the body either ingests or produces excessive amounts of oxalate, leading to its excretion in the urine. This can cause the formation of calcium oxalate crystals, which are a common component of kidney stones.
**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because while certain medications can increase the risk of kidney stones, they are not directly associated with oxalate crystals in urine.
**Option B:** Incorrect as it is not directly related to the presence of oxalate crystals in urine.
**Option C:** Incorrect because, although it might be related to kidney issues, it is not specifically linked to oxalate crystals.
**Clinical Pearl / High-Yield Fact**
A key point to remember is that **primary hyperoxaluria** is a rare genetic disorder that leads to an overproduction of oxalate, resulting in its accumulation in the body and increased excretion in the urine. This condition significantly increases the risk of developing kidney stones.
**Correct Answer:** D. Ethylene glycol poisoning