**Question:** Which of the following is the LEAST likely to be associated with gross hematuria?

A. Acute kidney injury (AKI)
B. Chronic kidney disease (CKD)
C. Polycythemia vera (PCV)
D. Prostate cancer

**Correct Answer:** C. Polycythemia vera (PCV)

**Core Concept:** Gross hematuria refers to the presence of a large number of red blood cells in the urine, which is typically an indicator of some form of renal or urinary tract disease. Polycythemia vera (PCV) is a rare blood disorder characterized by an excessive production of red blood cells.

**Why the Correct Answer is Right:** Gross hematuria is not directly associated with PCV, as the condition primarily affects the hematopoietic system rather than the renal or urinary tract. Although PCV can lead to hypertension and kidney damage, it is not the primary cause of gross hematuria.

**Why Each Wrong Option is Incorrect:**

A. Acute kidney injury (AKI) and chronic kidney disease (CKD) are conditions that can cause renal dysfunction, leading to conditions like gross hematuria. These options are more likely to be associated with hematuria compared to PCV.

B. Prostate cancer is a malignancy that can cause hematuria, particularly in males, due to compression or infiltration of the urethra or bladder. However, it is still less likely than PCV to cause gross hematuria.

**Clinical Pearl:** Gross hematuria can be a nonspecific symptom in various renal and urinary tract disorders. While PCV is a potential cause, the correct answer is chosen due to its rarity compared to the other options. PCV typically presents with anemia, hypertension, and other hematological findings, while gross hematuria is more commonly seen in conditions affecting the urinary system directly.