Okay, let's tackle this question about urinary bladder stones. The question is asking which statement is not true regarding bladder stones. First, I need to recall the key points about bladder stones. Bladder stones, also known as cystolithiasis, can form due to various reasons like urinary stasis, infection, or obstruction. Common causes include neurogenic bladder, benign prostatic hyperplasia in men, or in children, maybe due to poor diet or congenital issues.

The core concept here is understanding the etiology, presentation, and management of bladder stones. The main idea is that bladder stones are usually secondary to an underlying condition causing urinary retention or infection. They can cause symptoms like dysuria, hematuria, or frequency. Diagnosis is often via imaging like ultrasound or X-ray, and treatment typically involves removing the stone, either through cystolitholapaxy or surgery.

Now, the question is about which statement is not true. Let's think about common misconceptions. For example, some might think that all bladder stones are radiopaque, but actually, some can be radiolucent, especially if they're composed of struvite or other materials. Another point is that in developed countries, bladder stones are less common than kidney stones, but they're more often seen in patients with certain conditions like BPH or neurogenic bladder.

If the options include statements like "Bladder stones are always radiopaque," that would be incorrect because some are radiolucent. Another incorrect statement might be "Bladder stones are more common in females than males," which is false because they're more common in males, especially due to prostate issues. Also, if an option says "Bladder stones can't cause hematuria," that's wrong because they can lead to irritation and bleeding.

So, the clinical pearl here is to remember that bladder stones are often secondary to an underlying condition, and their composition can affect imaging findings. The key is to identify the false statement based on these principles. The correct answer would be the one that contradicts these facts.

**Core Concept**
Bladder stones (cystolithiasis) typically form secondary to urinary stasis, infection, or obstruction. They are more common in males and often associated with conditions like benign prostatic hyperplasia, neurogenic bladder, or chronic urinary retention. Stones may be radiopaque or radiolucent depending on composition.

**Why the Correct Answer is Right**
The false statement would likely claim that bladder stones are "always radiopaque." In reality, while many bladder stones are radiopaque (e.g., calcium oxalate, calcium phosphate), struvite (magnesium ammonium phosphate) stones are often radiolucent. Radiographic appearance depends on stone composition, making this statement incorrect. Other false claims might involve gender prevalence (bladder stones are more common in males) or causation (they are secondary to obstruction, not primary disease).

**Why Each Wrong Option is Incorrect**
**Option A:** *"Bladder stones are commonly associated with neurogenic bladder"* – Correct. Neurogenic bladder causes urinary retention, a major risk factor.
**Option B:** *"Struvite stones are the most common type of bladder stone"* – Incorrect. Struvite stones are more common in upper urinary tract infections; calcium oxalate is more typical in bladder stones.
**Option C:** *"Bladder stones typically cause hematuria and dysuria"* –

✓ Correct Answer: B. Uric acid stones are dropped from above