Okay, let's tackle this question about the fracture of the lateral condyle of the humerus. The user wants a detailed explanation for a medical MCQ, so I need to make sure I cover all the sections they specified.

First, the core concept. The question is about exceptions in the characteristics of this fracture. The lateral condyle is part of the humerus, and this is a common injury in children. The key aspects might include classification, treatment, complications, and differentials.

Next, the correct answer. Since the question is an "except" question, I need to figure out which option is the incorrect statement. Common true statements about this fracture include that it's a Salter-Harris Type III fracture, treated by open reduction, and has a risk of cubitus varus. The exception might be something like it being more common in adults, which it's not—it's a pediatric injury. So the correct answer would be the option stating that it's common in adults.

For the wrong options, each incorrect one should be explained. For example, if an option says it's a Salter-Harris Type II, that's wrong because Type III is correct. Another might incorrectly state that it's treated with closed reduction, but actually, open reduction is needed. Also, if an option mentions cubitus valgus as a complication instead of varus, that's incorrect.

The clinical pearl should highlight that this is a pediatric fracture, often requiring surgical intervention, and the risk of malunion leading to cubitus varus. Mnemonics or high-yield facts here are crucial for exam success.

I need to structure each section clearly, using bold for the section headers and correct medical terminology. Ensure that each part is concise, within the character limit, and that the explanation is thorough but not too lengthy. Also, check that the correct answer is clearly marked and that each incorrect option is addressed properly.

**Core Concept**
Fractures of the lateral condyle of the humerus are common in children, classified as Salter-Harris Type III injuries. Key features include instability due to articular surface disruption, high risk of nonunion, and potential for malunion leading to cubitus varus.

**Why the Correct Answer is Right**
The **exception** is the option stating "common in adults." Lateral condyle fractures are **pediatric-specific** due to the open physis and weaker metaphyseal cortex in children. Adults typically sustain medial epicondyle fractures or intra-articular fractures from high-energy trauma. Treatment requires open reduction and internal fixation to restore joint congruity and prevent complications.

**Why Each Wrong Option is Incorrect**
**Option A:** "Salter-Harris Type III fracture" is correct—this fracture involves the physis and articular surface.
**Option B:** "Treated with open reduction" is correct—closed reduction fails due to poor bony purchase.
**Option C:** "Risk of cubitus varus" is correct—malunion causes medial deviation of the forearm.

**Clinical Pearl / High-Yield Fact**
Never confuse lateral condyle fractures with medial epicondyle fractures. Lateral condyle injuries are **pediatric-only**, while medial epicondyle fractures can occur in adults. Remember: **"Lateral kids, medial all ages"** (medial epicondyle fractures span all ages).

**Correct

✓ Correct Answer: B. Results in Gun stock deformity