In Chevallet fracture of nasal septum the mechanism of trauma is:
**Core Concept**
A Chevallet fracture of the nasal septum is a type of fracture that occurs due to a specific mechanism of trauma. It involves a sudden, forceful displacement of the nasal septum, resulting in a fracture of the septal cartilage.
**Why the Correct Answer is Right**
The Chevallet fracture typically occurs when there is a sudden increase in pressure within the nasal cavity, often due to a direct blow to the nose. This increase in pressure causes the nasal septum to be displaced anteriorly, resulting in a fracture of the septal cartilage. The septal cartilage is a thin, flexible structure that separates the two nasal passages and is prone to fracture due to its relatively weak composition.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is not relevant to the mechanism of a Chevallet fracture.
**Option B:** A lateral blow to the nose would not typically cause a Chevallet fracture.
**Option C:** A direct blow to the bridge of the nose can cause a different type of fracture, but not a Chevallet fracture.
**Clinical Pearl / High-Yield Fact**
It's essential to remember that Chevallet fractures are often associated with a sudden increase in nasal pressure, which can be caused by a variety of mechanisms, including direct blows to the nose or facial trauma.
**Correct Answer:** D.