**Core Concept**
A LeFort III fracture is a severe facial trauma characterized by a complete separation of the midface (maxilla and nasal bones) from the cranial base, resulting in an elongated face and significant mobility of the midface.

**Why the Correct Answer is Right**
This fracture typically occurs due to high-impact trauma, such as being struck by a baseball bat, causing the face to be subjected to a significant amount of force. The fracture line in a LeFort III fracture runs through the nasofrontal suture, the lacrimal bone, the inferior orbital rim, and the pterygoid plates, completely dissociating the midface from the cranial base. The mobility of the middle third of the face on digital manipulation of the maxilla is a classic clinical finding in LeFort III fractures.

**Why Each Wrong Option is Incorrect**
**Option A:** A lambdoid injury refers to a type of skull fracture that occurs in the posterior cranial fossa, typically due to falls or blows to the back of the head. It is not associated with facial trauma or mobility of the midface.
**Option B:** An odontoid fracture is a type of fracture that occurs at the base of the dens (odontoid process) in the axis (C2) vertebra, often due to high-impact trauma or osteoporosis. It is not related to facial trauma or LeFort fractures.
**Option D:** A palatal split refers to a type of fracture that occurs in the palate, typically due to a fall or direct blow to the mouth. While it is a type of facial fracture, it is not a LeFort III fracture and does not involve the complete separation of the midface from the cranial base.

**Clinical Pearl / High-Yield Fact**
A LeFort III fracture is a surgical emergency that requires immediate intervention to restore facial alignment and prevent long-term complications, such as nasolacrimal duct obstruction and malocclusion.

**✓ Correct Answer: C. LeFort III fracture**