**Core Concept**
An undisplaced fracture of the zygoma, also known as a "greenstick" fracture, is a type of facial trauma where the zygomatic bone is partially or completely broken, but remains in its original position. This injury typically occurs due to a direct blow to the orbit or malar area, and requires careful assessment and management to prevent complications and ensure proper healing.

**Why the Correct Answer is Right**
The management of an undisplaced fracture of the zygoma involves conservative treatment, focusing on pain management, facial support, and monitoring for potential complications. The primary goal is to prevent further displacement or comminution of the fracture, which can lead to issues such as malunion, enophthalmos, or facial asymmetry. In many cases, the patient is managed with a period of observation, pain control, and supportive measures, such as a soft diet and ice packs to reduce swelling.

**Why Each Wrong Option is Incorrect**
* **Option A:** Surgical intervention is not typically required for undisplaced fractures of the zygoma, making this option incorrect. While surgery may be necessary in more complex cases, conservative management is usually sufficient for initial treatment.
* **Option B:** While facial fractures often require imaging studies, such as CT scans, to assess the extent of the injury, this option does not address the management of the fracture itself. Imaging is a diagnostic tool, not a treatment option.
* **Option C:** This option is incorrect because the management of an undisplaced fracture of the zygoma does not typically involve the use of external fixation or other surgical hardware. These measures are more commonly used in cases of displaced or comminuted fractures.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that the management of facial fractures, including undisplaced zygomatic fractures, requires a multidisciplinary approach involving facial plastic surgery, orthopedic surgery, and maxillofacial surgery specialists. A thorough understanding of the underlying anatomy and potential complications is crucial for optimal patient outcomes.

**Correct Answer:** A. Conservative management, including pain control and facial support, is the primary approach for managing an undisplaced fracture of the zygoma.