**Core Concept**
Craniovertebral junction anomalies (CVJAs) are congenital or acquired abnormalities affecting the region where the skull meets the spine. These anomalies can lead to various neurological and musculoskeletal symptoms due to compression or distortion of the spinal cord and surrounding structures.

**Why the Correct Answer is Right**
Pupillary asymmetry is not a typical presentation of craniovertebral junction anomalies. CVJAs may cause a range of symptoms, including pyramidal signs (such as weakness, spasticity, or reflex changes) due to upper motor neuron lesions, a short neck or low hairline due to bony abnormalities, and even respiratory distress or dysphagia. However, pupillary asymmetry is more commonly associated with midbrain or brainstem lesions, which can occur in isolation or as part of a larger syndrome.

**Why Each Wrong Option is Incorrect**
**Option A:** Pyramidal signs are a common presentation of CVJAs due to compression or distortion of the spinal cord.
**Option B:** A low hairline or short neck can be a characteristic feature of CVJAs, such as in Klippel-Feil syndrome.
**Option C:** A short neck is a classic sign of CVJAs, which can result from bony fusion or other developmental abnormalities.

**Clinical Pearl / High-Yield Fact**
In patients with suspected CVJAs, it's essential to evaluate the entire neck and spine, as well as the neurological examination, to identify any signs of compression or distortion of the spinal cord.

**✓ Correct Answer: D. Pupillary asymmetry**