Horner’s syndrome consists of which of the following clinical findings?
**Core Concept**
Horner's syndrome is a neurologic disorder that results from disruption of the sympathetic nerves supplying the eye, leading to a constellation of clinical findings. It is characterized by a combination of ptosis, miosis, and anhidrosis, among other symptoms.
**Why the Correct Answer is Right**
The clinical findings of Horner's syndrome are due to the loss of sympathetic nerve supply to the eye. The sympathetic nerves release norepinephrine, which causes dilation of the pupil and contraction of the eyelid. In Horner's syndrome, the loss of sympathetic tone leads to ptosis (drooping eyelid) and miosis (constricted pupil). The anhidrosis (absence of sweating) is due to the interruption of sympathetic fibers that innervate the sweat glands.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is not a characteristic finding of Horner's syndrome. The correct findings include ptosis, miosis, and anhidrosis.
* **Option B:** This option is incorrect because it describes a different syndrome. The combination of ptosis, miosis, and anhidrosis is unique to Horner's syndrome.
* **Option D:** This option is incorrect because it describes a different set of symptoms. The correct findings of Horner's syndrome include ptosis, miosis, and anhidrosis.
**Clinical Pearl / High-Yield Fact**
Horner's syndrome can be caused by a variety of conditions, including trauma, tumors, and vascular diseases. It is essential to diagnose the underlying cause of Horner's syndrome to provide appropriate treatment.
**Correct Answer: C. Ptosis, miosis, and anhidrosis.**