Frey syndrome includes
**Core Concept**
Frey syndrome, also known as gustatory sweating or auriculotemporal syndrome, is a rare neurological disorder characterized by excessive sweating (hyperhidrosis) and flushing in response to stimuli that normally provoke salivation, such as the smell or taste of food. This condition typically occurs after damage to the parotid gland or its surrounding nerves.
**Why the Correct Answer is Right**
Frey syndrome is caused by aberrant regeneration of nerve fibers between the remaining parotid gland tissue and the overlying skin, resulting in inappropriate cross-talk between the sympathetic and parasympathetic nervous systems. This leads to the release of acetylcholine, a neurotransmitter that stimulates salivation, which in turn causes the sweat glands to secrete excessive amounts of sweat. The auriculotemporal nerve, which carries sympathetic and parasympathetic fibers, is often implicated in the pathogenesis of Frey syndrome.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is not a characteristic of Frey syndrome. While hyperhidrosis is a key feature, it is not the only symptom.
**Option B:** This option is incorrect because Frey syndrome is not primarily associated with parotid gland tumors. Although the parotid gland is involved, the underlying cause is nerve damage and aberrant regeneration.
**Option C:** This option is not a correct description of Frey syndrome. While gustatory sweating is a hallmark symptom, the condition is not exclusive to the auriculotemporal nerve.
**Clinical Pearl / High-Yield Fact**
Frey syndrome is often seen after parotid surgery, particularly in cases where the auriculotemporal nerve is damaged. It is essential to recognize this condition early and manage it appropriately to prevent further complications.
**Correct Answer:** D.