True statements regarding Zenker’s diverticulum include
**Core Concept**
Zenker's diverticulum is a type of pharyngoesophageal diverticulum, which is a herniation of the pharyngeal mucosa through a weakness in the muscular wall of the pharynx, specifically the cricopharyngeus muscle. This condition leads to symptoms such as dysphagia, regurgitation, and aspiration of food.
**Why the Correct Answer is Right**
The cricopharyngeus muscle is the primary muscle involved in the development of Zenker's diverticulum. The muscle's failure to relax properly during swallowing leads to increased pressure in the pharynx, causing the mucosa to herniate through the weakness. This is often accompanied by a narrow orifice, which can result in food becoming trapped in the diverticulum. The diverticulum is typically located in the upper posterior esophagus.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because Zenker's diverticulum is not typically associated with a hiatal hernia. Hiatal hernias involve the stomach herniating through the esophageal hiatus, whereas Zenker's diverticulum involves the pharyngeal mucosa herniating through a weakness in the pharyngeal wall.
**Option B:** This option is incorrect because Zenker's diverticulum is not typically diagnosed with a barium swallow study alone. While a barium swallow can help identify the diverticulum, other imaging modalities such as endoscopy or CT scans may be necessary to fully evaluate the extent of the disease.
**Option C:** This option is incorrect because Zenker's diverticulum is not typically associated with a significant decrease in the pharyngeal peristalsis. In fact, the cricopharyngeus muscle's failure to relax can lead to increased pharyngeal pressure and subsequent hypertrophy of the pharyngeal muscles.
**Clinical Pearl / High-Yield Fact**
A key clinical finding in Zenker's diverticulum is the presence of a palpable mass in the neck, which is often described as a "bulge" or "mass" in the upper posterior aspect of the neck. This finding is due to the diverticulum's location and the resultant hypertrophy of the surrounding pharyngeal muscles.
**Correct Answer:** C.