Posterior perforation of peptic ulcer drain into
**Core Concept**
Posterior perforation of a peptic ulcer refers to the leakage of gastric or duodenal contents through a perforation in the posterior wall of the stomach or duodenum. This can lead to peritonitis, a life-threatening condition that requires prompt surgical intervention.
**Why the Correct Answer is Right**
When a peptic ulcer perforates posteriorly, the contents of the stomach or duodenum leak into the retroperitoneal space. The retroperitoneal space is a compartment of loose connective tissue that surrounds the kidneys, pancreas, and duodenum. The leakage of gastric or duodenal contents into this space can cause inflammation and infection, leading to peritonitis. The posterior wall of the duodenum is particularly prone to perforation due to its thin wall and proximity to the pancreas and bile ducts.
**Why Each Wrong Option is Incorrect**
**Option A:** The pericardial space is a separate compartment that surrounds the heart, and posterior perforation of a peptic ulcer would not drain into this space.
**Option B:** The mediastinum is the central part of the thoracic cavity that contains the heart, trachea, and esophagus, and is not directly related to the drainage of posterior perforation of a peptic ulcer.
**Option C:** The subphrenic space is a compartment that lies beneath the diaphragm, but it is not the primary site of drainage for posterior perforation of a peptic ulcer.
**Clinical Pearl / High-Yield Fact**
In cases of posterior perforation of a peptic ulcer, the patient may present with signs of retroperitoneal inflammation, such as rebound tenderness in the flanks and a palpable mass in the abdomen. Prompt recognition and surgical intervention are crucial to prevent peritonitis and other complications.
**Correct Answer:** C.