**Core Concept**
Pseudopancreatic cyst, also known as a pancreatic pseudocyst, is a fluid collection that forms in the abdomen as a result of pancreatitis. The cyst is lined by a fibrous wall and contains pancreatic enzymes, digestive enzymes, and other cellular debris. This condition often arises in the setting of acute or chronic pancreatitis.

**Why the Correct Answer is Right**
The key features of a pseudopancreatic cyst include a fluid collection in the abdomen, a fibrous wall, and the presence of pancreatic enzymes and cellular debris. These features are a direct result of the pancreatic tissue damage caused by pancreatitis. The cyst is often located near the tail of the pancreas and may cause symptoms such as abdominal pain, weight loss, and nausea.

**Why Each Wrong Option is Incorrect**
**Option A:** The presence of a thick, fibrous wall is a characteristic feature of pseudopancreatic cysts, making this option incorrect.
**Option B:** Pseudopancreatic cysts often contain pancreatic enzymes and cellular debris, which can cause symptoms and complications, so this option is also incorrect.
**Option C:** A pseudopancreatic cyst is not a true cyst, but rather a fluid collection with a fibrous wall, so this option is incorrect.

**Clinical Pearl / High-Yield Fact**
A pseudopancreatic cyst is a complication of pancreatitis that can be managed with drainage or surgical intervention. It is essential to distinguish pseudopancreatic cysts from true pancreatic cysts, such as mucinous cystic neoplasms or serous cystadenomas, which may require different treatment approaches.

**Correct Answer: C. Pseudopancreatic cyst is not a true cyst, but rather a fluid collection with a fibrous wall.**