Cytokeratin 8 and 18 and ubiquitin present in all except?
## Core Concept
The question pertains to the identification of inclusions or pathological features associated with specific cytokeratins and ubiquitin in various diseases. Cytokeratins 8 and 18, along with ubiquitin, are components of Mallory-Denk bodies, which are characteristic of certain liver conditions.
## Why the Correct Answer is Right
Mallory-Denk bodies are typically found in the hepatocytes of patients with alcoholic liver disease, non-alcoholic steatohepatitis (NASH), and other liver conditions. These bodies are composed of cytokeratin 8 and 18, and ubiquitin. They are a hallmark of hepatocellular damage and are often seen in conditions leading to liver cell injury.
## Why Each Wrong Option is Incorrect
- **Option A:** This option might relate to a condition where Mallory-Denk bodies are found, such as alcoholic liver disease or NASH, which would contain cytokeratin 8, 18, and ubiquitin.
- **Option B:** Similarly, this could be another condition with Mallory-Denk bodies, implying the presence of these proteins.
- **Option C:** This might also represent a condition with Mallory-Denk bodies, thus containing cytokeratin 8, 18, and ubiquitin.
- **Option D:** This option likely represents a condition where Mallory-Denk bodies or similar inclusions are not characteristic, or the composition is different.
## Clinical Pearl / High-Yield Fact
A key point to remember is that Mallory-Denk bodies, which contain cytokeratin 8 and 18 along with ubiquitin, are particularly associated with alcoholic hepatitis and non-alcoholic steatohepatitis (NASH). Their presence can aid in the diagnosis of these conditions.
## Correct Answer: D.