In pyogenic liver abscess commonest route of spread is:
**Core Concept**
Pyogenic liver abscess is a type of liver infection caused by bacteria, typically resulting from the spread of infection from another part of the body. The liver's unique anatomy, including its dual blood supply from the hepatic artery and portal vein, makes it susceptible to infection via the bloodstream.
**Why the Correct Answer is Right**
The most common route of spread for pyogenic liver abscess is through the bloodstream (hematogenous spread). This occurs when bacteria from a distant site of infection, such as the lungs or skin, are carried to the liver via the bloodstream. The liver's rich blood supply, particularly from the portal vein, allows bacteria to colonize and cause infection in the liver tissue. The bacteria can then multiply and form an abscess.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is not listed, so we will proceed with the remaining options.
* **Option B:** Although the biliary system can be a route of spread for certain types of liver infections, such as ascending cholangitis, it is not the most common route for pyogenic liver abscess.
* **Option C:** Direct spread from adjacent organs, such as the gallbladder or stomach, can occur but is less common than hematogenous spread.
**Clinical Pearl / High-Yield Fact**
The liver's dual blood supply, from both the hepatic artery and portal vein, makes it prone to infection via the bloodstream. This is a key concept to remember when considering the diagnosis and treatment of pyogenic liver abscess.
**Correct Answer: C. Direct spread from adjacent organs is less common.**