Most common site of abscess formation due to amoeba is: September 2005
**Core Concept**
The question is testing knowledge of amoebiasis, specifically the clinical manifestations and complications of *Entamoeba histolytica* infection. Amoebiasis is a parasitic infection caused by *E. histolytica* that affects the gastrointestinal tract and can lead to abscess formation.
**Why the Correct Answer is Right**
The most common site of abscess formation due to amoeba is the liver, specifically the left lobe. This occurs when the amoeba-infected cysts break through the intestinal wall and enter the bloodstream, causing liver abscesses. The liver abscesses are usually solitary and can be quite large, often causing symptoms such as fever, abdominal pain, and weight loss.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because amoebic liver abscesses are more common in the left lobe, not the right lobe.
* **Option B:** This option is incorrect because while amoebic colitis is a common manifestation of amoebiasis, it is not the most common site of abscess formation.
* **Option D:** This option is incorrect because amoebic lung abscesses can occur, but they are less common than liver abscesses.
**Clinical Pearl / High-Yield Fact**
It's worth noting that amoebic liver abscesses can be diagnosed with imaging studies such as ultrasound or CT scans, and treatment typically involves metronidazole or other antiprotozoal medications.
**Correct Answer:** C.