Normal to increased kidney size is seen in all of the following except: September 2008
**Core Concept**
Kidney size can vary depending on several factors, including age, sex, and underlying conditions. In general, kidney size can range from small to large, and this variation can be influenced by various physiological and pathological processes.
**Why the Correct Answer is Right**
Kidneys can increase in size due to conditions such as polycystic kidney disease, where multiple cysts form on the kidneys, causing them to enlarge. Similarly, conditions like nephrotic syndrome, where there is an excessive loss of protein in the urine, can lead to an increase in kidney size. Additionally, physiological changes such as pregnancy can also cause an increase in kidney size.
**Why Each Wrong Option is Incorrect**
**Option A:** While pyelonephritis can cause scarring and shrinkage of the kidney, it is not typically associated with an increase in kidney size. **Option B:** Chronic kidney disease can lead to a decrease in kidney size due to fibrosis and scarring. **Option C:** Nephroblastomatosis is a condition characterized by the presence of embryonal cells in the kidney, which can cause an increase in kidney size.
**Clinical Pearl / High-Yield Fact**
It's essential to note that kidney size can be an important diagnostic clue in various conditions. For example, a significantly enlarged kidney may suggest conditions like polycystic kidney disease, while a small kidney may indicate chronic kidney disease or pyelonephritis.
**Correct Answer: B. Chronic kidney disease often leads to a decrease in kidney size due to fibrosis and scarring.**