The infarct of the following organ is invariably hemorrhagic:
**The Organ with Invariably Hemorrhagic Infarct**
**Core Concept**
The question is testing the concept of infarct types and their characteristics in different organs. The correct answer is related to the pathophysiology of infarction, specifically the involvement of blood vessels and the presence of hemorrhage.
**Why the Correct Answer is Right**
The correct answer involves the spleen, which is an organ that is highly vascular and has a rich supply of blood vessels. When the spleen undergoes infarction, the lack of blood flow leads to the breakdown of the fragile blood vessels, resulting in hemorrhage. This is in contrast to other organs, such as the heart, brain, and kidneys, where infarcts are typically ischemic and not hemorrhagic.
**Why Each Wrong Option is Incorrect**
* **Option A:** The liver is a highly vascular organ, but its infarcts are not invariably hemorrhagic. Liver infarcts can be ischemic or hemorrhagic, depending on the cause and location.
* **Option B:** The lungs are also highly vascular, but their infarcts are typically ischemic, not hemorrhagic. Pulmonary infarcts occur when there is obstruction of blood flow to the lungs, leading to ischemia.
* **Option C:** The pancreas is a vascular organ, but its infarcts are not invariably hemorrhagic. Pancreatic infarcts can be ischemic or hemorrhagic, depending on the cause and location.
**Clinical Pearl / High-Yield Fact**
Remember that the spleen is the only organ where infarcts are invariably hemorrhagic due to its high vascular supply and fragile blood vessels.
**Correct Answer: C. Spleen**