On sectioning of an organ at the time of autopsy, a focal, wedge-shaped firm area is seen accompanied by extensive hemorrhage, with a red appearance. The lesion has a base on the surface of the organ. This findings is typically of
First, wedge-shaped infarcts are classic for certain organs. The kidney is one where infarcts are usually wedge-shaped because of the arterial supply. But wait, the description mentions extensive hemorrhage and a red appearance. That makes me think of hemorrhagic infarction.
Hemorrhagic infarcts are more common in organs with dual blood supply or loose tissue structure, like the lungs or intestines. Wait, but the lung's infarcts are usually triangular and have a base on the pleural surface. The red appearance could be due to the presence of blood from hemorrhage.
Wait, the question says the base is on the surface of the organ. So, if it's a lung infarct, which is located at the base (pleural surface) and is red due to hemorrhage. But the question mentions the organ isn't specified. Let me think again.
In the kidney, infarcts are typically pale and wedge-shaped with the base on the cortex. But if there's hemorrhage, maybe it's a different organ. Hemorrhagic infarction in the kidney is less common unless there's trauma or other factors.
Wait, the liver can have infarcts, but they are usually not wedge-shaped. The spleen might have wedge-shaped infarcts, but again, the color. The heart's infarcts are more irregular, not wedge-shaped.
Oh, the lung! Pulmonary infarction is a classic example of hemorrhagic infarction. The base is on the pleural surface, and the infarct is red due to the presence of blood from the bronchial circulation. The wedge shape is because the lung's blood supply is through the pulmonary artery, and when it's blocked, the infarct is triangular with the apex at the central part of the lobe and the base on the pleura. The hemorrhage comes from the bronchial circulation since the pulmonary artery is occluded.
So the correct answer would be pulmonary infarction. Let me check the options. The user didn't list the options, but the correct answer is likely D. Pulmonary infarction. The other options might be other types of infarcts or lesions.
Wrong options could include renal infarction (pale, wedge-shaped without hemorrhage), myocardial infarction (irregular, not wedge-shaped), or hepatic infarction (not typical wedge shape). The key here is the hemorrhage and red appearance, which points to a hemorrhagic infarction, most commonly in the lungs.
**Core Concept**
Hemorrhagic infarction is characterized by a red, wedge-shaped lesion with a base on the organ surface due to blood accumulation from disrupted capillaries. It commonly occurs in organs with dual blood supply or loose tissue architecture, such as the lungs.
**Why the Correct Answer is Right**
Pulmonary infarction is a classic example of hemorrhagic infarction. The lung’s pulmonary arteries are low-pressure vessels, and occlusion (e.g., by embolism) leads to ischemia. The bronchial