Basophilic staining of vascular walls due to encrustation by DNA from necrotic tumour cells is seen in which of the following variants of lung cancer?
**Core Concept**
The question is testing knowledge of a specific histopathological feature associated with a particular variant of lung cancer. The underlying principle involves the interaction between necrotic tumor cells and the vascular walls, leading to a characteristic staining pattern.
**Why the Correct Answer is Right**
The correct answer is related to a type of lung cancer that is known for its aggressive behavior, rapid growth, and propensity for necrosis. The DNA from necrotic tumor cells can encrust the vascular walls, leading to basophilic staining due to the presence of nucleic acids. This feature is a characteristic diagnostic clue for the correct answer. The vascular invasion and necrosis are hallmarks of this type of lung cancer.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it is a type of lung cancer that is typically associated with smoking and is known for its central location in the lung, but it is not characteristically associated with vascular invasion and necrosis.
**Option B:** This option is incorrect because it is a type of lung cancer that is typically associated with a better prognosis and is often found in the periphery of the lung, but it is not characteristically associated with vascular invasion and necrosis.
**Option D:** This option is incorrect because it is a type of lung cancer that is typically associated with a worse prognosis, but it is not characteristically associated with vascular invasion and necrosis in the same way as the correct answer.
**Clinical Pearl / High-Yield Fact**
This type of lung cancer is often referred to as "small cell carcinoma" due to its small cell size and aggressive behavior. It is a highly malignant tumor that requires prompt diagnosis and treatment.
**Correct Answer:** C. Small cell carcinoma of the lung.