This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Lung Tumor, Subject name: Pathology
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? 
Select and explain. 
A. Squamous cell variant, B. Adenocarcinoma variant, C. Small cell variant, D. Large cell variant
C: Small cell variant
Answer: C: Small cell variant 
Explanation: Basophilic staining of vascular walls due to encrustation by DNA from necrotic tumor cells is given name as Azzopardi effect associated with small cell variant of lung cancer. It has neurosecretory granules which release DNA material from tumor cells resulting in Azzopardi effect.