This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Radiology
Which tumors suggested by "Trouser leg appearance" on an ascending myelogram? 
Select and explain. 
A. Extradural, B. Extramedullary, C. Intramedullary, D. Vertebral
C: Intramedullary
Answer: C: Intramedullary 
Explanation: Trouser leg appearance on myelography is seen in intramedullary block.