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: Ophthalmology
Secondary tumour may spread to the orbit by all the following except 
Select and explain. 
A. Direct spread from lids, B. Blood, C. Lymphatic channels, D. Direct spread from cranial cavity
C: Lymphatic channels
Answer: C: Lymphatic channels 
Explanation: No spread to the orbit by lymphatic channels.