Final answer:
The treatment for a large malignant tumor in the neck compressing the trachea is surgery, which aims to remove the tumor mass and relieve the compression.
Step-by-step explanation:
The treatment for a large malignant tumor in the neck that is compressing the trachea would be surgery. Surgery is the primary method to treat most isolated, solid cancers. In this case, the surgery would aim to remove the entire tumor mass and relieve the compression on the trachea. Surgery can help to cure the cancer if it is localized, or at least lessen symptoms and prolong survival if it has spread.