In case my message didn't go through:
I don't really understand your question. Assuming that you want to do a pathology major, in order to keep hopes for MD alive (assuming once more), you are asking if you can complete a Master of Engineering with that major. Yes you can.
HOWEVER, in order to be eligible to enter the MEng, you have to do Calculus 2 and Linear Algebra (first year math courses. If you havent done Specialist, you need to take Calculus 1 before Calculus 2). You also have to take 2 sciences (Phyics 1, Physics 2, etc) relating to the discipline. Also a 65% average in year 2 and 3 is required irrespective of major.
If you take this pathway however, your Engineering Masters will be 3 years long, not 2. I repeat, 3 years. That adds up to 6 years at university. If you want to know more about admission, go here:
http://www.eng.unimelb.edu.au/study/graduate/Click on a discipline and it will state it's prerequisites.
Hope I helped.