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Good morning. I'm sorry to hear you and Marcello have had such a rough time after the surgery. It's hard for me to judge the need for IV pain meds and antibiotics under these circumstances but I can tell you that cats heal from infection very well in most cases and even a hole that size will tend to heal although it may take several weeks. While I'm sure it looks rough, trust me that with time the surgery site will heal. As for IV antibiotics, it is extremely rare that I put any patients on IV antibiotics for a surgery like this because the length of time to heal is too long to continually give them. Oral antibiotics or long acting injections of antibiotics (under the skin) are my treatment of choice. The only time I use IV antibiotics is when there is clear sepsis and body wide infection and it doesn't sound like that is the situation with Marcello. Based on what you've described, I think he will just fine. As for the oncologist, they honestly won't be able to tell you much of anything useful until they've got the results of the testing, before that everything is pure conjecture.