Hello, thanks for your question today! I am Dr. Drew, and I am a licensed veterinarian. I'll be happy to help you in any way I can.
An x-ray is not typically going to provide a 100% accurate diagnosis of cancer -- it can only point us in that general direction.
Finding one or more masses or lumps in the chest can indicate cancer, but it can also indicate other non-cancerous conditions.
A biopsy of one of the masses is the only way to know whether it's cancer or something else.
I would be happy to look at the images for you.
you can upload them to any of the free photo sharing sites such as imageshack, photobucket, etc or if you have difficulty doing so, you can contact customer service on this site to help with sending them to me.
Sorry I have no idea on how to send it trhough imageshack etc... Can I send the images to a private E-mail address as I could do with another pair of eyes to look at them?