This was a satisfying surgery on a rat with an ear tumor. Fortunately, the mass was attached to the margin of the ear, so I was able to remove part of the ear without having to compromise the canal or any major blood vessels or nerves. The black device is a mask that delivers the anesthetic gas. A little lidocaine cream on the surgery site kept this rat from scratching at the ear when it woke up. Total time: 10 minutes! (The length of anesthesia is critical--small critters cool off and can get dehydrated pretty quickly.)
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