In that case...... (are these human or animal, anyway I am a vet so I didn´t get too frightened...) I think the G11 is a good choice because:
- one of the smallest cameras with swivel LCD
- the lens adaptor tube (available from $15) protects the lens from contamination, and makes it very easy to cover the camera with a plastic bag or wrap, fixed with an elastic band over the end of the tube. With the camera covered this way, the lens can freely move inside the tube. At the end of the tube you can put a simple UV filter for even more protection of the lens.
For illumination I would use a headlamp. I have one from Petzl, with several light intensities, several vertical positions, and you can easily change the position on your head, while you keep your both hands free, or you can use an additional flashlight in one hand. Ring or other flashes take space and easily get contaminated.
I would put the camera in flexizone AF (one moveble focus point), then if necessary choose the right focus point position on screen, depending on the freedom you have to move the camera. Try first normal focus, if you don´t get focus, try macro focus (left option on 4-way controller), and there is your picture! You can of course give manual focus a try. When you get experience you can put the manual focus on a certain distance, and vary the camera-subjet distance to get focus. The distance given on screen is altered by the closeup lens, but it works if you adjust.
Still i would advise you to get a set of simple closeup lenses, like +4 and 2. These can be stacked. The +2 can also be used as a protective lens, on its own it interferes very little. Working distance for +4 is about 25 cm, for +6 it is 16 cm, which is probably adequate for body cavities. The big advantage with these lenses is that you can zoom in or zoom out to get the kind of overview or detail you want. In wide angle you will see some vignetting.
Apart from your G11 this would be a less than $100 investment!