Assuming it doesn't need to be medically accurate:
A desaturated, high contrast mash up of various organic looking images such as steak or pork chops and similar, could be masked and animated around with additional distortion ripple and wave effects (of various sizes). Couple this with a liberal sprinkling of gaussian noise to add grain at various levels in the comp should do the trick!
I can image a fair bit of tweaking needed but I can't imagine it to be too difficult! (having said that challenges tend to look more inviting on the outside!!)
Love to see some results when you have them!
3D animator and VFX specialist