I had an mri of my upper spine. could anyone tell me what this means: c6-c7 minimal posterior disc bulge minimally indents the anterior therapy sac.

Anterior THECAL sac: Is the "front" of the spinal canal, in which the spinal cord and spinal nerves lie. Minimal posterior disc bulge means there is a little stretching of the disc between the cervical (neck) vertebral bodies at the c6-c7 level. According to your question, this bulge is at the "back" of the vertebra, and minimally indents (pushes in) the anterior thecal sac. These bulges range from minimal to severe.

Disc pressing nerve: If a disc herniation is large enough, it may compress the thecal sac, which surrounds the spinal cord.