--a Skin biopsy report that goes into detail about blood vessels and glands along with the information about density and condition of nerve fibers.

It might make sense, though, for a small fiber neuropathy of long standing to result in the "withering" of other structures that the small nerves ennervate, since if they are not functioning signals cannot adequately get back and forth to them.

However, that report does sound as if there is some vasculitic autoimmune process involved. The ANA related autoimmunities, which do include lupus, Sjogren's, Bechet's, Churg-Strauss, and a host of other syndromes do often involve an attack on the components of blood vessels and glandular structures such as sweat glands, as well as neuropathies.

I'll have to research this further--can you tell us where the results were interpreted (which hospital/research facility)?