The bands found in your csf and blood serum are a big find. Those oligoclonal bands are present in both if you have some sort of autoimmune or inflammatory condition going on. The bands may be identical or dissimilar.
From what I've read, if the bands are in your csf but not your serum, it could be indicative of MS. If they are in both and are identical, it points more towards autoimmune disorders. The following may be of interest (copied/pasted):
The presence of oligoclonal bands (OCBs) of immunoglobulin G (IgG) in CSF provides evidence for the occurrence of a humoral immune response, but it is not always appreciated that the oligoclonal IgG may have originated in the serum. To determine the diagnostic significance of serum OCBs 146 patients with serum OCBs were identified among 1874 patients with suspected neurological disorders (7.6%). Clear diagnoses had been made in 112 of these patients: in 56 identical CSF and serum bands were present, revealing a systemic immune response, while in 46 additional unique CSF bands indicated that intrathecal IgG synthesis was also occurring. In the first group neoplasia and peripheral neuropathies accounted for over 50% of the diagnoses, infections and systemic inflammatory disorders for 32%, and multiple sclerosis was diagnosed in only one case. These figures contrast considerably with those reported for patients with CSF OCBs alone. Diagnoses in the second group of patients, with unique CSF OCBs in addition to serum OCBs, resembled those among patients with CSF OCBs alone. Examining CSF and serum in parallel for OCBs of IgG provides more diagnostic information than examining CSF alone, and the latter is potentially misleading.
Here's another copy/paste blurb on the subject:
The IgG immunofixation patterns of CSF and serum from the same patient are then visually compared.
This allows detection of oligoclonal banding that represents intrathecal synthesis of immunoglobulins. Five different patterns may be seen after the isoelectric focusing (see Fig. below):
Type 1: Normal CSF, no band present in the CSF.
Type 2: Intrathecal IgG synthesis. CSF with restricted oligoclonal bands not seen in the serum, found in multiple sclerosis.
Type 3: Intrathecal IgG synthesis: CSF with restricted oligoclonal bands with additional bands seen in both the CSF and serum. It is found in multiple sclerosis and brain inflammation in systemic disease, for example, sarcoidosis.
Type 4: Identical oligoclonal bands in the CSF and serum. Monoclonal bands found in systemic inflammation, for example, Guillain-Barrè syndrome.
Type 5: Monoclonal bands in both the CSF and serum. It is found in myeloma or monoclonal gammopathy of uncertain significance.
And finally, click on this url for a graphic on the bands:
Oligoclonal Band | Antibody Patterns
As a Post Script, go to this url for a really nice, clear graphic at the bottom of the page:
http://www.interlab-srl.com/microgel08/microgel-csf.htm