Can vitamin B12 deficiency cause Musculocutaneous nerve and ILiohypogastric nerve damage?

Causes neuropathy. But unusual to have an isolated mononeuropathy over arm and abdomen. If indeed this pattern of isolated nerve involvement fits a mono neuritis multiplex, one would wonder about another responsible disorder such as diabetes or arteritis. Vit B-12 problems are typically symmetrical and distal. Might investigate all of this further with your neurologist.