Apaprently, Agent Orange exposure does not appear to trigger an increase in any other type of thyroid condition, such as thyroid cancer or nodules. But another interesting finding: apparently, the prevalence of hypothyroidism in those exposed to Agent Orange is actually lower.
Varanasi, Ajay MD, et. al. "Abstract #1046: Are Veterans Exposed to Agent Orange More Likely to Get Graves' Disease?" American Association of Clinical Endocrinology Conference 2010 Abstracts (PDF)
AACE: Agent Orange Ups Some Thyroid Risks -- MedPage Today