TPO and membranous glomerulonephritis: While Hashimoto’s thyroiditis is reported to cause glomerular involvement in 10-30% of affected patients, and a secondary membranous nephropathy in 20% of such patients, there are very limited reports of Graves’ disease causing secondary membranous nephropathy and evidence that renal deposition of thyroglobulin or thyroperoxidase may be involved in these cases [1,2].