LOIN PAIN-HEMATURIA SYNDROME WITH A DISTINCTIVE VASCULAR LESION AND ALTERNATIVE PATHWAY COMPLEMENT ACTIVATION

We describe a 48-year-old woman with loin pain-hematuria syndrome. Her renal abnormalities included conspicuous microaneurysmal and glomerul oid (plexiform) angiomatous changes. The deposition of both properdin and the C5b-9 complex, as well as the usual C3, in arterioles argues f or complement activation. To our knowledge, neither of these features has been previously described. We speculate about the cause of loin pa in-hematuria syndrome and note the uncommonness of this entity in the United States as opposed to Great Britain.