FEW cases with segmental lesions of the retinal arteries have been described. Suganuma (1927) reported a case with retinal perivasculitis, giving the pathological findings in an enucleated eye. Kyrieleis (1933) gave the first description of periarteritis retinae occurring in uveitis. Muncaster and Allen (1939), Thompson (1952), and Griffin and Bodian (1959) described five further cases. Another three cases are described below.