Limbal allergic granulomatosis.

Four limbal diseases characterised by granuloma formation as part of an allergic response are discussed. A series of histological specimens from patients with Wegener's granulomatosis were re-examined. Genuine granulomatous disease at the limbus is rare, only occurring in two patients, whilst secondary, more non-specific limbal active chronic inflammation was more common. Comparisons between this disease, Churg Strauss allergic angiitis, some varieties of Mooren's ulcer and allergic granulomatous nodules were made. The role of the mast cell in promoting this eosinophilic leucocytic mediated group of disease is discussed briefly.