Lip biopsy in connective tissue diseases. A review and study of seventy cases.

The labial salivary glands from seventy patients with systemic lupus erythematosus (twenty cases), systemic progressive sclerosis (twenty-two cases), rheumatoid arthritis (twenty-three cases), and Sjögren's syndrome (five cases) and from fifty subjects without connective tissue diseases were studied by means of light and fluorescence microscopy. The availability of the lip biopsy as a diagnostic tool is stressed, but a differential diagnosis between the different connective tissue diseases was not achieved. Yet some of the latter disclosed peculiar lesions. The role of the inflammatory and degenerative components, as well as the pathogenesis of the lesions, is discussed.