Abstract
Recurrence of sarcoidosis in lung allografts is an interesting model to study the pathogenesis of this disease. We report a case of sarcoidosis recurrence in a single lung allograft recipient 2 years after transplantation. The expression of tumour necrosis factor-alpha (TNF-alpha) gene by alveolar macrophages was monitored. The TNF-alpha gene was not expressed at the time of recurrence of sarcoidosis, but only later when prominent granulomas were observed.