[Diffuse infiltrating lung disease secondary to antisynthetase syndrome: a case report].

Diffuse infiltrate lung diseases (DILDs) are frequent in patients with connective tissue diseases. They can be suggestive of connective tissue diseases or occur during follow-up. Antisynthetase syndrome (ASS) is a complex and heterogeneous connective tissue disease. Antisynthetase antibodies, in particular the anti-Jo1 antibody, are found in patients with this syndrome. The prognosis of ASS is conditioned by the occurrence of DILD and its severity, thus guiding therapeutic management. We here report the case of a 57-year-old female patient presenting with acute febrile DILD revealing ASS. Outcome was favorable under bolus corticosteroids in combination with cyclophosphamide treatment.