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Diffuse Alveolar Damage^*

Uncommon Manifestation of Pulmonary Involvement in Patients With Connective Tissue Diseases

^* From the Division of Pulmonary and Critical Care Medicine (Drs. Parambil and Ryu), Mayo Clinic, Rochester, MN; and Division of Anatomic Pathology (Dr. Myers), University of Michigan Health System, Ann Arbor, MI. Drs. Parambil, Myers, and Ryu have reported to the ACCP that no significant conflicts of interest exist with any companies/organizations whose products or services may be discussed in this article.

Correspondence to: Jay H. Ryu, MD, FCCP, Division of Pulmonary and Critical Care Medicine, Desk East 18, Mayo Clinic, 200 1st St SW, Rochester, MN 55905; e-mail: ryu.jay{at}mayo.edu

Abstract

Background: Diffuse alveolar damage (DAD) is a relatively common finding on surgical lung biopsy and can result from a variety of causes.

Methods: We studied nine consecutive patients with connective tissue disease (CTD) and DAD diagnosed on surgical lung biopsy to examine this association and clinical implications.

Results: The median age was 63 years (range, 35 to 76 years), and seven of the patients were women (78%). Underlying CTDs included rheumatoid arthritis in five patients, polymyositis in two patients, and one patient each with systemic sclerosis and mixed CTD. In seven patients (78%), CTD had been diagnosed before the onset of DAD; six of these patients had a preexisting interstitial lung disease (ILD) related to their CTD. DAD was the presenting manifestation leading to a new CTD diagnosis in two patients (22%). CT of the chest revealed ground-glass opacities and/or consolidation bilaterally with or without honeycombing. In all patients, surgical lung biopsy revealed DAD for which no cause could be identified other than the underlying CTD. Seven patients (78%) were receiving mechanical ventilatory support at the time of the surgical lung biopsy. Four patients (44%) survived to hospital discharge and included one patient with preexisting ILD and all three patients without chronic ILD.

Conclusion: We conclude that DAD can complicate the clinical course of patients with CTD-related chronic ILD, or can occasionally occur as a presenting manifestation of CTDs. When DAD occurs in patients with CTDs, the outcome appears to be worse for those with preexisting chronic ILD compared to those without ILD.

Key Words: connective tissue disease • interstitial lung disease • interstitial pneumonia • lung biopsy • pulmonary fibrosis

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