What is the shrinking lung syndrome in lupus?

A rare feature of lupus, that sounds worse than it is, is called the "shrinking lung syndrome. The symptoms are shortness of breath, and often some chest pain when breathing deeply. X-rays and CAT scans show small, clear lungs.

Breathing ( pulmonary function) tests demonstrate stiff lungs. Sometimes the diaphragm, the big muscle beneath the lungs, is elevated, reducing lung size.

Lack of good chest expansion and poor motion of the diaphragm are two possible reasons for the decreased lung function.

Generally the prognosis is good, though increased lupus treatment with steroids and immune suppressing medication may be needed.

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