A 57-year-old woman says that for the past 30 years she has been aware of thickening, reduction in the growth rate, and yellow discoloration of the nail beds of her fingers and toes. Nail clippings were cultured about 10 years ago, but no fungus was isolated. About 7 years after she first noticed the nail changes, she developed pitting edema of the ankles without evidence of cardiac failure, and she was put on a diuretic.
A chest radiograph taken 8 years ago during a health examination was normal. However, 1 month before admission to our department, she began experiencing exertional dyspnea, with productive cough but no fever.
She has never traveled abroad, has no history of hypertension or ischemic cardiomyopathy, has never undergone surgery, and has no history of tuberculosis.
EXAMINATION AND TESTING
Q: Which of the following is the most likely diagnosis?
- Cardiac failure
- Yellow nail syndrome
- Neoplastic disease
A: The correct diagnosis is yellow nail syndrome, a rare disorder characterized by yellow nails, lymphedema, and chronic respiratory manifestations. However, patients rarely present with all three parts of the triad, and fewer than half of patients present with pleural effusions.
The respiratory manifestations of yellow nail syndrome are diverse and include pleural effusion, bronchiectasis, rhinosinusitis, chronic cough, and recurrent lung infections. Furthermore, this syndrome is in the differential diagnosis of chronic pleural effusions lasting more than 1 year, and also of bronchiectasis and rhinosinusitis.
The pathophysiology of yellow nail syndrome remains unclear, but various anatomic or functional lymphatic drainage abnormalities have been proposed as the underlying cause.
Therapy includes bronchopulmonary hygiene (eg, postural drainage); inhaled steroids and antibiotics to control exacerbations of symptoms; serial thoracocentesis or pleurodesis to control pleural effusions; and lymphatic drainage and diuretic drugs for lymphedema. Some experts propose vitamin E for the treatment of yellow nails, but yellow nails often improve spontaneously.
In this case, the diagnosis of yellow nail syndrome was based on the presence of its three major features. She had no history of hypertension or ischemic cardiomyopathy, and no echocardiographic signs of cardiac failure. She had no signs of infection or malignancy and had never taken antirheumatic drugs such as d-penicillamine (Cuprimine, Depen), which can cause pleural effusion, and nothing in her history or presentation suggested an immunosuppressed state.
Her treatment involved thoracocentesis to reduce the pleural effusion, correction of her nutritional status, a low-salt diet, vitamin E supplementation, and diuretics. At discharge, her pleural effusion and lymphedema were reduced, and her dyspnea had resolved.