D2I2.
rare

Yellow nail syndrome

Yellow nail , also known as "primary lymphedema associated with yellow nails and pleural effusion", is a very rare medical syndrome that includes pleural effusions, lymphedema and yellow dystrophic nails. Approximately 40% will also have bronchiectasis. It is also associated with sinusitis and persistent coughing. It usually affects adults.

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Plain-language summary adapted from Wikipedia. Not medical advice.