To the Editor.—
The article "Laboratory Tests in Chronic Urticaria" describes the study by Jacobson et al (1980;243:1644) that found radiologically determined sinusitis to be an important factor in chronic urticaria. It would be of interest to know which sinuses were involved.
Altman J. Urticaria and Sinusitis. JAMA. 1981;245(1):29. doi:10.1001/jama.1981.03310260013006