a 4.5 years old boy with left postero superior lateral neck mass admitted to shahid rahnemoon hospital in yazd. the mass had been noticed 2 years ago and there was no improvement after three times antibiotic therapy. on physical examination there were two masses on the neck. one of them was approximately 3×4 cm and the other was 2×2 cm. on of the masses was located in the left posterior auricul...