Abstract
Ultrasound in many branches of modern medicine has become a very helpful and proven diagnostic means, whereas in otorhinolaryngology this method up to now rarely has been used as a standard routine examination. Diagnostic A-mode ultrasonography is a useful diagnostic tool in the evaluation of patients with paranasal sinus diseases. It is a simple, reliable and non-dangerous method for the diagnosis and follow up of maxillary sinusitis and the early diagnosis of maxillary tumor.