Ultrasound is defined as sound a frequency above the upper length of normal hearing (ULKHZ) Ultrasound image are formed from the reflected sound waves(2.5-30 MHz ). Sound waves are generated
The following are different etiolgy leading to head and neck defects: Neoplasia Infection Osteoradionecrosis Congenital defect Trauma Secondary to reconstruction
The maxillary sinus is the first sinus to appear (7-10 weeks) as a shallow groove expanding from the primitive ethmoidal infundibulum into the mass of the maxilla. Abortion and expansion