A thyroglossal cyst is a fibrous cyst that forms from a persistent thyroglossal duct. Thyroglossal cysts can be defined as an irregular neck mass or a lump which develops from cells and tissues left over after the formation of the thyroid gland during developmental stages
A cystic hygroma is a fluid-filled sac that results from a blockage in the lymphatic system . It is most commonly located in the neck or head area, but can be located anywhere in the body. It may be discovered in a fetus during a pregnancy ultrasound , or it may be apparent at birth as a soft bulge under the skin.
A complication of tonsillitis in which the infection spreads behind the tonsils.
A peritonsillar abscess occurs when a collection of pus forms and infection spreads beyond the tonsils into the neck and chest. Swollen tissues can block the airway.
References- Shafers book of oral pathology 3rd edition
– a.k. tripathi for general medicine 3r