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A dermoid cyst is a teratoma of a cystic nature that contains an array of developmentally mature, solid tissues. It frequently consists of skin, hair follicles, and sweat glands, while other commonly found components include clumps of long hair, pockets of sebum, blood, fat, bone, nail, teeth, eyes, cartilage, and thyroid tissue.
An unusual variant is the cervical ranula (also called a plunging or diving ranula), where the swelling is in the neck rather than the floor of the mouth. [1] The term ranula is also sometimes used to refer to other similar swellings of the floor of mouth such as true salivary duct cysts, dermoid cysts and cystic hygromas. [1]
[1] [2] [3] They are a type of germ cell tumor (a tumor that begins in the cells that give rise to sperm or eggs). [4] [8] They are divided into two types: mature and immature. [4] Mature teratomas include dermoid cysts and are generally benign. [8] Immature teratomas may be cancerous. [4] [9] Most ovarian teratomas are mature. [10]
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The most common mediastinal masses are thymoma (20% of mediastinal tumors), usually found in the anterior mediastinum, followed by neurogenic Timor (15–20%) located in the anterior mediastinum. [1] Lung cancer typically spreads to the lymph nodes in the mediastinum.
The type of cyst Williams had is different from the everyday cysts people usually encounter. A branchial cyst, according to the Cleveland Clinic, is a small fluid-filled sac that may look like a ...
The cyst wall is composed of squamous epithelium (90%), columnar cells with or without cilia, or a mixture of both, with lymphoid infiltrate, often with prominent germinal centers and few subcapsular lymph sinuses. The cyst is typically surrounded by lymphoid tissue that has attenuated or absent overlying epithelium due to inflammatory changes.
A thyroglossal cyst or thyroglossal duct 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. [1]