Dermoid cysts are among the most common congenital orbital lesions. These cysts arise from nests of embryonic epithelium left between fetal lines of closure.
What is orbital dermoid cyst?
Orbital dermoid cysts are congenital lesions representing closed sacs lined by an ectodermal epithelium and comprising the most common orbital mass in children. They are typically divided into deep (within the orbit) and superficial (adjacent to the orbital rim).
What is the difference between dermoid and epidermoid cyst?
Dermoids and epidermoids are ectoderm-lined inclusion cysts that differ in complexity: Epidermoids have only squamous epithelium; dermoids contain hair, sebaceous and sweat glands, and squamous epithelium.
What is an epidermoid tumor?
Epidermoid tumors are benign congenital lesions derived from ectodermal tissue thought to arise because of errors in neural tube closure. These tumors account for approximately 1% of all intracranial tumors but are even rarer in the spine.
Are orbital tumors cancerous?
Orbital tumors can be benign or malignant, and they can be either primary (meaning the tumor originates there) or metastatic (meaning the tumor represents the spread of another cancer elsewhere in the body). Some orbital tumors occur most commonly in children, other types are more often diagnosed in adults.
Are orbital Dermoids cancerous?
A dermoid is a non-cancerous growth of tissue. There are two kinds of dermoids around the eye: orbital and epibulbar. Dermoids may not need to be removed unless they bother a child, affect vision or increase in size. A dermoid may need to be removed surgically.
What does an epidermoid cyst look like?
Epidermoid cysts are often found on the head, neck, back, or genitals. They range in size from very small (millimeters) to inches across. They look like a small bump, and the overlying skin can be skin-colored, whitish, or yellowish in color. They’re filled with cheesy-like, white keratin debris.
What is inside a epidermoid cyst?
An epidermoid, or epidermal, cyst is a small, movable lump under the skin. It forms when surface skin cells move deeper into the skin and multiply. These cells form the wall of the cyst and secrete a soft, yellowish substance called keratin, which fills the cyst.
Is an epidermoid cyst a tumor?
Epidermoid cysts (also called epidermoid tumors) are benign congenital lesions of ectodermal origin. They account for approximately 1% of all intracranial tumors. Although these lesions are congenital, patients are usually not symptomatic until they are 20-40 years of age.
What does epidermoid mean?
Definition of epidermoid : resembling epidermis or epidermal cells : made up of elements like those of epidermis an epidermoid cyst.
What areorbital epidermoids?
Orbital epidermoids form a rare pathological entity that is separate from dermoid cysts. They have variable clinical and radiological presentations and they should be considered in the differential diagnosis of orbital cystic lesions.
What is an orbital dermoid cyst?
Orbital dermoid cysts are congenital lesions representing closed sacs lined by an ectodermal epithelium and comprising the most common orbital mass in children. They are typically divided into deep (within the orbit) and superficial (adjacent to the orbital rim). They comprise ~2% of orbital tumors 5.
What causes an orbital mass with a swollen lid?
Orbital epidermoid cysts are a rare cause of an orbital mass . Patients most commonly present with a mass and lid swelling 1 . Orbital epidermoid cysts can be congenital, acquired (e.g. post-surgery, trauma), or lacrimal gland duct obstruction 3.
What are the radiographic features of dermoid lesions?
Radiographic features. These lesions are usually extraconal, non-enhancing masses with smooth margins, cystic and/or solid components, which are demonstrated on imaging by fat, fluid or soft tissue signal; occasionally calcifications may be present. Ruptured dermoids may show adjacent inflammatory changes.
