Epithelioid cyst
Introduction
Introduction to epithelioid cyst Epithelioid cysts are benign tumors in cerebral cysts, often occurring outside the eye muscle cone. They are attached to the upper or upper iliac wall of the iliac crest. They can be dumbbell-shaped, with a part inside the skull and the iliac crest. The dermoid cyst is a congenital disorder, which occurs in the face, the outside of the eyebrow, the nose, the occiput, and so on. It can be surgically removed and hydrocortisone is used in the operation to reduce the occurrence of postoperative traffic hydrocephalus. basic knowledge The proportion of illness: 0.005% Susceptible people: no special people Mode of infection: non-infectious Complications: cerebrospinal fluid leakage meningitis
Cause
The cause of epithelioid cyst
The dermoid cyst is a congenital disorder. The cause is unknown. The dermoid cyst originates from ectopic embryonic epithelial cells and is the result of bringing some skin tissue into the early stage of embryonic development (3 to 5 weeks) when the nerve groove is closed. The dermoid cyst is generally spherical or lobulated, with a smooth surface, a thick wall, a clear boundary, and a firm adhesion to the brain tissue. A few have calcification, the capsule contains oily substances, pale yellow or grayish yellow, viscous semi-solid state, which can have hair, teeth are rare. The outer layer of the wall is a small amount of fibrous tissue, not only the epidermis but also the dermis and its hair follicles, sebaceous glands and sweat glands and other skin attachments, cartilage and bone tissue can be seen in the tumor wall.
Prevention
Epithelioid cyst prevention
1. Despite the removal of sufficient tumors, postoperative imaging studies have shown that brain stem deformation persists. Radiation therapy is not considered after surgery because the tumor is benign and radiation therapy does not prevent recurrence.
Because of the slow growth of the dermoid cyst, even partial resection can be relieved for a long time. The operative mortality rate is between 0% and 2.6%. The cause of death is mainly postoperative aseptic meningitis. Therefore, if this complication can be prevented, the prognosis is mostly good.
2. There are currently no effective preventive measures.
Complication
Epithelioid cyst complications Complications Cerebrospinal fluid meningitis
Attention to surgical complications:
1. When removing the dermoid cyst at the corner of the eye, it should be noted that sometimes the cyst is connected with the dura mater. If the dura mater is accidentally injured and not treated in time, cerebrospinal fluid leakage may form.
2. Care should be taken to avoid spillage of the epithelioid cysts, as these substances are highly irritating and can cause severe chemical meningitis (Mollaret's meningitis).
Symptom
Epithelioid cyst symptoms Common symptoms Cerebrospinal fluid rhinorrhea subcutaneous cyst meningitis
1. Occurs in the face, the outside of the eyebrow, the nasal roots, the occipital area, etc. The cyst is round, soft and painless, and has no adhesion to the skin, but it is not easy to push with the deep fascia or bone.
2. The contents are atherogenic, thick, containing exfoliated epithelial cells, sebum or hair.
Examine
Examination of epithelioid cysts
1.B super performance: the echoes in the circle are circular or elliptical, and the boundary is clear. The strong echo group is visible, and the sound is strong and compressible.
2. CT manifestations: the density of the tumor is uneven, there may be a fat density zone, the adjacent bone wall may be concave or defective, and the cavity enlargement is rare.
3. MRI findings: Both tumor T1 and T2 weighted images have high signal intensity.
Diagnosis
Diagnosis and identification of epithelioid cyst
diagnosis
Through imaging examination and postoperative pathological examination, the disease can be diagnosed and diagnosed.
Differential diagnosis
1. Cerebral cyst: refers to a condition in which brain tissue and its appendages form a water cystic mass and produce different degrees of brain pressure symptoms. Brain cysts generally refer to arachnoid cysts, dermoid cysts and epithelioid cysts, all of which are benign lesions. Generally asymptomatic, there may be symptoms such as headaches.
2. Intracranial tumors: various brain tumors, which are one of the common diseases in the nervous system and have great harm to the function of the human nervous system. Generally divided into two major categories of primary and secondary. Primary intracranial tumors can occur in brain tissue, meninges, cranial nerves, pituitary gland, residual blood vessel tissue, and the like. Secondary tumors refer to metastasis of malignant tumors in other parts of the body or invasive metastases formed in the brain. Brain tumors, also known as intracranial space-occupying lesions. General head CT, MRI can be diagnosed.
