It is more common in children under 10 years old and occasionally seen in adults. It often occurs outside the muscular cone, mostly attached to the upper or middle upper part of the orbit, and may be dumbbell-shaped, with parts in both the cranial and orbital regions.

bubble_chart Clinical Manifestations

The eyeball protrudes forward and downward, cannot be repositioned, lacks pulsation, is painless, and vision is mostly normal.

bubble_chart Auxiliary Examination

1. Ultrasound findings: Intraorbital mixed-echo round or oval mass with clear boundaries, visible strong echo clusters, strong sound transmission, and compressibility.
2. CT findings: The tumor has uneven density, may contain fat-density areas, and adjacent bone walls may be depressed or defective. Orbital cavity enlargement is rare.
3. MRI findings: The tumor shows high signal intensity on both T1 and T2 weighted images.

bubble_chart Diagnosis

1. It commonly occurs in areas such as the eyelids, the outer side of the eyebrows, the root of the nose, and the occipital region. The cyst is round, soft, and painless, not adhering to the skin but connected to the deep fascia or bone, making it difficult to move.
2. The contents are porridge-like, thick, and contain shed epithelial cells, sebum, or hair, among other things.

bubble_chart Treatment Measures

Surgical excision. When removing a dermoid cyst in the canthal region, care should be taken as the cyst may sometimes be connected to the dura mater. If the dura mater is accidentally injured and not promptly treated, it may lead to cerebrospinal fluid fistula disease.