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ORPHA:52994Disease
What it is
Orbital leiomyoma is a rare benign smooth muscle tumor arising from the walls of orbital vessels characterized by its slow growth and well encapsulated nature. It is usually located in an extraconal position, commonly manifesting with painless proptosis. The tumor is composed of spindle cells arranged in a fibrous stroma rich in dilated sinusoidal capillaries. The nuclei of tumor cells are oval with blunted ends and there are no mitotic figures. Orbital leiomyoma when excised has excellent prognosis for vision and life. One case of orbital leiomyosarcoma that possibly represents sarcomatous change in an orbital leiomyoma following radiation treatment has been reported.
Key facts
- Prevalence
- <1 / 1 000 000
- Age of onset
- Adult
- Inheritance
- Unknown
- Classified as
- Disease
Prevalence figures describe populations, not individuals, and are often estimates from a single study. Where the figure is an incidence or a birth prevalence, it says so.
ICD-10 codes
Related health topics
Reached through the ICD-10 categories this disease is filed under, so these describe the broader group rather than this disease specifically.
Cross-references
Orphadata Science: Free access data from Orphanet. © INSERM 1999. Data version 2026-06-23. Available under CC BY 4.0. This is a reference, not medical advice.
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