Rhabdomyoma of the orbit in a child.
OBJECTIVE
To study a case of rhabdomyoma of the orbit in a 16-month-old boy.


METHODS
The child had progressive right proptosis for 1 month. He underwent a computed tomographic scan, which showed an irregular right retrobulbar mass and partial resection.


RESULTS
Histologic examination disclosed well-differentiated striated muscle cells with a mixture of collagen fibers and immature striated muscle cells with centrally placed nuclei. The specimen lacked nuclear atypia, indicating benign rhabdomyoma of the orbit. During the 1 1/2-year follow-up, the patient did not receive additional treatment, and no regrowth occurred.


CONCLUSIONS
Rhabdomyoma can occur in the orbit of a child. Because of differences in treatment, rhabdomyoma must be distinguished from rhabdomyosarcoma.
Hatsukawa
Y
Y
Department of Ophthalmology, Osaka Medical Center, Japan.
Furukawa
A
A
Kawamura
H
H
Sugimoto
S
S
Mushiake
S
S
Morimoto
K
K
D006801:Humans; D007223:Infant; D008297:Male; D009918:Orbital Neoplasms / Q000000981:diagnostic imaging* / Q000473:pathology* / Q000601:surgery; D012207:Rhabdomyoma / Q000000981:diagnostic imaging* / Q000473:pathology* / Q000601:surgery; D014057:Tomography, X-Ray Computed