AbstractOssifying skeletal muscle angiomas are relatively rare occurrences. The preoperative diagnosis is exceedingly difficult, although ossification may be reflected radiologically as a “Swiss cheese” appearance. Two patients are described whose skeletal muscle angiomas contained osseous tissue. The osseus tissue varied from microscopic foci to an abundant amount which was readily recognizable radiologically. The pathologic and radiological features are discussed and these appearances to hemangioma and lymphangioma are presen