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Since the presentation of Osteoid Osteoma as an entity by Jaffe (1935) and the report on 62 cases by the same author (Jaffe, 1945), it has been found in almost all bones. However, it seems according to the review of the cases reported in the literature that the location of the lesion in flat bones is far less common than in the long and short tubular bones or in the short spongy bones. The first case in a flat bone (innominate) was reported by Lewis (1944) and another case was seen by Jaffe (1945). The number of cases reported since then in flat bones is relatively small in comparison with that found in tubular or short spongy bones. Sherman (1947) reviewed 158 cases reported in the literature including 30 of her own. Out of these, three were located in the ilium, none in the scapula. Golding (1954) reviewed 198 cases reported in the literature, out of these 20 of his own. Only four were situated in the pelvic bones, one in the scapula. Flaherty, Pugh and Dockerty (1956) reported 52 cases, estimating the ...

The manifestations of generalised enchondromatosis are multiple enchondromas in the metaphyses of long and short tubular bones, and in flat bones. The skull and vertebrae are relatively spared. The changes are usually bilateral but asymmetrical. The association of enchondromatosis with haemangiomas in Maffucci's syndrome is well known, but unusual manifestations of enchondromatosis are increasingly described. Spranger et al (1978) described two types, one with multiple enchondromas of the long, tubular bones and flat bones, with generalised irregular dysplasia of the vertebral bodies, but only minimal involvement of the phalanges; the second type consisting of generalised evenly distributed enchondromas with severe involvement of the hands and feet, mild platyspondyly and skull deformity. Van Creveld et al (1971) described metaphyseal chondrodysplasia calcificans, which is now accepted as a variant of generalised enchondromatosis. Kaibara et al (1982) described generalised enchondromatosis with haemangiom...