Endosteal scalloping
Dr Frank Gaillard et al.
Endosteal scalloping refers to the focal resorption of the inner margin of cortical bones, typically seen in long bones, due to slow growing medullary lesions. It is important to note that although it is evidence of a slow non-infiltrative lesion, it does not equate to benign aetiology. In fact although the appearance of the cortico-medullary junction of bones affected with myeloma and metastases can look very similar (and the term endosteal scalloping is used by many authors) the underlying mechanism of resorption may well be different 3.
Lesions which typically result in endosteal scalloping include:
- benign
- malignant
- chondrosarcoma (usually low grade)
- skeletal metastases
- multiple myeloma
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