Are hip osteoarthritis and carcinomatous metastasis mutually exclusive?

A case of hip osteoarthritis is reported, in which histological investigation demonstrated the absence of tumoral involvement in femoral head in spite of nearby intraosseous carcinomatous metastasis. It comes in addition to a previously reported similar personal case. Further studies of surgical or post-mortem specimens are needed to indicate whether these observations were fortuitous or whether the two conditions might not even be mutually exclusive.