[Adamantinoma of long tubal bones].

Four cases of adamantinomas of the long tubular bones, ulna and femur among them which rarely occur in patients aged 18-64 years (one female) are reported. A late metastasis to the sacrum was observed in one case. Typical diagnostic errors are described. Electron microscopy data are provided. Immunohistochemistry helps in differential diagnosis of this tumor. Histology does not give too much for the prognosis, radical resection does not influence the incidence of recurrences and metastases. The surgeons should be warned against enucleation of the tumor.