Abstract
We describe in detail a case of the anaplastic large cell lymphoma (ALCL) type of primary bone lymphoma, which initially was diagnosed and treated as osteomyelitis. The diagnosis was delayed because of unspecific clinical symptoms and uncertain radiographs and histology. Only relapse of the lymphoma from the same area with involvement of the soft tissue and local lymph nodes allowed to establish a correct diagnosis and start treatment. Also, in this case, we observed the development of the second cancer (melanoma), which has the same cytogenetic abnormality as ALCL (t[2;5]).