[Differential diagnostic problems in assessment of benign bone tumors].

The diagnosis of benign bone tumors can cause many problems and a definitive histological diagnosis is often impossible without the knowledge of clinical datas, age of the patient and anatomical location of the tumor. Therefor cooperation between pathologist, orthopedic surgeon and radiologist is necessary, to reduce the risk of misinterpretation of benign and malignant bone tumors. Benign bone tumors often show a heterogenous histology and overlapping morphology between different entities has to be kept in mind, as well as the sampling error in biopsy- and frozen section material. In most cases the pathologist has to rely on conventional stainings because the immunohistochemistry stainings are often not helpful.