[Primary intermediate hemangioendothelioma of bone: a study of 5 cases].

Objective: To study the radiologic and pathologic features of primary intermediate hemangioendothelioma of the bone.

Methods: Five cases of primary intermediate hemangioendothelioma of bone encountered in the past three years were enrolled into the study. The clinical, radiologic, pathologic and immunohistochemical features of the tumors were reviewed.

[Chondroblastoma occurring in atypical sites].

Objective: To study the clinical, pathologic and radiologic features of chondroblastoma occurring in sites other than epiphysis and apophysis of long bones, and to investigate possible reasons for misdiagnosis.

Methods: The clinical, pathologic and radiologic data of 18 chondroblastoma cases occurring in atypical sites were collected from 5 major hospitals in Shanghai during the past 12 years. S-100 immunostaining was performed to confirm the cartilaginous differentiation of the tumor cells.