Primary angiosarcoma of bone. A case report.

Background: Primary malignant vascular tumors of bone are very rare accounting for less than 1% of primary bone malignancies. They are characterized by unknown etiology, variable biologic behavior and histological appearance. Angiosarcoma is an aggressive malignant vascular tumor derived from mesenchymal cells with endothelial differentiation.

Pilot study of intraoperative digital imaging with the use of a mammograph for assessment of bone surgical margins in the head and neck region.

Aim: To investigate alternative possibilities for the intraoperative evaluation of surgical margins after bone resection utilizing more conventional hospital infrastructure technologies.

Materials And Methods: A small pilot study was performed using digital mammograph imaging intraoperatively on 16 surgical specimens of bone tumours or malignancies with bone infiltration of the head and neck area, with the aim of evaluating the resection margins.

Results: In thirteen cases the intraoperative specimen images indicated clinically complete excision.

Posterior mediastinal Castleman's disease presented as hypervascular lipomatous tumor.

Castleman's disease (CD) is a rare lymphoproliferative disorder most often found in the chest. Herein we describe the imaging findings of a histologically proven case of CD involving the posterior mediastinum in a 41-year-old asymptomatic man presented as a well-defined hypervascular lipomatous tumor. To our knowledge less than 10 cases of posterior mediastinal CD have been reported so far and this is the first case of CD mimicking mediastinal lipomatous tumor.