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Malignant haemangiopericytoma of the knee joint: MR findings

Departments of ¹ Radiology, ² Pathology and ³ Orthopaedics, Medical School, Democritus University of Thrace, Alexandroupolis and ⁴ Department of Radiology, Medical School, University of Ioannina, 45110 loannina, Greece

View larger version (73K): [in a new window]   Figure 1. (a) T1 weighted, (b) T2 weighted and (c) fat suppressed T2 weighted sagittal images of the left knee, demonstrating joint effusion and a large intra-articular heterogeneous mass with multiple peripheral serpentine signal voids (arrowheads). An area of highsignal intensity on T1, T2 and fat suppressed T2 weighted images represents sub acute haemorrhage (arrows).

View larger version (104K): [in a new window]   Figure 2. Contrast enhanced T1 weighted axial image demonstrating heterogeneous enhancement of the tumour (arrowheads).

View larger version (104K): [in a new window]   Figure 3. CT scan of the chest demonstrating multiple pulmonary metastatic lesions.

View larger version (159K): [in a new window]   Figure 4. Haematoxylin and eosin histological section of the malignant haemangiopericytoma, showing multiple thin-walled blood vessels surrounded by neoplastic endothelial cells.