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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

Correspondence: Maria I Argyropoulou MD

The imaging findings of intra-articular haemangiopericytomas have not been described previously. We report on a 35-year-old man with a primary malignant haemangiopericytoma of the left knee joint. MRI demonstrated joint effusion and a heterogeneous mass with haemorrhagic components and multiple peripheral serpentine signal voids, suggesting the presence of vascular channels. Multiple pulmonary metastases were seen on chest CT. These imaging findings, although not pathognomonic, might be useful in suggesting the diagnosis of intra-articular haemangiopericytoma.

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