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Retroperitoneal malignant mesenchymoma: imaging findings in five cases
1Department of Radiology, Teikyo University School of Medicine, 2-11-1 Kaga, Itabashi-ku, Tokyo 173, Japan.
Abdominal Imaging
|February 6, 1999
Summary
Radiologists describe imaging findings for retroperitoneal malignant mesenchymoma. Large, heterogeneous masses with calcifications on CT, US, MR, and angiography are typical signs.
Area of Science:
- Radiology
- Oncology
- Medical Imaging
Background:
- This study details the imaging characteristics of retroperitoneal malignant mesenchymoma.
- It focuses on computed tomographic (CT) findings, but also includes magnetic resonance (MR), ultrasonography (US), and angiography.
Observation:
- Five patients with pathologically confirmed retroperitoneal malignant mesenchymoma underwent imaging.
- Imaging modalities included CT (5), US (4), angiography (4), and MR (2).
Findings:
- Tumors were typically large (>10 cm), well-circumscribed, and heterogeneous.
- Massive intratumorous calcifications were noted on plain CT/US in 3 patients.
- Contrast-enhanced CT showed heterogeneous enhancement; angiography revealed moderate hypervascularity.
- MR imaging demonstrated hypointensity on T1-weighted and hyperintensity on T2-weighted images.
Implications:
- The combination of large, expansile, heterogeneous retroperitoneal masses with significant calcifications is characteristic of malignant mesenchymoma.
- These findings aid in the diagnosis and differentiation of retroperitoneal tumors.