CT diagnosis and differential diagnosis of perivascular epithelioid cell tumor
10.13491/j.issn.1004-714X.2025.01.015
- VernacularTitle:血管周上皮样细胞肿瘤的CT诊断及鉴别诊断
- Author:
Yongmei YU
1
;
Xiangyu HAN
2
;
Qiyun XING
3
;
Haiyang YU
3
Author Information
1. Department of Computed Tomography, Jining No.1 People’s Hospital, Jining 272000 China.
2. Emergency Department of Jining No.1 People’s Hospital, Jining 272000 China.
3. Clinical Medical College, Jining Medical University, Jining 272013 China.
- Publication Type:OriginalArticles
- Keywords:
Perivascular epithelioid cell neoplasms;
Tomography;
Spiral computed;
Kidney;
Liver;
Retroperitoneal;
Extraperitoneal
- From:
Chinese Journal of Radiological Health
2025;34(1):91-95
- CountryChina
- Language:Chinese
-
Abstract:
Objective To explore the CT diagnosis and differential diagnosis of perivascular epithelioid cell neoplasms (PEComa), improve the accuracy of PEComa diagnosis, and reduce misdiagnosis. Methods CT findings of 8 cases of PEComa confirmed by pathology in Jining First People’s Hospital from January 2020 to April 2024 were retrospectively analyzed for the location, shape, size, boundary, plain scan density, and enhancement characteristics of the lesions. Results All 8 tumors were solitary, with 5 located in the kidney, 1 in the liver, 1 in the extraperitoneal space, and 1 in the retroperitoneal space. The tumors were round in 3 cases, oval in 1 case, and irregular in 4 cases. Seven cases were benign with clear boundaries and 1 case was malignant with unclear boundaries. On plain CT, 2 cases showed slightly low density, 3 cases showed slightly high density, and 3 cases showed low density. One tumor had uniform density, and 7 tumors had nonuniform density with internal necrosis and cystic changes. Contrast-enhanced CT revealed diverse enhancement patterns. Four cases showed a “fast in and fast out” enhancement pattern, with significant arterial-phase enhancement and reduced portal venous-phase enhancement. Three cases showed a “fast-in and slow-out” enhancement pattern, with significant enhancement in the arterial phase, persistent enhancement in the portal venous phase, and slightly reduced density in the delayed phase. One case showed mild enhancement in the arterial phase and significant enhancement in the portal venous phase. In 3 cases, multiple tortuous and thickened blood vessels were observed around the tumors, while 3 cases showed tortuous vascular shadows within the tumors. Conclusion PEComa demonstrates characteristic CT features, predominantly with “fast in and fast out” or “fast in and slow out” enhancement patterns. When thickened and tortuous blood vessels are observed within or around the tumor, PEComa should be considered in combination with clinical findings.
