Successful resection of a huge retroperitoneal venous hemangioma: A case report

Table 2 Imaging features of included literature

Ref.	Age	Sex	Location	Imaging studies
Powis and Rushton[18]	26	F	Right abdomen	Intravenous pyelography show a soft-tissue mass compressing and displacing the ureter
Igarashi and Hanazaki[6]	28	M	Left lumbar	CT show a papillary structured mass in the left peritoneum, and slight enhancement in the late phase of the enhanced CT. Ultrasonography show a hyperechoic mass lesion
Martín-Fernández[5]	39	NM	Right abdomen	Ultrasonography and CT show a solid-cystic mass with septations
Pérez Martín[4]	26	F	Left lumbar	Ultrasonography and CT show a retroperitoneal solid cystic polylobulated mass
Tseng et al[19]	61	F	Retroperitoneum	Ultrasonography and CT show heterogeneous mass
Forbes[11]	75	M	Left retroperitoneum	CT show left-sided retroperitoneal hemorrhage
Choi and Oh[14]	29	F	Right abdomen	Ultrasonography show a hypoechogenic mass, and CT show irregular shaped mass with internal multiple small calcifications (phleboliths)
Kobayashi et al[13]	54	M	Left Retroperitoneum	CT show a cystic mass with the thickened wall having a contrast enhancement
He et al[7]	38	M	Right upper quadrant	Ultrasonography showed a giant cystic mass, and CT show a low density mass with mild enhancement
Nakatsuka et al[8]	65	F	Right side of uterine	MRI show a cystic with high intensity on the T2-weighted image
Hanaoka et al[10]	36	M	Right retroperitoneum	CT show a tumor without marked contrast enhancement, MRI show the tumor with low intensity on the T1-weighted image and high intensity on the T2-weighted image
Amati et al[20]	20	F	retroperitoneum	CT show a low density mass with regular borders and contrast-enhanced septation
Chen et al[9]	46	F	Near renal pelvis	CT show an ill-defined soft tissue mass with unevenly enhanced and with calcified margins. MRI show significant and continuous uneven mass, limited diffusion weighted imaging (DWI), and high signal intensity on apparent diffusion coefficient (ADC) map
Laih et al[3]	57	F	Right retroperitoneum	Ultrasonography show a heterogeneous hypoechoic lesion, and CT show heterogeneous enhancement over the right retroperitoneum

CT: Computed tomography; MRI: Magnetic resonance imaging; NM: Not mentioned; F: Female; M: Male.