angiolipoma

Toddler with
a right thigh mass. Transverse US of the right thigh (above) shows the lesion to be diffusely hyperechoic and well encapsulated. Axial T1 MRI without contrast of the thigh (middle) shows the well enapsulated lesion in the lateral aspect of the right thigh to be slightly hyperintense to muscle and to contain some small flow voids. The mass is extremely hyperintense to muscle and fat on the axial T2 MRI (below).The diagnosis was angiolipoma.
pediatricimaging.org • CC-by-nc-sa 4.0
Intra-articular
angiolipoma of the knee: a case report. Preoprerative MRI. Magnetic resonance imaging of the right knee showed a 2.5 cm tumor located in the dorsal area of the posterior cruciate ligament (arrow). The tumor exhibited a fluctuating high and low signal intensity with low signal septa around the tumor on T2-weighted images.
bmcsportsscimedrehabil.biomedcentral.com • CC-by-2.0
Imaging
spectrum of abnormal subcutaneous and visceral fat distribution. Angiolipoma in a 29-year-old man on the left upper arm. a T1-weighted image shows a subcutaneous tiny mass with inhomogeneous high to intermediate signal intensity (arrow). b Fat-saturated T2-weighted image shows hyperintense signal with focal fat suppression (arrowhead) in the mass with connection to dilated subcutaneous vein (small arrow)
insightsimaging.springeropen.com • CC-by-4.0
Radiopaedia • CC-by-nc-sa 3.0 • de

Angiolipomas (also sometimes known as haemangiolipomas, vascular lipomas, and fibromyolipomas) are rare soft tissue tumors composed of mature adipocytes and vessels. They can occur essentially anywhere and can be subclassified into infiltrating and non-infiltrating variants .

Please refer to the epidural (spinal) angiolipoma article for a specific discussion. The remainder of this article describes the general features of peripheral angiolipomas.

Epidemiology

Typically occur in young adults, appearing on the forearm (most common location), trunk and upper arm. They are more common in males. The most common presentation is of multiple, small (<2 cm), subcutaneous, tender nodules .

Infiltrating angiolipomas are much rarer than the non-infiltrating variant. They occur in children and adults and have no sex predilection. They most commonly appear in the muscles of the lower extremity, neck, and shoulder, and are usually painless .

Radiographic features

As expected, these masses contain adipose tissue with prominent vascular supply.

Infiltrating angiolipoma is nonencapsulated and can contain phleboliths, heterotopic bone, and calcium salts. There are authors who conclude that it should be classified as an "intramuscular hemangioma" .

Ultrasonography

Appear as well-circumscribed, homogeneous hyperechoic masses .

MRI

Angiolipomas demonstrate signal intensity characteristics of mature adipose tissue. Vascular elements are T1-hypointense and T2 hyperintense and enhance vividly following administration of contrast .

Angiography

Catheter angiography demonstrates prominent coarse neovascularity. During the capillary phase, contrast staining is typically seen .

Treatment and prognosis

Treatment is predominantly surgical, although infiltrating tumors are difficult to completely excise  and, as mentioned above, tend to recur locally.

See also

Siehe auch:
und weiter:
Assoziationen und Differentialdiagnosen zu Angiolipom:
Angiolipom
der Mamma
www.eurorad.org • CC by-nc-sa-4.0
Angiolipom
der Thoraxwand
surgicalcasereports.springeropen.com • CC-by-4.0