From: Vascular lesions of the head and neck: an update on classification and imaging review
Vascular Malformations | Presentation | MR Imaging Characteristics | Additional helpful imaging characteristics |
---|---|---|---|
Capillary | Cutaneous lesions that often follow a dermal pattern. | Limited utility of imaging. | Â |
Can be used to exclude complicating components not obvious on physical exam. | |||
Additional imaging can be performed if a syndrome is suspected. | |||
Macrocystic Lymphatic | Present at birth or by two years of age. | Complex multiloculated cystic mass with fluid-fluid levels. Cysts typically larger than > 2 cm. Enhancement of the walls and septa on post contrast imaging. | US: large cystic structures without internal vascularity. |
Soft large translucent non tender mass. | |||
Microcystic Lymphatic | Present at birth or by two years of age. Grow slowly in proportion to growing child. | Transpatial T1 hypointense T2 hyperintense lesion with multiple small cysts typically less than 2cm. No enhancement. | Â |
May appear as several small, raised sacs on the skin. | |||
Venous | Most common type of vascular malformation. Slow flow vascular malformation presents as a non pulsatile compressible soft tissue prominence or discrete mass typically with blueish-purple hue. | T2 hyperintense serpiginous tubules that enhance on delayed phase. | CT: serpiginous lesions that enhance on post contrast imaging. More sensitive for phlebolith identification. |
Often tracking along muscle groups or nerves. These are responsive to changes in flow i.e. Valsalva. | T2 hypointense focal phleboliths. | ||
Venolymphatic | Present with characteristics of both lymphatic and venous malformation. | Multiloculated cystic mass with fluid-fluid levels. Some enhancement on delayed phase images. Phleboliths can be present. | CT: serpiginous lesions, some areas can enhance on post contrast imaging. More sensitive for phlebolith identification. |
Classically soft nontender mass can have a blueish-purple hue. | |||
AVM | Can present with CHF, embolism, pain, or bleeding depending on location. | Serpiginous tangle of vessels with enhancement on post contrast imaging and early enhancement of the draining veins. | DSA remains the gold standard. |
High flow vascular malformation can present with pulsating lesion or thrill on examination. May feel warm on palpation. | Serpiginous tangle or mass of vessels with enhancement on post contrast imaging and early enhancement of the enlarged draining veins. | ||
AVF | Symptoms depend on location and what vessels are involved. Can be asymptomatic and incidentally found. | Abnormal connection between an artery and vein, may present as abnormal dilation and fistulous tract on post contrast imaging. | DSA remains the gold standard and demonstrates direct communication of an artery with an abnormal early filling draining vein. |
Increased collateralization commonly seen. | Best seen on MRA which demonstrates abnormal early venous enhancement. |