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- Fast-Flow Vascular Malformation: One of the main subdivisions included in the Updated version of the classification for vascular malformations. It is differentiated from slow-flow lesions and developmental anomalies of named vessels lesions. Fast-flow vascular malformations can be subdivided into isolated, multifocal and syndromic lesions. The main change was to use flow velocity as a determinant between lesions with arterial components (fast- flow) and lesions with slow-flow components such as venous, lymphatic and capillary.
- Fibroadipose Vascular Anomaly (FAVA): A vascular malformation generally caused by somatic mosaic variants of PIK3CA. It is characterized by a mix of malformed venous and lymphatic elements together with fibrofatty infiltration of muscle. Pain and contracture may be observed.
