Adipose tissue
The histopathologic findings in FAVA include dense fibrous tissue, fat, and lymphoplasmacytic aggregates within atrophied skeletal muscle. Adipose tissue within skeletal muscles are associated with large, irregular, and sometimes excessively muscularized venous channels and smaller, clustered channels. Organizing thrombi, lymphatic foci and enlarged nerves encircled by dense fibrous tissue are also frequently noted in FAVA.