“…18.29 , 18.30 , 18.31 , and 18.32 ). Fibrous Tumors This in an heterogeneous group with several histological subtypes and forms of presentation that include congenital entities such Koenen's fi bromas (associated with tuberous sclerosis) and acquired fi brous tumors, such as garlic clove-shaped fi bromas [ 62,63 ] . On ultrasound, the heterogeneous group of fi brous tumors can appear as oval-, round-, fusiform-, or polypoid-shaped hypoechoic structures; these are commonly eccentric (i.e., away from the central part of the nail bed) within the nail bed; and can affect the matrix region, including matrix wings and periungual region.…”