Tumours of the Nail Apparatus and Adjacent Tissues

Fungal melanonychia

“…By contrast 1% to 3% of melanomas in Caucasians involve the nail apparatus. 66 Hutchinson sign, or periungual spread of pigmentation to the proximal or lateral nailfolds, is an important clinical sign of subungual melanoma (Fig 10). This should be differentiated from pseudoHutchinson sign, a benign pigmented streak visible through a thin proximal nailfold (Fig 11).…”

Sonography of the Nail

“…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.…”

Frictional Pyogenic Granuloma of the Nail Bed

“…A pyogenic granuloma arising from the nail bed has been described after a penetrating wound of the nail plate [12]. In our cases, the condition arose rapidly after a frictional onycholysis subsequent to prolonged walking.…”