fibrous corn

fibrous corn

long-standing hyperkeratotic skin lesion formed within skin areas subject to chronic high loading; characterized by fibrosis of underlying soft tissues, and tying down of superficial tissues to deeper structures (see Table 1)
Table 1: Types and presentations of corn (clavus)
Corn typeName (abbreviation)Typical siteLesion characteristics
HardHeloma durum (HD)Over bony prominences and jointsDark yellow; hard central nucleus, overlain by callosity
SoftHeloma molle (HM)At base of interdigital webspace/interdigital aspect of digit, overlying an interpahalangeal jointWhite/yellow macerated hyperkeratosis; shallow, rubbery nucleus
SeedHeloma miliare (HMill)Weight-bearing skin
Areas of dry skin
Isolated or groups of tiny hyperkeratotic lesions with very hard nuclei
FibrousAreas of skin under high load
Long-standing lesions
Long-term fibrosis ties lesion to underlying tissues; difficult to resolve fully
NeurovascularHeloma neurovasculare (HNV)Areas subject to high load and torsionAs HD, plus elements of vascular/nerve tissue within the nucleus; enucleation is usually painful
Durlacher'sLateral nail sulcus of varus fifth and fourth toesLocally painful; can be overlooked as they resemble nail tissue
SubungualSubungual heloma (HSub-ung)Nail bed, below the nail plate, or encroaching under the nail platePain; local dystrophy, onycholysis and yellow discoloration of overlying nail
References in periodicals archive ?
The structural composite is prepared by mixing the fibrous corn component with a polymer matrix, laminating the mixture, and applying heat and pressure.