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Hair, Nails and Mucous Membranes |
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Nail Diseases
Onychomycosis
Psoriasis
Beau's Grooves
Clubbing
Periungual Warts
White banding of nails
Brown banding of nails
Splinter hemorrhages
Candidal Paronychia
Bacterial Paronychia
Koilonychia
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General Points
- Damage to the nail as a result of trauma or disease results in nail dystrophy
- This is defined as the presence of a misshapen or partially destroyed nail plate
- Soft yellow keratin often accumulates between the dystrophic nail plate, resulting in
elevation of the plate
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Fungus and Dermatophytes
Onychomycosis
Onychomycosis
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Onychomycosis
- Fungal infection is an extremely common cause of toenail dystrophy
Great toenail is extremely prone to infection
Infection of fingernails may occur in nails previously traumatized or when nail
involvement is part of tinea mannum
Onycholysis: separation of nail plate from nail bed
Subungual hyperkeratosis: buildup of soft yellow keratin in the space created by the
onycholysis, usually asymptomatic
Most due to Trichophyton rubrum, but in a few cases, Epidermyophyton floccosum
and Trichophyton mentagrophytes may be recovered. Diagnosis can be made by
culture
Treatment is terbenafine or itraconazole orally
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Psoriasis
Psoriasis
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Psoriasis
- Onycholysis, subungual hyperkeratosis, nail pitting, yellowish discoloration
- More serious nail dystrophies are often accompanied by inflammatory, arthritic changes
in the distal interphalangeal joint
- Extremely difficult to treat
Psoriasis
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Psoriasis
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Psoriasis |
Nail pitting of psoriasis
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Beau's Grooves
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Beau's Grooves
- 1 mm wide depression in the nail plate that extends horizontally from one lateral nail
groove to the other
- All nails are simultaneously affected
- Most commonly develop following dramatic illness such as MI and periods of high fever or
malnutrition
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Clubbing
Clubbing
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Clubbing
- Lovibonds angle greater than 180 degrees, most commonly seen with chronic
pulmonary or cardiopulmonary disease but also occurs with some tumors, especially those of
the lung parenchyma
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Periungual Warts
- Often distort the nail plate
- In most instances, the dystrophy is not permanent and the nail plate returns to normal
following therapeutic or spontaneous resolution of the warts
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White banding of nails |
White banding of nails
- Horizontal white banding or opacification occurs in hypoalbuminemia accompanying chronic
hepatic or renal disease
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Brown banding of nails
- Vertical - secondary to nevus or melanoma
- Horizontal - Addison's disease, cancer chemotherapy
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Splinter hemorrhages
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Splinter hemorrhages
- Thin dark red lines 1-3 mm in length, representing small hemorrhages at the junction of
the nail plate and the nail bed. They move out as the nail grows.
- Seen with bacterial endocarditis, trichinosis, but frequently seen in normal individuals
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Paronychias and Candida |
Candidal Paronychia
- Most common cause of paronychial inflammation and swelling of the fingers
- Seen in dishwashers, bartenders and waitresses
- Characterized by lack of pain, lack of warmth, absence of pus, chronicity
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Staphylococcal paronychia
Pseudomonas
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Bacterial Paronychia
- Usually caused by Staphylococcus
- Redness, warmth, swelling and tenderness
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Koilonychia
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Koilonychia
- Spoon-shapd nails may be due to iron deficiency
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