ONYCHOLOGY II

Question 1

AKA Meissner’s Disease

general term for any infection
of the nail unit by fungal
organisms including
dermatophytes, yeasts and
occasionally non‐dermatophytic
molds

Tinea unguium strictly refers
only to dermatophyte infections
of the nail unit

Answer 1

Onychomycosis

Question 2

Most common clinical
form, 75% of digits

Initiated by microtrauma
and chronic tinea pedis

Dermatophyte infection

Answer 2

Distal Subungual Onychomycosis

Question 3

Rare, less than 2% of
digits

Usually a lessor pedal
digit in elderly male

Often beneath an
overlapping digit

Dermatophyte infection
by Trichophyton
mentagrophytes usually

Increased frequency in
AIDS

Answer 3

White Superficial Onychomycosis

Question 4

Rarest variety of infection, < 1%

Early clinical sign of AIDS
– 80%(54/82 cases) with AIDS had PSO

T. rubrum, Fusarium
species, C. albicans,
and Aspergillus
species

Answer 4

Proximal Subungual

Onychomycosis

Question 5

Involves only the interior of
the nail plate
– Organisms invade the nail
plate directly without resulting nail bed hyperkeratosis,
onycholysis, or nail bed
inflammatory changes.

Discoloration and splitting

Trichophyton soudanense
infection is most strongly
associated

Answer 5

Endonyx Onychomycosis

Question 6

• Total destruction of the nail
– ridged, hyperkeratotic nail

End‐stage of distal lateral
subungual and proximal
subungual onychomycosis

May take 10 to 15 years to
develop

Great toenails and malaligned digits are often affected most

Risk factor for subungual
ulceration, infection and
osteomyelitis

Dermatophyte caused, mold
contaminated

Answer 6

Total Dystrophic

Onychomycosis