Tinea capitis

    Clinical Features:

    • Most common in children
    • May result in adenopathy, alopecia or folliculitis.

    Histologic Features:

    • Fungal hyphae are seen within the stratum corneum, and invade down the hair follicles.
    • Three histologic types exist, depending of the species of dermatophyte: large-spore (5-8 μm) ectothrix, large-spore endothrix and small spore (2-5 μm) ectothrix.
    • Fungi may or may not be visible on H&E, and are best seen with GMS or PAS.
    • Intraepidermal neutrophils may be present.
    • The stratum corneum may show compact orthokeratosis or sometimes the "sandwich sign": ortho- or parakeratosis alternating in layers with the normal basket-weave stratum corneum.
    • Epidermal changes can include spongiosis, intraepidermal vesicles or psoriasiform hyperplasia.
    • Dermal inflammation can vary from none to a diffuse or perivascular infiltrate of lymphocytes, histiocytes, neutrophils and/or eosinophils.
    External Links:

     

    Cases associated with this book:

  • Tinea capitis
    Author: Stephen Lyle, M.D., Ph.D.

    Conference: DermatopathologyConsultations.com Teaching Collection