In the routine examination of hairs taken from certain inflammatory lesions of the scalp one occasionally finds a root which exhibits unusual changes. The lower portion of the root is degenerated and distorted while the upper portion seems to be wrapped around with threadlike filaments. These filaments often overlap and are twisted in various ways, but they always tend to wind around a core, the hair root. These abnormal hairs can be found quite consistently in patients with neurodermatitis affecting the suboccipital area of the scalp. At first glance one may think that an unusual trichophyton ectothrix is present, but after repeated failures in attempted cultivation one is forced to conclude that the appearance is due not to a parasite but to a dystrophic change in the tissues themselves. Writers of standard textbooks on growth and disease of the hair, including Jackson and McMurtry,1 Hubbard,2 Hildebrandt,3 Cottle,
KNOWLES FC, DECKER HB, RADASCH HE, CORSON EF. PSEUDO-ECTOTHRIX: FILAMENTOUS CHANGE NOTED ON THE HAIR ROOT IN CERTAIN INFLAMMATIONS OF THE SCALP. Arch Derm Syphilol. 1935;31(1):38–47. doi:10.1001/archderm.1935.01460190041006
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