PMC5871373_01
Well-delimited hair rarefaction area on the scalp, "broom fibers"
displaying a tonsure pattern, politrychia, and moderate perifollicular
scaling
abd-93-01-0108-g01.jpg
PMC5871373_01_abd-93-01-0108-g01.jpg
f1
Dermoscopy: erythema, perifollicular desquamation, and tonsure
pattern
abd-93-01-0108-g02.jpg
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Dermoscopy revealed erythema and desquamation, mainly perifollicular, as well as tonsure hair pattern in the proximal or distal parts of the shafts in both plaques (Figure 2).
Hamburger sign: hyperkeratosis with hairs split into two segments by a
layer of red blood cells (Hematoxylin & eosin, X40)
abd-93-01-0108-g03.jpg
PMC5871373_01_abd-93-01-0108-g03.jpg
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The examination also revealed, in the infundibular ostium, hyperkeratosis with hairs split into two segments by a layer of red blood cells, as well as jagged acanthotic projections emerging from the outer root sheath (Figures 3 to 6).
Hamburger sign and gear wheel sign (Hematoxylin & eosin, X40)
abd-93-01-0108-g06.jpg
PMC5871373_01_abd-93-01-0108-g06.jpg
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The examination also revealed, in the infundibular ostium, hyperkeratosis with hairs split into two segments by a layer of red blood cells, as well as jagged acanthotic projections emerging from the outer root sheath (Figures 3 to 6).
Hamburger sign at a higher magnification (Hematoxylin & eosin, X400)
abd-93-01-0108-g04.jpg
PMC5871373_01_abd-93-01-0108-g04.jpg
f4
The examination also revealed, in the infundibular ostium, hyperkeratosis with hairs split into two segments by a layer of red blood cells, as well as jagged acanthotic projections emerging from the outer root sheath (Figures 3 to 6).
Gear wheel sign: outer root sheath forms acanthotic jagged projections
(Hematoxylin & eosin, X40)
abd-93-01-0108-g05.jpg
PMC5871373_01_abd-93-01-0108-g05.jpg
f5
The examination also revealed, in the infundibular ostium, hyperkeratosis with hairs split into two segments by a layer of red blood cells, as well as jagged acanthotic projections emerging from the outer root sheath (Figures 3 to 6).