Eccrine Duct Dilation as a Marker of Cicatricial Alopecia.
BACKGROUND
Eccrine duct dilation (EDD) and syringoma-like sweat duct proliferation have been described as reactive changes occurring in a variety of skin conditions. However, extensive evaluation of EDD in scalp biopsies performed for alopecia has not been performed.


METHODS
We retrospectively examined 129 cases of cicatricial alopecia (lichen planopilaris, central centrifugal cicatricial alopecia, and discoid lupus erythematosus) and 130 cases of noncicatricial alopecias (androgenetic alopecia, telogen effluvium, and alopecia areata) for the presence of EDD.


RESULTS
Overall, EDD occurred in 4% (5/130) of noncicatricial alopecia (2/43 of androgenetic alopecia, 0/15 of telogen effluvium, 3/72 of alopecia areata) and 35% (45/129) of cicatricial alopecia (10/31 of lichen planopilaris, 17/36 central centrifugal cicatricial alopecia, and 18/62 of discoid lupus erythematosus; P < 0.0001) cases.


CONCLUSIONS
EDD can infrequently occur in noncicatricial alopecias; however, the frequency of dilation is significantly increased in cicatricial alopecias. This alteration may be due to compressive or inflammatory effects inherent to the scarring process. The presence of EDD may be a useful adjunctive histopathologic feature in the diagnosis of cicatricial alopecias.
Departments of *Pathology, and †Dermatology, Feinberg School of Medicine, Northwestern University, Chicago, IL; and ‡Robert H. Lurie Cancer Center, Feinberg School of Medicine, Northwestern University, Chicago, IL.
Timothy
T
Tan
Joan
J
Guitart
Pedram
P
Gerami
Pedram
P
Yazdan
D000505:Alopecia / Q000473:pathology*; D004106:Dilatation; D004439:Eccrine Glands / Q000473:pathology*; D006801:Humans