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Anais Brasileiros de Dermatologia
Print version ISSN 0365-0596
On-line version ISSN 1806-4841
MULINARI-BRENNER, Fabiane; SOUZA, Fernanda H. Mello de; FILLUS NETO, José and TORRES, Luiz Fernando Bleggi. Quantitative evaluation of transverse scalp sections. An. Bras. Dermatol. [online]. 2006, vol.81, n.3, pp.227-232. ISSN 0365-0596. http://dx.doi.org/10.1590/S0365-05962006000300003.
BACKGROUND - Punch-biopsy is a great tool for the diagnosis of scalp disorders, however experience is required for the dermatopathologist. Recognizing the standard structures found in normal scalp is very helpful in this aspect. OBJECTIVE - The goal of this study was to determine quantitative data considering normal structures on the scalp of white adults. METHODS - Twenty necropsies were followed by eighty 4mm-punch biopsies of clinically normal scalp. Samples were evaluated by transverse sections. RESULTS - Scalp fragments from white adults, age 21 to 78, demonstrated (medians): 16.5 (12.0-23.0) total follicles; 8.0 (6.0-9.0) follicular units; 15.0 (10.0-20.0) terminal follicles; 1.0 (0.0-2.0) vellus follicle; and 1.0 (0.0-2.5) fibrous tract. Considering the hair cycle phase: 92.2% were in anagen; 1.6% in catagen and 6.2% in telogen. CONCLUSION - Comparing the results, male samples demonstrated fewer follicular units, total and telogen follicles, and higher number of total follicles and fibrous tracts on frontal and vertex area.
Keywords : Alopecia; Dermatology; Hair follicle; Histology; Scalp.