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Carlos Garcia, MD; Eduardo Poletti, MD

	Since this article does not have an abstract, we have provided the first 150 words of the full text and any section headings.

Evaluation of hair loss continues to be a challenge for dermatologists and pathologists. Current trend favors the examination of both vertical and transverse sections of scalp biopsy specimens, although it is not clear if this is owing to opinion or evidence. Proponents of transverse sections claim that this approach is better because one can (1) examine more follicles at various levels; (2) determine the total number of terminal follicles; and (3) better appreciate infiltrates. In contrast, those who prefer vertical sections indicate that (1) any structure of the follicle examined with transverse sections can be seen with vertical sections; (2) very few follicles are needed to make the correct diagnosis; (3) the total number of terminal follicles is the least important criterion; and (4) infiltrates can be adequately assessed by pattern recognition.

To gather our own experience we performed a prospective study of 276 . . . [Full Text of this Article]

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