الفهرس 
Pattern Hair LossOnly 14 pages are availabe for public view
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Abstract
Pattern hair loss primarily affects the top and front of the scalp. In male-pattern hair loss (MPHL), the hair loss often presents itself as either a receding hairline, loss of hair on the crown (vertex) of the scalp or a combination of both. Male pattern hair loss is principally due to the effect of androgens, the most potent of which being dihydrotestosterone, on scalp hair follicles in genetically susceptible individuals. Female-pattern hair loss (FPHL) typically presents as a thinning of the hair. and remains unclear.
Classic male-pattern hair loss begins above the temples and vertex of the scalp. As it progresses, a rim of hair at the sides and rear of the head remains. This has been referred to as a ’Hippocratic wreath’, and rarely progresses to complete baldness. Pattern hair loss is classified as a form of non-scarring hair loss.
Female-pattern hair loss more often causes diffuse thinning without hairline recession.Similar to its male counterpart, female androgenic alopecia rarely leads to total hair loss. The Ludwig scale grades severity of female-pattern hair loss. These include Grades 1, 2, 3 of balding in women based on their scalp showing in the front due to thinning of hair. The Hamilton–Norwood scale has been developed to grade androgenic alopecia in males by severity.
The diagnosis of androgenic alopecia can be usually established based on clinical presentation in men. In women, the diagnosis usually requires more complex diagnostic evaluation. Further evaluation of the differential requires exclusion of other causes of hair loss, and assessing for the typical progressive hair loss pattern of androgenic alopecia