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The
Norwood male pattern baldness classification system type A variant
Norwood also defined a type A variant from his standard calssification
system. He indicated that this variation in hair loss pattern affected
up to 3% of the men in his studies. It is distinguished by two major
features and two minor features.
The major features are: 1) the anterior border of the hairline
progresses to the rear without leaving an island of hair in the
mid frontal region. 2) There is no simultaneous development of a
bladn area on the vertex. Instead the frontal hair line recession
keeps progessing to the rear of the scalp.
The minor features are; 1) There is a persistent sparse hair scattering
in the area of hair loss. 2) The horseshoe shaped fringe areas of
hair that remain on the side and back of the scalp tend to be wider
and reach higher on the head comapred to Norwood's standard classifiaction.
Are
men with pattern alopecia physically more masculine references
- Norwood
OT. Male pattern baldness: classification and incidence. South
Med J. 1975 Nov;68(11):1359-65.
- Norwood OT. Hair Transplant Surgery. Charles
C Thomas Publishers, Springfield IL, USA, 1973. ISBN 0-398-02892-3
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