Very rare. Present at birth and seems more common among the small blonde girls. Hair remaining short (< 6 cm) because the anagen phase of their growth  is short: typically, these are children whose hair does not need to be cut. Hair is not fragile and does not fall earlier, but its density is typically decreased in the frontoparietal region. Manual hair removal is painless. There is usually a spontaneous resolution in adolescence.

This usually isolated anomaly is sometimes encountered in trichodental syndrome.

Anesthetic implications:

nothing specific

References : 

• Ales Fernandez M, Camacho Martinez FM.
  Short Anagen Syndrome: a case study.
  J Cosmetics, Dermatol Sc & Applications. 2012; 2:14-15
• Zarbo A, Shwayder T.
  Loose anagen hair syndome.
  J Pediatr 2018 ; 199 : 282-3.

Updated: October 2018