Dermnet Videos
Alopecia Videos
- Alopecia areata – Causes and Associated Conditions
- Alopecia Areata Information
- Alopecia Areata Treatment
- Course of Sudden Hair Loss Telogen Effluvium
- Evaluation and Treatment of Sudden Hairloss Telogen Effluvium
- Female Pattern Baldness and Hair Loss Causes
- Female Pattern Baldness and Hair Loss in Women
- Female Pattern Hair Loss Evaluation and Testing
- Female Pattern Hair Loss Treatment
- Hair loss and Alopecia Introduction
- Hair Loss Due To Hair Pulling – Trichotillomania
- Hair Loss Treatment and Male Pattern Baldness Medicine
- Loose Anagen Hair Syndrome
- Male Patern Baldness Causes and Hair Loss
- Male Pattern Baldness and Hair Loss Information
- Sudden Hair Loss Telogen Effluvium
- Traction Alopecia Hair Loss
- Traction Alopecia Hair Loss Treatment
- Central Centrifugal Cicatricial Alopecia
- Discoid Lupus Erythematosus – Clinical
- Discoid Lupus Erythematosus – Histology
- Discoid Lupus Erythematosus – Treatment
- Follicular Degeneration Syndrome
- Folliculitis Decalvans – Clinical
- Folliculitis Decalvans Treatment
- Hair Loss Alopecia With Scarring Information
- Lichen Planopilaris
- Lichen Planopilaris – Clinical Features
- Lichen Planopilaris Treatment
Video Topics
Loose Anagen Hair Syndrome
Loose anagen hair syndrome (LAHS) is a condition that occurs predominantly in young children with blonde or light brown hair. It is slightly more common in girls. The condition is characterized by the painless extraction of increased numbers of anagen growing hairs on a pull test. The affected child’s hair is often described as not growing and may demonstrate hairs of varying lengths. The condition usually improves with age but may persist into adulthood. Most cases of LAHS occur sporadically, however, it has also shown an autosomal dominant inheritance pattern in some families.
Pathophysiology of LAHS
The affected hairs in LAHS are anagen (growing) hairs that may lack an inner and outer root sheath on a pull test. The anagen bulbs are often dysmorphic and the hairs may demonstrate longitudinal grooves and ruffled cuticles. Poor cohesion of outer root sheath cells has been described in LAHS. The underlying cellular defect or defects allows the easy and painless extraction of these growing anagen hairs from follicular epithelium.