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This case series describes seven distinct hair shaft disorders, highlighting the importance of accurate diagnosis since these conditions are often treated incorrectly as alopecias without improvement.

This study compared trichostasis spinulosa with keratosis pilaris and eruptive vellus hair cysts, finding differences in lesion distribution and microscopic appearance.

This study observed that ultrastructural changes like lamellar bodies and electron-dense granules in the stratum corneum may aid in the early diagnosis of Netherton syndrome.

Hair fibers break by cuticle cell slipping, shape changing, cuticle fraying, and surface cracking when stretched under specific conditions.

This paper reviews different types of hair shaft dysplasias and does not report any new clinical findings.

This study found that mesenchymal cell processes from the dermal papilla contact epithelial hair matrix cells through gaps in the basal lamina during hair matrix cell differentiation in mouse vibrissa follicles.

This study examined patients with trichostasis spinulosa and identified distinct differences in the distribution and microscopic appearances of lesions compared to keratosis pilaris and eruptive vellus hair cysts.

This study found that straight crimp mutant wool differs from crimpy wool in the layout of cortical cells and the relative proportions of keratin and keratin-associated proteins.

Frequent hairdryer use may worsen hair fragility in people with Pili Annulati.

This study found that scalp involvement in dermatomyositis consistently shows a nonscarring pattern with chronic telogen effluvium, featuring telangiectasia and mucin deposition as universal histologic markers.

This case study reports that selenium shampoo, bacterial infection with trichomycosis axillaris, and possibly strongyloides larvae may have contributed to acquired hair shaft abnormalities resembling trichorrhexis nodosa in two patients.

This study suggests that eruptive vellus hair cysts often have atypical pathological changes and likely originate from the infrainfundibulum and sebaceous duct based on keratin expression analysis.

This article discusses the complexities in diagnosing hair shaft disorders and the potential insights hair microscopy can provide, without reporting new clinical findings.

This study reports that flaky skin mice exhibit skin and nail features that closely resemble human psoriasis vulgaris, suggesting they may serve as a natural model for this condition.

Hair shaft disorders often indicate genetic or systemic issues and are managed by minimizing damage.

This case report details atrichia with papular lesions in a 4-year-old girl, highlighting specific histological findings on her scalp and other affected areas.

Tiger tail banding and hair abnormalities are reliable indicators for diagnosing trichothiodystrophy.

This study found that hair coloring, waving, and ironing were associated with increased hair abnormalities compared to untreated hair in Iranian women.

Lustre mutant sheep have normal hair structure and proteins but differ in felting properties.

This study found that ossification in trichilemmal cysts may be more common than previously thought, often associated with cyst wall rupture, and reports a novel case of ossifying TC with extramedullary hematopoiesis.

This study reports that structural abnormalities in the inner root sheath of hair follicles may cause the hair shaft to be loosely attached in patients with loose anagen hair syndrome.

This study reported that defects in the hair cuticle were found in every case of major structural hair abnormalities examined.

This study investigated the histopathology of ectodermal dysplasia/skin fragility syndrome, identifying specific skin and hair abnormalities associated with PKP1 gene mutations in two young female patients.

This report identified longitudinal grooves in the hair shafts of four children, diagnosing them with uncombable-hair syndrome.

This case report describes a 7-year-old boy with Netherton's syndrome, highlighting the identification of the tricorrhexis invaginata hair defect using a photographically illustrated scalp biopsy, which had not been visually documented before.

This study found that in Japanese, German, and American females, changes in hair lipid patterns with age may reflect alterations in sebum excretion and affect hair texture.

This study suggests that varying intersheet interactions may explain the differences between the two polymorphic forms of macrofibril assembly in Merino wool and hair.

This case study describes a young girl with sparse, brittle scalp hair and multiple keratotic papules, but no systemic or familial abnormalities were found.