Hair Shaft Dysplasias

The 1988 document describes hair shaft dysplasias as structural abnormalities of the hair that can be congenital, hereditary, or acquired, and may indicate underlying diseases. It categorizes these dysplasias into those with increased fragility, such as monilethrix and trichorrhexis nodosa, and those without, like pili annulati and woolly hair. The document details various dysplasias, their clinical presentations, genetic transmission, and associated conditions. It highlights the importance of distinguishing these dysplasias from hair damage caused by external factors and acknowledges the lack of effective treatments, recommending the avoidance of physical and chemical trauma. Some conditions may improve with time or therapies like biotin or zinc. The document also includes a list of references on hair disorders and briefly mentions Brazilian Purpuric Fever, unrelated to hair disorders.