title: Localized pili canaliculi and trianguli.
abstract: A 3-year-old boy presented two patches of light, bright, smooth, uncombable hair that were morphologically different from the rest of the hairs. Examination under scanning electron microscopy showed the morphologic characteristics of pili canaliculi and trianguli. Clinical and ultrastructural features seemed to correspond with a previously undescribed localized form of pili canaliculi et trianguli. Differential diagnosis is discussed.
mesh_terms: D002675:Child, Preschool; D003937:Diagnosis, Differential; D006197:Hair / Q000002:abnormalities* / Q000648:ultrastructure; D006801:Humans; D008297:Male; D008855:Microscopy, Electron, Scanning