title: [Pilomatricoma: a retrospective study of 399 cases].
abstract: OBJECTIVE
  To study the clinical and pathological features of pilomatricoma.
  
  
  METHODS
  The authors retrospectively investigated the clinical and pathological materials of 399 patients with pilomatricoma.
  
  
  RESULTS
  Single lesion occurred in most patients (99%) and 56.39% of them were younger than 30 years. The male-female ratio was 1:1.33. The lesions which sizes average 1.22 cm were commonly emerged in the head, neck, and upper extremity.
  
  
  CONCLUSIONS
  Pilomatricoma is a slowly developed benign cutaneous tumour, but it can aggravate sometimes. It's manifestation is diversed and easily misdiagnosed. Early complete excision is recommended for hard or tenacious nodules on head, neck and upper extremity.
authors.forename: Yongwei
authors.initials: Y
authors.lastname: Guo
authors.forename: Xia
authors.initials: X
authors.lastname: Zhao
authors.forename: Zhongwen
authors.initials: Z
authors.lastname: Zhou
authors.forename: Zhongchun
authors.initials: Z
authors.lastname: Chen
authors.forename: Songmin
authors.initials: S
authors.lastname: Liang
mesh_terms: D000328:Adult; D005121:Extremities; D005260:Female; D006201:Hair Diseases / Q000473:pathology* / Q000601:surgery; D006258:Head and Neck Neoplasms / Q000473:pathology / Q000601:surgery; D006801:Humans; D008297:Male; D008875:Middle Aged; D018296:Pilomatrixoma / Q000473:pathology* / Q000601:surgery; D012189:Retrospective Studies; D012878:Skin Neoplasms / Q000473:pathology* / Q000601:surgery; D047368:Tumor Burden