title: [Primary cutaneous osteosarcoma].
abstract: BACKGROUND
  Osteosarcoma is a malignant tumor of mesenchymatous origin that chiefly affects the metaphysis of long bones. The extraskeletal form of the disease is rare, and even rarer is a cutaneous site, whether metastatic or primary. Herein, we report a new case of primary cutaneous osteosarcoma.
  
  
  METHODS
  A 54-year-old woman presented a hard subcutaneous nodular tumor on her left arm noted 1 year earlier. The diagnosis of cutaneous osteosarcoma was made on the basis of histological analysis of the lesion, which showed a sarcomatous dermal-hypodermal proliferation secreting osteoid. Clinical and radiological staging ruled out any extra-cutaneous spread, particularly to bone, thus confirming the primary cutaneous nature of the osteosarcoma.
  
  
  CONCLUSIONS
  Primary cutaneous osteosarcoma is a rare tumor, diagnosis of which is normally based on histopathological features.
authors: Service d'anatomopathologie, hôpital La Rabta, Jabbari, Bab Saadoun, 1007 Tunis, Tunisie. amirabenmna@gmail.com
authors: A
authors: A
authors: Ben M'na
authors: I
authors: I
authors: Chelly
authors: A
authors: A
authors: Souissi
authors: H
authors: H
authors: Azzouz
authors: S
authors: S
authors: Haouet
authors: M
authors: M
authors: Mokni
authors: N
authors: N
authors: Kchir
authors: A
authors: A
authors: Ben Osman
mesh_terms: D001132:Arm; D005260:Female; D006801:Humans; D008875:Middle Aged; D009928:Organ Specificity; D012516:Osteosarcoma / Q000175:diagnosis* / Q000473:pathology / Q000601:surgery; D012878:Skin Neoplasms / Q000175:diagnosis* / Q000473:pathology / Q000601:surgery