title: A perplexing malignant bone tumor. Highly malignant so-called adamantinoma or non-typical Ewing's sarcoma.
abstract: A malignant tumor of the second metatarsal in a thirteen-year-old girl with trouble-some clinical and especially light- and electronmicroscopical aspects is described. The findings are discussed in relation to each of the two possibilities to be considered: highly malignant, extra-cranial so-called adamantinoma (poorly differentiated or basaloid type) or Ewing's sarcoma with focal squamous differentiation, the latter being a most remarkable observation.
mesh_terms: D000293:Adolescent; D000367:Age Factors; D000564:Ameloblastoma / Q000473:pathology*; D001706:Biopsy; D001859:Bone Neoplasms / Q000000981:diagnostic imaging / Q000473:pathology*; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D008175:Lung Neoplasms / Q000000981:diagnostic imaging; D008684:Metatarsus / Q000473:pathology; D008854:Microscopy, Electron; D009362:Neoplasm Metastasis; D011859:Radiography; D012512:Sarcoma, Ewing / Q000000981:diagnostic imaging / Q000473:pathology*