We present the case of a 32-year-old man with a diagnosis of type-III osteogenesis imperfecta who developed a telangiectatic osteosarcoma in the proximal right tibia. An above-knee amputation was performed and after one-year follow-up, pulmonary metastatic lesions were detected on the thoracic CT scan. Palliative chemotherapy was proposed and to date the patient is still living and is under medical treatment. The association between osteogenesis imperfecta and osteosarcoma is rare. There are only ten confirmed reports of this unusual situation, but to our knowledge this is the first case reported with a telangiectatic osteosarcoma arising in this particular setting.

David Gonçalves Ferreira

André Spranger

Paulo Almeida

Dolores Presa

Isabel Fernandes

Joaquim Soares do Brito

Acta reumatológica portuguesa

ACTA REUMATÓLOGICA PORTUGUESA 是一份科学同行评审期刊，涵盖风湿性疾病的各个方面以及与风湿病学相关的内容。该杂志发表原创文章、评论、临床病例、风湿病学图像、致编辑的信和临床教学（例如指南和临床协议）。自 1973 年出版以来，ACTA REUMATOLÓGICA PORTUGUESA 是葡萄牙风湿病学会的官方科学出版物，促进风湿病知识和调查以及风湿病学发展的非营利组织。

Acta Reumatologica Portuguesa is a peer-reviewed scientific journal that covers all aspects of rheumatic diseases and related topics. The journal publishes original research articles, reviews, clinical cases, rheumatology images, letters to the editor, and clinical education materials (such as guidelines and clinical protocols). Since its inception in 1973, Acta Reumatologica Portuguesa has been the official scientific publication of the Portuguese Society of Rheumatology, promoting the dissemination of knowledge and research in rheumatology as a non-profit organization.

《Acta Reumatologica Portuguesa》是一本经过同行评审的科学期刊，涵盖风湿性疾病及其相关领域的各个方面。该期刊发表原创研究文章、评论、临床病例、风湿病学图像、致编辑的信件以及临床教学内容（如指南和临床协议）。自1973年创刊以来，《Acta Reumatologica Portuguesa》一直是葡萄牙风湿病学会的官方科学出版物，致力于促进风湿病知识的传播和研究，以及风湿病学的发展。

Category	Quartile
医学	4
医学, 风湿病学	4

Telangiectatic osteosarcoma arising in osteogenesis imperfecta.

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