Metastasizing chondroblastoma: a rare bone tumor no longer supported by the WHO classification.

Baumhoer, Daniel; Harder, Dorothee; Ameline, Baptiste; Dawson, Heather; Kollár, Attila (2021). Metastasizing chondroblastoma: a rare bone tumor no longer supported by the WHO classification. Skeletal radiology, 50(1), pp. 255-260. Springer 10.1007/s00256-020-03525-6

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According to the World Health Organization (WHO) classification, tumors showing hematogenous spread in less than 2% of cases are categorized as "rarely metastasizing" and constitute a group of neoplasms of intermediate malignancy. Since its introduction in 2002, chondroblastoma has been considered one of the prototypic examples of this category of lesions. In the fifth and only recently published edition of the WHO classification of bone and soft tissue tumors, however, chondroblastoma was re-classified from rarely metastasizing to benign due to the rarity of cases with systemic spread. Here, we present a remarkable case of a 54-year-old male who presented with an expansile tumor in his left acromion that was diagnosed as chondroblastoma following biopsy. Three years later a local recurrence was noted during routine follow-up and a bone scan detected hypermetabolic lesions in a rib and the thoracic spine. Over time, he developed multifocal skeletal spread as well as soft tissue and pulmonary metastases, which histologically all revealed conventional chondroblastoma morphology and the highly specific H3-3B point mutation (p.Lys36Met). Thirteen years after initial diagnosis he is currently treated with experimental immunotherapy and shows stable but disseminated disease. Our case highlights that although metastasizing chondroblastoma is rare, potential systemic spread should be kept in mind in patients with chondroblastoma despite the new WHO classification.

Item Type:

Journal Article (Further Contribution)

Division/Institute:

04 Faculty of Medicine > Service Sector > Institute of Pathology
04 Faculty of Medicine > Department of Haematology, Oncology, Infectious Diseases, Laboratory Medicine and Hospital Pharmacy (DOLS) > Clinic of Medical Oncology

UniBE Contributor:

Dawson, Heather and Kollár, Attila

Subjects:

500 Science > 570 Life sciences; biology
600 Technology > 610 Medicine & health

ISSN:

0364-2348

Publisher:

Springer

Language:

English

Submitter:

Rebeka Gerber

Date Deposited:

24 Aug 2020 11:44

Last Modified:

21 Nov 2020 01:32

Publisher DOI:

10.1007/s00256-020-03525-6

PubMed ID:

32594198

Uncontrolled Keywords:

Biologic behavior Intermediate malignancy Metastasizing chondroblastoma WHO classification

BORIS DOI:

10.7892/boris.146000

URI:

https://boris.unibe.ch/id/eprint/146000

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