Chondroblastoma-like primary malignant giant cell tumor of the humerus – a case report
Authors:
Zdeněk Kinkor 1; Petr Grossmann 1; Zuzana Špůrková 2; Zuzana Věcková 2; Zdeněk Matějovský 3
Authors‘ workplace:
Bioptická laboratoř s. r. o., Šiklův ústav patologie, LF UK, Plzeň
1; Oddělení patologie, Nemocnice na Bulovce, Praha
2; Ortopedická klinika, Nemocnice na Bulovce, Praha
3
Published in:
Čes.-slov. Patol., 55, 2019, No. 1, p. 42-47
Category:
Original Articles
Overview
35-year-old woman suffered prolonged pain in the left shoulder, where an aggressively growing tumor of the proximal humerus was revealed thereafter. The lesion caused massive osteolysis of the metaepiphysis with cortical disruption, but no soft tissue extension was evident. Given the unsatisfactory effect, the ongoing neoadjuvant chemotherapy was prematurely ceased and the resection 13 cm long segment of bone with modular prosthesis replacement followed. Histologically, clear-cut malignant tumor with both the presence of numerous reactive osteoclast-like giant cells and geographic structural deposition of chondroid matrix bore a close resemblance to chondroblastoma. Dominant cellular composition formed solid mosaic clusters of large, atypical, frequently binucleated cells with voluminous eosinophilic cytoplasm. Impressive nuclear pleomorphism was accentuated by both the grooving and atypical mitotic figures. Thorough sampling disclosed limited, but sharply contrasting parts, where biphasic arrangement of small uniform stromal elements together with regularly distributed, reactive osteoclasts suggested putative precursor giant cell lesion. Except the osteoclasts, all matrical and stromal cells were strongly SOX9 and D2-40 positive; in contrary desmin, SATB2, S100 and p63 yielded completely negative results. Detected H3F3A c.103G>T mutation in exon 2 finally established true nature of that peculiar neoplastic proliferation and lead to descriptive term of primary chondroblastoma-like malignant giant cell tumor. In the setting of all the microscopic variability, histogenesis and complex differential diagnosis of skeletal (malignant) giant cell lesions, there are discussed e.g. aggressive/malignant chondroblastoma, chondroblastoma-like osteosarcoma or giant cell-rich osteosarcoma and practical impact of specific mutational analysis results as well.
Keywords:
Humerus – primary malignant giant cell tumor of the bone – chondroblastoma – chondroblastoma-like – H3F3A mutation
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