Case report: A mesenchymal chondrosarcoma with alternative HEY1::NCOA2 fusions in the sella turcica.

Autor:	Kishikawa S; Department of Human Pathology, Graduate School of Medicine, Juntendo University, Tokyo, Japan., Kondo A; Department of Neurosurgery, Graduate School of Medicine, Juntendo University, Tokyo, Japan., Yao T; Department of Human Pathology, Graduate School of Medicine, Juntendo University, Tokyo, Japan., Saito T; Department of Human Pathology, Graduate School of Medicine, Juntendo University, Tokyo, Japan.
Jazyk:	angličtina
Zdroj:	Pathology oncology research : POR [Pathol Oncol Res] 2024 Aug 06; Vol. 30, pp. 1611730. Date of Electronic Publication: 2024 Aug 06 (Print Publication: 2024).
DOI:	10.3389/pore.2024.1611730
Abstrakt:	Introduction: Mesenchymal chondrosarcoma (MCS) is a rare subtype of chondrosarcoma that occurs at widespread anatomical locations, such as bone, soft tissue, and intracranial sites. The central nervous system (CNS) is one of the most common origins of extraosseous MCS. However, alternative HEY1::NCOA2 fusions have not been reported in this tumor. Case Report: We report a case of intracranial MCS with HEY1::NCOA2 rearrangement. A 52-year-old woman presented with a 15-mm calcified mass around the sella turcica. She initially underwent transsphenoidal surgery for tumor resection and then additional resections for five local recurrences over 5 years. Histologically, the tumor was composed of small round to spindle-shaped cells admixed with well-differentiated hyaline cartilaginous islands. A hemangiopericytoma-like vascular pattern and small sinusoid-like vessels were also observed. RNA sequencing using RNA extracted from formalin-fixed paraffin-embedded samples from the last operation revealed two alternative variants of the HEY1::NCOA2 fusion: HEY1 (ex4):: NCOA2 (ex13) and HEY1 (ex4):: NCOA2 (ex14). Both variants were confirmed as in-frame fusions using reverse transcription-polymerase chain reaction. Discussion: Cartilaginous components were often not apparent during the recurrences. In addition to the non-typical pathological finding, the correct diagnosis was hampered by the poor RNA quality of the surgical specimens and non-specific STAT6 nuclear staining. Conclusion: This is the first reported case of intracranial MCS with an alternative HEY1::NCOA2 fusion. Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest. (Copyright © 2024 Kishikawa, Kondo, Yao and Saito.)
Databáze:	MEDLINE
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