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Acinic cell Carcinoma with high-grade Squamoglandular and Chondrosarcomatous Transformation Mimicking ‘Carcinosarcoma ex-pleomorphic Adenoma’: A Wrinkle in the Proposed Nomenclature Revision for Sarcomatoid Salivary Gland Neoplasms

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Abstract

While acinic cell carcinoma (AciCC) can undergo high-grade transformation (HGT) to high-grade adenocarcinoma or poorly differentiated carcinoma, other morphologies such as spindle cell/sarcomatoid carcinoma are rare and not well-characterized. We herein report a novel case of AciCC with squamoglandular and chondrosarcomatous HGT mimicking a so-called ‘carcinosarcoma ex-pleomorphic adenoma’. The patient is an 81-year-old male with a two-month history of neck swelling and referred otalgia who presented with a left parapharyngeal space mass extending into retropharyngeal space and pterygoid muscles. On resection, the tumor showed considerable morphologic diversity with high-grade serous and mucous acinar components as well as cribriform to solid apocrine-like components with comedonecrosis and squamous differentiation, all of which were embedded in a chondromyxoid background ranging from paucicellular and bland to a high-grade chondrosarcoma/pleomorphic sarcoma-like appearance. Only a minor conventional AciCC component was noted. Immunostains were negative for AR and only focally positive for GCDFP-15 arguing against a true apocrine phenotype, while PLAG1 and HMGA2 were negative arguing against an antecedent pleomorphic adenoma. On the other hand, SOX-10, DOG-1 and PAS after diastase highlighted serous acinar differentiation, and mucicarmine, and NKX3.1 highlighted mucous acinar differentiation. NR4A3 immunohistochemical staining and NR4A3 fluorescence in situ hybridization were positive in the carcinomatous and sarcomatoid components while sequencing analysis of both components revealed identical alterations involving TP53, PIK3CB, ARID1A, and STK11. This unique case warrants caution in designating all salivary sarcomatoid carcinomas with heterologous elements as part of the ‘carcinoma ex-pleomorphic adenoma’ family.

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Conceptualization: R.R., R.R.S.; Methodology: R.R., B.B., S.I.C., R.R.S.; Molecular analysis and investigation: S.I.C., R.R.S.; Writing – original draft preparation: R.R., B.B.; Writing – review and editing: S.I.C., R.R.S.; Funding acquisition: N/A; Supervision: R.R.S.

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Correspondence to Rayan Rammal.

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Rammal, R., Batson, B., Spector, M.E. et al. Acinic cell Carcinoma with high-grade Squamoglandular and Chondrosarcomatous Transformation Mimicking ‘Carcinosarcoma ex-pleomorphic Adenoma’: A Wrinkle in the Proposed Nomenclature Revision for Sarcomatoid Salivary Gland Neoplasms. Head and Neck Pathol 18, 44 (2024). https://doi.org/10.1007/s12105-024-01650-5

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