PMID- 37323820 OWN - NLM STAT- PubMed-not-MEDLINE LR - 20230619 IS - 1792-1082 (Electronic) IS - 1792-1074 (Print) IS - 1792-1074 (Linking) VI - 26 IP - 1 DP - 2023 Jul TI - Pleomorphic undifferentiated sarcoma of the mediastinal thymus: A case report and literature review. PG - 306 LID - 10.3892/ol.2023.13892 [doi] LID - 306 AB - Pleomorphic undifferentiated sarcoma (PUS) of the mediastinal thymus is a rare type of cancer. In the present case report, a 67-year-old female patient presenting a mediastinal mass for >1 year was assessed for clinical characteristics, histopathological, immunohistochemical expression and gene mutation using fluorescence in situ hybridization (FISH), and relevant literature was reviewed. Histological analysis revealed nodular changes of different sizes in the thymus, which consisted of a mixture of pleomorphic and spindle cells. The pleomorphic cells with distinct atypia were giant cells and multinucleated cells with large cell sizes and frequent nuclear divisions. The spindle cells were mild to moderate atypical and arranged in a woven pattern, and nuclear division was rare. Immunohistochemical analysis indicated that vimentin was diffusively expressed in tumor cells. No amplification was found in CDX2 and MDM4 genes using the FISH analysis. In conclusion, mediastinal thymus neoplasm should be considered in the presence of PUS and it is an exclusionary diagnosis based on clinical and pathological examination of the patient. CI - Copyright: (c) Chen et al. FAU - Chen, Xiaodan AU - Chen X AD - Department of Pathology, The First People's Hospital of Xiaoshan District, Hangzhou, Zhejiang 311200, P.R. China. FAU - Yang, Junjie AU - Yang J AD - Department of Pathology, The First People's Hospital of Xiaoshan District, Hangzhou, Zhejiang 311200, P.R. China. FAU - Huang, Bin AU - Huang B AD - Department of Pathology, The First People's Hospital of Xiaoshan District, Hangzhou, Zhejiang 311200, P.R. China. FAU - Liu, Hongsheng AU - Liu H AD - Department of Pathology, The First People's Hospital of Xiaoshan District, Hangzhou, Zhejiang 311200, P.R. China. FAU - Chen, Lijiang AU - Chen L AD - Department of Pathology, The First People's Hospital of Xiaoshan District, Hangzhou, Zhejiang 311200, P.R. China. LA - eng PT - Case Reports DEP - 20230601 PL - Greece TA - Oncol Lett JT - Oncology letters JID - 101531236 PMC - PMC10265395 OTO - NOTNLM OT - clinicopathology OT - mediastinal thymus OT - pleomorphism OT - undifferentiated sarcoma COIS- The authors declare that they have no competing interests. EDAT- 2023/06/16 06:42 MHDA- 2023/06/16 06:43 PMCR- 2023/06/01 CRDT- 2023/06/16 04:03 PHST- 2023/02/02 00:00 [received] PHST- 2023/05/05 00:00 [accepted] PHST- 2023/06/16 06:43 [medline] PHST- 2023/06/16 06:42 [pubmed] PHST- 2023/06/16 04:03 [entrez] PHST- 2023/06/01 00:00 [pmc-release] AID - OL-26-1-13892 [pii] AID - 10.3892/ol.2023.13892 [doi] PST - epublish SO - Oncol Lett. 2023 Jun 1;26(1):306. doi: 10.3892/ol.2023.13892. eCollection 2023 Jul.