08 July 2026
: Case report 
Misdiagnosis of Endometrioid Borderline Ovarian Tumors by Intraoperative Frozen Section Pathology: A Case Report and Review of the Literature
Challenging differential diagnosis, Unusual or unexpected effect of treatment, Diagnostic / therapeutic accidents, Unexpected drug reaction, Rare disease, Educational Purpose (only if useful for a systematic review or synthesis)
Huifen Wang AB 1, Hongqin Du A 1*DOI: 10.12659/AJCR.952134
Am J Case Rep 2026; 27:e952134
Table 1 Immunohistochemical staining results of the bilateral endometrioid borderline ovarian tumor case.
| Antibody/marker | Result | Notes |
|---|---|---|
| PAX-8 | Negative | |
| Vimentin | Negative | |
| WT-1 | Negative | |
| p16 | Negative | |
| p53 | Negative | |
| ER | Positive | |
| PR | Positive | |
| MLH1 | Positive | |
| MSH2 | Positive | |
| MSH6 | Positive | |
| PMS2 | Positive | |
| CA125 | Positive | |
| Ki-67 | Positive | Approximately 10–20% |
| Abbreviations: CA, cancer antigen; ER, estrogen receptor; PR, progesterone receptor; WT-1, Wilms tumor 1; MLH, MutL homolog; p16, tumor protein 16; p53, tumor protein 53; PMS2, postmeiotic segregation increased 2; PAX-8, paired box gene 8. | ||