: In the histological assessment of endometrial carcinoma, the presence of squamous differentiation is generally considered inconsistent with a serous histotype. Herein, we report a case of endometrial serous carcinoma with extensive squamous differentiation mimicking squamous cell carcinoma, with literature review. A 67-years-old-woman underwent hysterectomy, bilateral salpingo-oophorectomy, sentinel lymph node resection, omental and peritoneal biopsies, due to a 8 cm endometrial mass. Histologically, the tumor showed squamous carcinoma features with positivity for squamous cell markers (p40, p63, cytokeratin-5/6, cytokeratin-34βE12) and negativity for Müllerian markers (PAX8, estrogen receptor, progesterone receptor). No immunohistochemical/molecular alterations typical of endometrioid carcinoma (i.e., PTEN loss, mismatch repair deficiency, nuclear β-catenin expression, POLE mutation) were observed. P53 showed aberrant pattern and p16 showed basal positivity. The tumor infiltrated the myometrium full-thickness with extensive lymphovascular space invasion. Surprisingly, the sentinel lymph node metastasis showed overt serous carcinoma features. Additional sampling of the endometrial mass revealed a minor. In conclusion, serous carcinoma may show diffuse squamous differentiation. In the case of suspected primary endometrial squamous cell carcinoma, an extensive sampling is warranted.
Endometrial serous carcinoma with extensive squamous differentiation mimicking primary endometrial squamous cell carcinoma: Clinicopathological and molecular analysis of a case with literature review
Inzani, Frediano;
2022-01-01
Abstract
: In the histological assessment of endometrial carcinoma, the presence of squamous differentiation is generally considered inconsistent with a serous histotype. Herein, we report a case of endometrial serous carcinoma with extensive squamous differentiation mimicking squamous cell carcinoma, with literature review. A 67-years-old-woman underwent hysterectomy, bilateral salpingo-oophorectomy, sentinel lymph node resection, omental and peritoneal biopsies, due to a 8 cm endometrial mass. Histologically, the tumor showed squamous carcinoma features with positivity for squamous cell markers (p40, p63, cytokeratin-5/6, cytokeratin-34βE12) and negativity for Müllerian markers (PAX8, estrogen receptor, progesterone receptor). No immunohistochemical/molecular alterations typical of endometrioid carcinoma (i.e., PTEN loss, mismatch repair deficiency, nuclear β-catenin expression, POLE mutation) were observed. P53 showed aberrant pattern and p16 showed basal positivity. The tumor infiltrated the myometrium full-thickness with extensive lymphovascular space invasion. Surprisingly, the sentinel lymph node metastasis showed overt serous carcinoma features. Additional sampling of the endometrial mass revealed a minor. In conclusion, serous carcinoma may show diffuse squamous differentiation. In the case of suspected primary endometrial squamous cell carcinoma, an extensive sampling is warranted.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
