Gyn Flashcards

Question

5 VAGINAL CYSTS

Answer 1

VAGINAL CYSTS 1. Mullerian: endocervical type 2. EIC: squamous epithelium (prior surgery) 3. Mesonephric / Gartner’s cyst: non mucinous cuboidal epithelial cells (lateral walls) 4. Endometriotic cysts 5. Bartholin cysts

Answer 2

GARTNERS DUCT * Cysts * Mesonephric duct remnants • * Lateral vaginal wall

Answer 3

VAGINAL ADENOSIS * Young women with DES exposure in utero * Upper 1/3 and anterior wall of vagina * 20% have gross congenital malformation of cervix * Benign glandular epithelium with metaplasia * Vaginal clear cell carcinoma

Answer 4

CLEAR CELL ADENOCA VAGINA * DES treatment of threatened and repeated abortions * 2/3 patients with this tumor under age of 40 – linked to DES exposure * 2/3 vaginal, 1/3 cervical * 25% recurrence * Favorable prognosis: low stage, low mitotic activity, mild nuclear atypia

Answer 5

Fibroepithelial stromal polyp * Squamous epithelium * Myxoid stroma * Bizarre stromal nuclei * Mitoses

Answer 6

EMBRYONAL RHABDOMYOSARCOMA * Aka Sarcoma botryoides * Most common malignant vaginal tumor in children * 3 yr * Rare after 5 yr age * Grape-like (botryoid) appearance

Answer 7

Müllerian Adenosarcoma * benign glands cuffed by malignant stroma * may look like phyllodes tumor * mostly 50's + * predominately polypoid growths that fill the entire uterine cavity * +/- deeply invasive * can undergo sarcomatous overgrowth * higher histologic grade * aggressive with metastatic potential * less aggressive than MMMT

Answer 8

Endometrioid Adenocarcinoma of the Ovary * Endometrioid adenocarcinoma is one of the most common subtypes of epithelial ovarian carcinoma. It is recognized histologically by glands or tubules that are lined by stratified columnar cells. Luminal mucin is present, whereas cytoplasmic mucin is commonly absent. It is histologically similar to its counterpart in the uterine corpus. * Cases may or may not be associated with endometriosis. However, in cases in which endometriosis is an associated risk factor, patients present 5 to 10 years earlier than patients without concurrent endometriosis. * In one study, interleukin-1 receptor II was identified both in the cells of endometriosis and in ovarian endometrioid adenocarcinoma, which may provide a link between the two entities. * More recent immunohistochemical and molecular studies have separated ovarian epithelial tumors into two groups: type I tumors, which are of lower histologic grade (e.g., low-grade endometrioid adenocarcinomas), and type II tumors, which are of higher histologic grade (e.g., high-grade endometrioid adenocarcinomas). Type II tumors often harbor p53 mutations not identified in type I tumors and have a much more aggressive course. * A frequent mimic of ovarian endometrioid adenocarcinoma is metastatic colon adenocarcinoma. However, a carefully selected immunohistochemical panel can aid in differentiation. Ovarian endometrioid adenocarcinoma is positive for cytokeratin 7 and CA 125 in most cases; this panel is negative in colon adenocarcinoma. Colon adenocarcinoma is strongly positive for cytokeratin 20 and CDX-2 in most cases; this panel is negative in endometrioid adenocarcinoma. * A morphologic mimic of microglandular ovarian endometrioid adenocarcinoma is the microfollicular variant of adult granulosa cell tumor. The inhibin positivity identified in adult granulosa cell tumor is not seen in ovarian endometrioid adenocarcinoma.

Answer 9

Carcinosarcoma (Malignant Mixed Müllerian Tumor) * Endometrial biopsy specimens can present a difficult diagnostic challenge in the diagnosis of mixed tumor types depending on what has been sampled by the clinician. Sometimes the carcinoma might be the only area sampled. In other scenarios, only sarcomatous elements may be sampled. It is necessary to submit and examine all biopsy material fully to have the best opportunity to make the correct diagnosis; in some cases, this will be impossible because of sampling error. * Mixed müllerian neoplasms are composed of neoplastic epithelium and neoplastic mesenchymal elements. Tumors in this family are represented by benign and malignant components. Carcinosarcomas are composed of both malignant epithelium and malignant mesenchyme. * Carcinosarcomas are composed of obvious carcinoma, which may be squamous, endometrial, mucinous, serous, clear cell, or undifferentiated, with a sarcomatous component that may be homologous or heterologous. When undifferentiated elements are present, it can be difficult to tell whether the undifferentiated areas are carcinoma or sarcoma. Keratin stains are often not helpful because they can stain the sarcomatous elements as well as the carcinomatous elements. These undifferentiated elements have led some experts to consider these tumors as metaplastic carcinomas. * Although tumors were separated into heterologous and homologous carcinosarcomas in the past, there are few data to suggest this distinction is useful. * Although features of the stromal component of the tumors, including mitotic index, presence and type of heterologous elements, and grade, have no predictive value of the presence of metastasis on presentation, high-grade, serous, and clear cell carcinoma histology can be predictive of the presence of metastasis on presentation.

Answer 10

Pap test in pregnancy * a shift towards lower maturation (atrophic) suggests progesterone deficiency and may indicate intrauterine fetal demise or infection * corpus luteum of pregnancy and the placenta produce progesterone, resulting in a predominance of intermediate squamous cells * Cytolysis may be marked due to lactobacilli * “Navicular” cells are boat-shaped intermediate cells containing abundant glycogen. This is not a specific finding in pregnancy. Navicular cells also may be seen during administration of progesterone or androgen-containing hormones. * Postpartum smears show a predominantly atrophic pattern in approximately one-third of nonlactating and two-thirds of lactating mothers.

Answer 11

Embryonal Carcinoma of the Ovary * Embryonal carcinomas are composed histologically of disorganized sheets of large primitive cells that may form papillae. The nuclei often contain large, prominent nucleoli. Mitotic activity is brisk, and necrosis is commonly seen. * Embryonal carcinoma as a pure ovarian neoplasm is rare. It is more commonly seen as a component of mixed germ cell tumor. * OCT 4 is a transcription factor that regulates and maintains pluripotency in embryonic germ and stem cells. It is highly sensitive and specific for embryonal carcinoma as well as dysgerminoma/seminoma. It has a nuclear immunohistochemical staining pattern. * CD30 staining is common in embryonal carcinoma, although it should not be used as the sole diagnostic marker. It has a membranous staining pattern. * Most embryonal carcinomas demonstrate positivity for CD30, OCT 4, cytokeratin AE1/AE3, and AFP. CD117, epithelial membrane antigen (EMA), and CD45 are consistently negative.

Answer 12

Breast Cancer—Her2/neu * Amplification of the HER2/Neu (ERBB2) gene, with associated HER2 protein overexpression and constitutive activation of its tyrosine kinase activity, is more frequent in ER/PR-negative breast cancers and is an independent indicator of poor prognosis. * More importantly, ERBB2 is a target of, and ERBB2 amplification is a marker of, sensitivity to treatment with trastuzumab (Herceptin). In addition, the small tyrosine kinase inhibitor (TKI) lapatinib, and the new anti-HER2 antibody, pertuzumab, which targets a different HER2 epitope, have been shown to be effective in HER2 amplified breast cancer. The latter has been shown to improve progression-free survival rate by almost 50% in patients with advanced breast cancer, when added to docetaxel and trastuzumab. * Although semiquantitative immunohistochemical tests for protein expression, such as Herceptest, are convenient, variability of antigen preservation and retrieval, as well as interobserver variability in interpretation, make immunohistochemistry a less reliable predictor of response than FISH. The American Society of Clinical Oncology and College of American Pathologists have issued guidelines for evaluating the HER2 status of breast tumors. * Resistance to trastuzumab is poorly understood, and many mechanisms may be involved, including loss of the ERBB2 external domain, overexpression of MUC4, increased transcription of ERBB2, and bypassing EGFR signaling by activation of downstream pathways, especially the PI3-kinase/mTOR pathway, including activating PIK3CA mutations and loss of PTEN. * One means of overcoming resistance is treatment with mTOR pathway inhibitors, such as everolimus. Although modest responses have been shown in pretreated patients, clinical trials to evaluate the drug in combination with chemotherapy and trastuzumab are underway. * Trastuzumab has also been shown to be active in HER2 amplified/overexpressing adenocarcinoma of the stomach and distal esophagus. The criteria for immunohistochemical and FISH evaluation from the ToGA trial that showed this benefit differed from the CAP/ASCO criteria, although a recent publication from Memorial Sloan Kettering shows that the CAP/ASCO criteria may be adequate.

Answer 13

GRANULOSA CELL TUMOR * Inhibin * Calretinin * Vimentin * WT1 * CD 99 * S100 * CD56 * SF1 (steroidogenic factor) * FOXL2 gene abnormality on xsome 3

Gyn Flashcards

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