Accuracy Of Frozen Section Diagnosis Research Articles

Frozen Section Interpretation of Pancreatic Margins: Subspecialized Gastrointestinal Pathologists Versus General Pathologists.

Intraoperative assessment of pancreatic parenchymal margin during pancreatectomies is challenging and misinterpretation by the pathologist is a cause of incorrect frozen section (FS) diagnosis. Although the current literature supports that pancreatic margin FS diagnosis and its accuracy has no impact on the patient outcome for pancreatic ductal adenocarcinoma (PDAC) patients and reexcision in an attempt to achieve a negative intraoperative pancreatic margin after positive FS is not associated with increased overall survival; still it remains a routine practice in many institutions. To this end, we sought to assess the interobserver variation and accuracy of FS diagnosis between subspecialized gastrointestinal/pancreatobiliary (GI) and general pathologists. Seventy seven consecutive pancreatic parenchymal margin FSs performed on pancreatectomies for PDAC from 2010 to 2013 were retrieved at our institution. These were retrospectively evaluated by 2 GI and 2 general pathologists independently without knowledge of the original FS diagnosis or the final diagnosis. The specificity, sensitivity, positive predictive value, negative predictive value, and accuracy of GI versus general pathologist was 97.8% versus 87.5%, 61.1% versus 66.7%, 78.6% versus 41.4%, 95% versus 95.2%, and 93.5% versus 85.1%, respectively. The interobserver agreement between GI and general pathologists was fair (κ = .337, P < .001). The interobserver agreement between 2 GI pathologists was fair (κ = .373, P = .0005) and between 2 general pathologists was slight (κ = .195, P = .042). Although overall accuracy of subspecialized GI pathologists was higher than that of general pathologists, none had an accuracy of 100%. Our study reaffirms the challenging nature of these FSs.

The Accuracy of Frozen Section Diagnosis of Pulmonary Nodules: Evaluation of Inflation Method during Intraoperative Pathology Consultation with Cryosection

Intraoperative frozen section diagnosis (FSD) is a very important pathologic examination that can determine the extent of the subsequent surgical procedure. However, FSD is especially difficult in small pulmonary nodules due to severe architectural distortion during cryosection. This study was undertaken to determine the accuracy of FSD of pulmonary nodules and to evaluate the inflation method during cryosection. We retrospectively reviewed FSD of 229 consecutive pulmonary nodules and evaluated the diagnostic accuracy and efficacy of inflation method during cryosection. Since August 2006, all frozen sections (165, 72.1%) were made after inflation with optimally diluted embedding medium. The FSD were as follows: nonneoplastic lesions (29, 12.7%), benign neoplasms (28, 12.2%), and malignant neoplasms (172, 75.1%). The proportion of the lesions smaller than 2 cm was 60.3% (138 of 229). The frozen section quality of lung tissue was excellent after inflation with diluted embedding medium. Inflated lung specimens harboring minute lesion displayed distinct gross appearance, which could not be palpated. Histologically, open air spaces and normal parenchymal architectures were well preserved. Minute precancerous foci such as atypical adenomatous hyperplasia and bronchioloalveolar carcinoma could be readily identified. After using inflation method during cryosection, both the sensitivity and specificity reached 100%, and the incidence of intraoperative pathology consultation increased markedly, especially small impalpable lesions. The accuracy of FSD and histologic qualities were excellent by using inflation method, especially in cases of impalpable small precancerous lesions. The pathologist could guide with confidence the surgeon in planning the surgical management.

Timing of Androgen Deprivation Therapy and its Impact on Survival After Radical Prostatectomy: A Matched Cohort Study

We assessed the impact of the timing of androgen deprivation on disease progression after radical prostatectomy for patients with localized prostate cancer. We evaluated all patients who underwent radical prostatectomy between 1990 and 1999. Patients with pathological lymph node negative disease who received androgen deprivation therapy were then separated into 5 groups for analysis based on the time of hormone therapy initiation: 1--adjuvant androgen deprivation, 2--androgen deprivation therapy started at a postoperative prostate specific antigen of 0.4 ng/ml or greater, 3--at prostate specific antigen 1.0 or greater, 4--at prostate specific antigen 2.0 or greater and 5--at systemic progression. The first 4 groups were matched by clinical and pathological features to control groups who did not receive androgen deprivation after surgery using a nested, matched cohort design. Median followup for the entire cohort was 10 years. Clinical end points included systemic progression-free survival and cancer specific survival. After matching clinicopathological variables adjuvant androgen deprivation therapy was associated with improved 10-year systemic progression-free survival (95% vs 90%, p <0.001) and 10-year cancer specific survival (98% vs 95%, p = 0.009), although overall survival for these patients remained unchanged (84% vs 83%, p = 0.427). In contrast, we found that men who started hormonal therapy at a postoperative prostate specific antigen of 0.4 or greater, 1.0 or 2.0 did not have improved systemic progression-free or cancer specific survival. Adjuvant hormonal therapy modestly improves cancer specific survival and systemic progression-free survival after prostatectomy. The benefit of hormone therapy is lost when androgen deprivation is delivered at the time of prostate specific antigen recurrence or systemic progression.

0649: The Accuracy of Frozen Section Diagnosis at Surgery in Pre-Malignant and Malignant Lesions of the Endometrium

0649: The Accuracy of Frozen Section Diagnosis at Surgery in Pre-Malignant and Malignant Lesions of the Endometrium

Accuracy of Frozen Section Diagnosis in Borderline Ovarian Malignancy

This study was conducted to determine the accuracy of frozen section diagnosis in borderline ovarian tumors. Thirty-three patients were evaluated on the basis of frozen sections between February 1992 and December 1997. Frozen section diagnosis and final diagnosis were divided into three categories: for frozen section diagnosis: 1 = benign, 2 = borderline, 3 = ‘at least’ bordeline, and for final diagnosis: 1 = benign, 2 = borderline, 3 = cancer. Three patients with a benign diagnosis according to their frozen sections were reclassified as borderline in the final diagnosis and all of them were of the mucinous type. The frozen section diagnosis of tumors of borderline malignancy was inaccurate in 3 of 23 patients. Four of 7 patients with at least borderline according to their frozen section diagnosis had invasive cancer at the final diagnosis. The correlation between frozen section diagnosis and final pathological examination was 72.7% (24/33). We found 9% (2/22) inaccurate results in the serous type and 36.6% (4/11) in the mucinous type. The sensitivity and specificity of frozen section diagnosis were found to be 86.95 and 57.14%, respectively. We concluded that frozen section evaluation in identifying a borderline ovarian malignancy is accurate enough to exclude the presence of a benign pathology.

THE PERCENT OF CORES POSITIVE FOR CANCER IN PROSTATE NEEDLE BIOPSY SPECIMENS IS STRONGLY PREDICTIVE OF TUMOR STAGE AND VOLUME AT RADICAL PROSTATECTOMY

Pretreatment clinical staging of prostatic adenocarcinoma is important due to the increasing use of nonsurgical treatment options. Using multivariate analysis we assessed the predictive value of biopsy cores positive for cancer as a percent of all cores obtained as well as the percent surface area of needle cores involved with tumor for determining tumor volume and pathological stage at radical prostatectomy. Candidate variables for the multivariate model included patient age, clinical disease stage, serum prostate specific antigen (PSA) and Gleason score of cancer in the needle biopsy. We reviewed prostate needle biopsy findings in 207 consecutive patients who subsequently underwent radical retropubic prostatectomy. Each biopsy specimen was assessed for tumor involvement by calculating the percent of cores positive for cancer, percent surface area involved in all cores and Gleason score. Initial serum PSA and preoperative clinical disease stage were incorporated with biopsy results into a multivariate model to determine the parameters most predictive of pathological stage and tumor volume at radical retropubic prostatectomy. Of the 207 patients 152 (73.4%) had organ confined cancer and 55 (26.6%) had extraprostatic extension (pathological stages T2 and T3 or greater, respectively). Preoperative clinical staging information was available in 195 cases, in which disease was clinically confined and not confined in 184 (94.4%) and 11 (5.6%), respectively. Needle biopsy revealed a surface area of cancer ranging from less than 5% in 69 patients (33.3%) to 90% (mean 16, median 10). Univariate analysis demonstrated that the risk of extraprostatic extension was predicted by preoperative serum PSA (p = 0.027), the percent of cores and percent of surface area positive for cancer (p <0.0001), and Gleason score (p = 0.0009). Clinical stage approached significance (p = 0.071). Multivariate analysis showed that the percent of positive cores (p = 0.0003), initial serum PSA (p = 0.005) and Gleason score of cancer in the needle biopsy (p = 0.03) were the only parameters that jointly predicted pathological stage (T2 versus T3). Percent of tumor surface area involvement in the needle biopsies did not add any more information after the percent of positive cores was known. Univariate analysis revealed that the percent of cores positive for cancer (Spearman r = 0.52, p <0.0001), Gleason score (Spearman r = 0.34, p <0.0001) and initial serum PSA (Spearman r = 0.24, p = 0.003) were predictive of log tumor volume at radical prostatectomy, while clinical stage was not (rank sum test p = 0.14). On multivariate analysis the percent of positive cores (p <0.0001), Gleason score (p <0.0001) and initial serum PSA (0.0033) were the only variables that jointly were predictive of tumor volume. The percent of needle biopsy cores and surface area positive for cancer are the strongest predictors of pathological stage and tumor volume on multivariate analysis incorporating preoperative serum PSA and Gleason score.

The Accuracy of Frozen-Section Diagnosis in Metastatic Breast and Colorectal Carcinoma to the Adnexa

Objective.The objective of our study was to describe the accuracy of intraoperative frozen-section diagnosis of carcinoma metastatic to the adnexa in women with a history of breast or colorectal carcinoma.Methods.We conducted a retrospective chart review of all patients with a history of breast or colorectal carcinoma who developed histologically proven pelvic or abdominal metastases between 1988 and 1995. In those patients whose final histologic review revealed carcinoma metastatic to the adnexa, the accuracy of the intraoperative frozen-section diagnosis of the adnexal tumor was compared to the final diagnosis.Results.Forty-three patients were identified and in 36 patients the frozen section was obtained from the adnexa. Twenty-one patients (58.3%) had metastatic breast carcinoma and 15 (41.7%) had metastatic colorectal carcinoma to the adnexa. Carcinoma in the adnexa was correctly diagnosed by frozen section in 35 of 36 patients (97.2%). Metastatic carcinoma was identified at frozen section in 17 of 21 patients (81%) with metastatic breast cancer and 13 of 15 patients (86.7%) with metastatic colorectal cancer. In 3 of 21 patients (14.3%) with metastatic breast cancer and in 2 of 15 patients (13.3%) with metastatic colorectal cancer, the frozen-section diagnosis was carcinoma of uncertain origin. One patient had a false-negative frozen section because the small focus of metastatic breast cancer was not sampled at the time of frozen section.Conclusion.Intraoperative frozen-section evaluation correctly diagnosed carcinoma in the adnexa in 97% of patients, and in over 80% of cases, the carcinoma was diagnosed as being metastatic in origin.

Squash Preparation and Frozen Section in Intraoperative Diagnosis of Central Nervous System Tumors

To investigate the diagnostic accuracy of squash preparation (smears) and frozen section (FS) in the rapid intraoperative diagnosis of central nervous system (CNS) tumors. One hundred eighty-three CNS tumors were examined over a period of 18 months (January 1995-June 1996). All these were open biopsies, and the smear interpretation was compared with FS findings and paraffin section diagnosis. In 183 tumors, squash preparation was satisfactory in 156 cases (85.2%), and the diagnostic accuracy was 89.7% (140/156). The accuracy of FS diagnosis was 90.4% (141/156). The squash smear preparation is a fairly accurate and reliable tool in the rapid intraoperative diagnosis of CNS tumors. The accuracy of this technique is nearly as good as that of FS (P value = .9877). With the advent of stereotactic biopsies, the pathologist may have to depend entirely upon cytologic features for a definitive diagnosis.

Accuracy of Frozen Section Diagnosis in Gynecology

Objective.A retrospective study was undertaken to evaluate the accuracy of frozen section diagnosis in gynecological surgery.Methods.We compared the results of 792 consecutive gynecological frozen section diagnoses with their final diagnoses from January 1991 to June 1996. Slides for which the frozen section diagnosis was uncertain or incompatible with the final diagnosis were reviewed by an attending pathologist to determine the possible causes.Results.A total of 299 ovarian, 390 lymph node, 56 uterine lesions, and 77 other tissue samples were obtained. The frozen section diagnosis was compatible with the final diagnosis in 97.5% of cases. The sensitivity for nonbenign lesions was 90.9%, and the specificity was 99.5%. There were no false positives or overestimated cases; 1.3% of cases were falsely negative, 0.4% underestimated the degree of malignancy, and 0.9% were uncertain. Possible causes for incompatible or uncertain frozen section diagnoses were analyzed. The accuracy of frozen section diagnoses for ovarian, lymph node, uterine, and other tissues was also evaluated. Frozen section was found to identify correctly 13 of 17 ovarian malignancies metastaic from other organs, 14 of 15 germ cell malignancies, and 3 of 4 dysgerminomas. The low sensitivity in ovarian borderline malignancy was due to the even lower sensitivity in its mucinous subgroup. The relationship between section numbers and accuracy of frozen section diagnosis in mucinous ovarian tumors was assessed.Conclusion.Frozen section diagnosis in gynecology is sufficiently accurate for clinical use, with a low false negative rate and an even lower false positive rate. Most incompatible frozen section diagnoses occurred in ovarian lesions, especially in mucinous ovarian tumors. Performing multiple sections (at least one section for every 10 cm in diameter) is recommended in the frozen section diagnosis of mucinous ovarian tumors.

The Accuracy of Frozen section Diagnosis of ovarian Tumors

The Accuracy of Frozen section Diagnosis of ovarian Tumors

The Accuracy of Frozen Section Diagnosis of Gynecologic Tumors

The Accuracy of Frozen Section Diagnosis of Gynecologic Tumors

Accuracy of Frozen Section Diagnosis in Surgical Pathology: Review of a 1-Year Experience With 24,880 Cases at Mayo Clinic Rochester

To determine the accuracy of frozen section examination for routine diagnostic use in surgical pathology. We retrospectively reviewed the experience with frozen sections at Mayo Clinic Rochester during calendar year 1993. The results in 24,880 cases (97,914 frozen section slides) processed during 1993 were compared with findings on permanent sections, and types of errors detected were classified into one of three quality assurance categories. The overall rate of frozen section accuracy was 97.8%. Of the 2.2% of surgical pathology reports that needed revision, 1.6% were unavoidable tissue sampling errors, 0.5% were errors that reflected change in degree of abnormality, and only 0.1% were clinically significant errors that may have affected patient management. Frozen section diagnosis is accurate for processing a high volume of surgical pathology cases.

Accuracy of frozen-section diagnosis at surgery in clinical stage I and II endometrial carcinoma

The purpose of our study was to determine if frozen section accurately identifies certain poor prognostic pathologic factors in endometrial carcinoma that are known to be associated with pelvic and paraaortic nodal metastasis, including deep myometrial invasion, poorly differentiated tumor, cervical invasion, adnexal involvement, and poor histologic type. The frozen-section pathologic results of 199 patients with clinical stage I and II endometrial cancer were retrospectively compared with permanent-section pathologic findings. The depth of myometrial invasion (superficial third vs deep two thirds) was accurately determined by frozen-section diagnosis at surgery in 181 of 199 cases (91.0%). The sensitivity of frozen-section diagnosis for deep myometrial invasion was 82.7%, and the specificity was 89.1%. The following tumor characteristics were accurately determined on frozen section at surgery: poorly differentiated tumor (95.0%), cervical invasion (94.0%), adnexal involvement (98.5%), and histologic type (94.0%). Frozen section underestimated deep myometrial invasion in 17.3% of patients with this characteristic and poorly differentiated tumor in 26.3% when compared with permanent-section diagnosis. In patients with unfavorable histologic types, papillary serous and adenosquamous carcinomas were the most commonly misdiagnosed histologic types by frozen section at surgery (70.6%). However, when the preoperative curettage pathologic findings were included, these inaccuracies in tumor grade and histologic type dropped to 15.8% and 35.3%, respectively. Only 13 of 199 patients (6.5%) were not correctly identified by frozen section at surgery as having poor prognostic pathologic features. Frozen section diagnosis at surgery is an important procedure that enables the surgeon to identify patients at high risk for pelvic and paraaortic nodal metastasis.

Accuracy of Frozen Section Diagnosis of the Salivary Gland

Three hundred and one salivary gland lesions (162 benign, 72 malignant, and 67 benign non-neoplastic) of 677 cases were evaluated by use of intraoperative frozen sections by 66 pathologists. In seven patients, the diagnosis was deferred for permanent sections. In four cases (1.3%), the diagnosis at permanent section changed from one category of benign tumor to another, and in five cases (1.7%), from one category of malignant tumor to another. In four tumors, a frozen section diagnosis of benign was changed to malignant on permanent sectioning; all four involved acinic cell carcinomas. Only two tumors were incorrectly diagnosed as malignant. We conclude that diagnoses of most salivary gland lesions based on frozen section examination are reliable and accurate. However, the literature does indicate that caution should be exercised when malignant tumors are dealt with.

Accuracy of Frozen Section Diagnosis in Pelvic Lymph Node Staging Biopsies for Adenocarcinoma of the Prostate

Intraoperative frozen section diagnoses were compared to permanent section results in 42 patients with localized prostatic cancer undergoing staging pelvic lymph node biopsies. A Gleason data analysis was compared to conventional histologic classification. The 7 per cent falsely negative rate found in our series compares favorably to the 11 per cent average rate reported previously.

Accuracy of Frozen Section Diagnosis in Nodular Goiter

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Accuracy of frozen section diagnosis in nodular goiter.

Accuracy of frozen section diagnosis in nodular goiter.