Non-recurrent Laryngeal Nerve Identified During Robotic Thyroidectomy in a Patient with Papillary Thyroid Carcinoma / 대한내분비외과학회지

A non-recurrent laryngeal nerve is a rare anatomical variant that entails considerable risk for iatrogenic injury during thyroid surgery. We encountered a patient with a non-recurrent laryngeal nerve that went unnoticed on preoperative imaging but was discovered incidentally during robotic thyroidectomy. A 44 year old woman presented at our department with papillary thyroid microcarcinoma, diagnosed by ultrasonography-guided fine needle aspiration cytology. During robotic right thyroidectomy and central lymph node dissection, we could not detect any structure resembling the recurrent laryngeal nerve around the inferior thyroid artery. Thus, we suspected the existence of a non-recurrent laryngeal nerve, and successfully identified a nerve entering the larynx directly from the vagus nerve without recurring. A three-dimensional high magnification view via a robotic endoscope can aid thyroid surgeons to safely identify and preserve a non-recurrent laryngeal nerve.

The Prognostic Significance of the Metastatic Lymph Node Ratio in Patients with Papillary Thyroid Carcinoma / 대한내분비외과학회지

PURPOSE: Metastatic lymph node ratio (MLNR) is known as an important prognostic factor in many solid carcinomas; however, the role of MLNR in papillary thyroid carcinoma (PTC) is unclear. The purpose of this study was to determine whether MLNR has prognostic significance for recurrence in patients with pathological N1a PTC. METHODS: A retrospective analysis was conducted of 1,198 patients with PTC who underwent total thyroidectomy with central neck dissection between 2006 and 2011. Only patients with central lymph node metastasis were included in this study. Patients with lateral neck lymph node metastasis or extrathyroidal involvement were excluded. Finally, this study included 282 patients with N1a patients. MLNR was defined as the number of metastatic lymph nodes divided by the number of removed lymph nodes. RESULTS: Median age was 47.3 years (17~73 years). There were 209 female patients and 41 male patients, respectively. Median follow-up period was 53 months (36~114 months). Median value of MLNR was 0.36 (0.04~1.000). Of 250 patients, 20 patients (8.0%) developed recurrent disease. MLNR independently predicted PTC recurrence (odds ratio [OR], 6.385; 95% confidence interval [CI], 2.523-16.158; P 0.47 should be monitored closely for recurrence.

Clinical Significance of Blood Neutrophil-to-Lymphocyte Ratio in Patients with Papillary Thyroid Carcinoma / 대한내분비외과학회지

PURPOSE: The neutrophil-to-lymphocyte ratio (NLR) is a strong predictor of poor prognosis in patients with various types of cancer. To date, the utility of NLR for prediction of prognosis in thyroid cancer patients has not been studied. Therefore, the aim of our study was to determine whether NLR is associated with other prognostic factors of papillary thyroid carcinoma and predictive of recurrence. METHODS: We conducted a retrospective review of 367 patients who underwent thyroidectomy for papillary thyroid carcinoma from January 2005 to December 2007. We measured the white blood cell count including neutrophil and lymphocyte within one month preoperatively. The NLR was defined as the absolute neutrophil count divided by absolute lymphocyte count. Logistic regression analysis was applied for comparison of NLR with other prognostic factors, including tumor size, lymph node metastasis, multiplicity, extrathyroidal invasion, and TNM stage. We also determined the cut-off value of NLR with a prediction for recurrence. RESULTS: Median age of patients was 47 years (16~86 years) and the rate of papillary thyroid microcarcinoma was 65.7% (241/367 cases). Median follow-up period was 1,841 days (506~3,135 days). The median value of NLR was 1.68 (0.66~6.36). NLR was not related to any other prognostic factors of papillary thyroid carcinoma. The cut-off value of NLR for prediction of recurrence was 1.73, where the sensitivity was 66.7% and specificity was 69.8%. CONCLUSION: Patients with NLR equal to or higher than 1.73 showed significantly higher recurrence of papillary thyroid carcinoma. Further validation study should be conducted for clinical use of NLR as a prognostic marker.

Clinicopathological Relevance between Body Mass Index and Papillary Thyroid Carcinoma / 대한내분비외과학회지

PURPOSE: Obesity is a known risk factor for several cancers, including breast, colon, esophagus, kidney, uterus, and thyroid. Recent studies have reported that higher body mass index (BMI) is also associated with more advanced stage. The aim of this study was to investigate the clinicopathological relevance between BMI and papillary thyroid carcinoma (PTC). METHODS: A total of 798 patients surgically treated for PTC from January 2006 to June 2010 were included in this study. Medical records and pathologic reports were reviewed retrospectively. According to BMI, patients were divided into four groups: underweight (3.1%), normal (57.3%), overweight (31.6%), and obese (8.0%). Clinicopathological factors were analyzed and compared between normal and other groups. RESULTS: According to the results, 709 patients were women (89.0%) and mean age was 48.5 years; mean follow-up period was 1,721+/-464.2 days. In comparison between the normal and underweight groups, there was significantly more extra-thyroidal invasion [Odds ratio (OR) 3.923, P=0.006] in the underweight group. In the obese group, tumor size was significantly larger (OR 1.794, P=0.007). However, there was no significant difference between the normal and overweight group. CONCLUSION: In the obese group, tumor size was the only clinical significant factor between high BMI and PTC. Interestingly, more extra-thyroidal invasion was seen in the underweight group. To confirm this result, further studies with long-term follow-up and more patients are required.

Metastatic Hemangiopericytoma of the Thyroid Gland / 대한갑상선학회지

Hemangiopericytoma (HPC) is a mesenchymal neoplasm constituting a minor portion of vascular tumors. Although HPCs are generally benign, some progress in a malignant course, leading to recurrence and metastasis even after radical surgery. We present a case of metastatic HPC of the thyroid gland, a very rare site of occurrence. Histological findings revealed a single, well-margined mass with high cellularity. Tumor cells were tightly packed spindle-shaped to round cells arranged around numerous thin-walled vessels. Tumor cells showed cytoplasmic immunoreactivity for CD34 and CD99. To our knowledge, this is the eleventh case reported worldwide and the first case in South Korea.

The Predictive Value of Serum Parathyroid Hormone Levels for the Occurrence of Hypocalcemia Following Total Thyroidectomy / 대한내분비외과학회지

PURPOSE: The aim of study was to determine the cut-off value of serum parathyroid hormone levels with a predictive value for the occurrence of clinical hypocalcemia following total thyroidectomy. METHODS: We performed a retrospective review, of 150 patients who underwent total thyroidectomy for papillary thyroid carcinoma from January 2010 to July 2010. We measured the serum levels of parathyroid hormone and phosphate within 18~24 hours postoperatively. The serum levels of ionized calcium were measured immediately and within 18~24 hours postoperatively. We also determined the cut-off value, sensitivity and specificity of serum levels of parathyroid hormone, ionized calcium, and phosphate with a predictive value for the occurrence of clinical hypocalcemia. RESULTS: Serum levels of parathyroid hormone were 2.0±1.7 pg/ml in the clinical hypocalcemia group, 9.9±10.7 pg/ml in the asymptomatic hypocalcemia group, and 15.3±10.7 pg/ml in the normal control group (P<0.001). Serum levels of ionized calcium were also significantly lower in the clinical hypocalcemia group (0.92±0.16 mmol/L) compared with the normal control group (P=0.002). On the other hand, serum levels of phosphate were significantly higher in the clinical hypocalcemia group (P=0.009). The cut-off value of serum parathyroid hormone levels for the prediction of clinical hypocalcemia was 4.5 pg/ml, where the sensitivity, specificity, positive predictive value, and negative predictive value were 87.5%, 63.4%, 89.3% and 59%, respectively. CONCLUSION: Serum parathyroid hormone levels following total thyroidectomy are the most powerful predictive factors for the occurrence of clinical hypocalcemia. Our results show that the incidence of clinical hypocalcemia is relatively higher at postoperative serum levels of parathyroid hormone ≤4.5 pg/ml.

The Clinical Utility of Automated Breast Volume Scanner: A Pilot Study of 139 Cases / 한국유방암학회지

PURPOSE: The aim of this study is to evaluate the clinical utility of automated breast volume scanner (ABVS) for detecting and diagnosing the breast lesions. METHODS: From December 2010 to January 2012, bilateral whole breast examinations were performed with ABVS for 139 women. Based on the Breast Imaging Reporting and Data System (BI-RADS) categories, the breast lesions were evaluated on coronal multiplanar reconstruction images using the ABVS workstation. Then, the imaging results were compared with those on conventional handheld ultrasound (HHUS) images. Histological diagnoses were performed on BI-RADS category 4 and 5 lesions. RESULTS: A total of 453 lesions were detected by ABVS. On the HHUS, 33 new lesions were detected but 69 lesions were not detected. BI-RADS category 2 and 3 matched to those on ABVS at 73.5% (61/83) and 85.4% (276/323). In 47 lesions of BI-RADS category 4 or 5, there was an exact match to those on ABVS. In addition, 47 lesions were classified as BI-RADS category 4 and 5, for which an ultrasound-guided core needle biopsy was performed. The malignant lesions of BI-RADS category 4 and 5 showed the following: 2/27 (7.4%) in 4A, 4/5 (80%) in 4B, 2/2 (100%) in 4C, and 13/13 (100%) in 5. The ABVS showed 21 true positives and a positive predictive value of 44.7% (21/47). CONCLUSION: There was considerable agreement in the assessment of the breast lesions by ABVS and HHUS. The ABVS had advantages of high diagnostic accuracy, examiner-independence, multislice visualization of the whole breast and less time-consuming. Our results indicate that ABVS might be a useful modality in diagnosing breast lesions.

Primary cutaneous malignant melanoma of the breast / 대한외과학회지

Cutaneous malignant melanoma of the breast can be divided into two categories: primary and metastatic lesions. Cutaneous malignant melanoma of the breast is a rare tumor, accounting for less than 5% of all malignant melanomas. Clinical features and diagnostic methods of primary cutaneous malignant melanoma of the breast are similar to those arising from other cutaneous areas. Treatment of choice is wide local excision with adequate resection margin according to tumor thickness. Sentinel lymph node biopsy should be performed because the presence of lymph node metastasis is the most important prognostic factor. There have been only limited reports involving primary cutaneous malignant melanoma of the breast. Thus, we report a case of primary cutaneous malignant melanoma in a 59-year-old woman with a review of the recent literature.

Surgical Removal of Endovascular Stent after Migration to the Right Ventricle Following Right Subclavian Vein Deployment for Treatment of Central Venous Stenosis

Central venous stenosis or occlusion occurs in 11-50% of hemodialysis patients with prior subclavian vein cannulation and ipsilateral fistula or shunt. Most patients are asymptomatic but some require treatment to reduce the risk of thrombosis and improve inadequate hemodialysis pressure. In these cases, endovascular intervention, including ballooning and stenting, is a feasible strategy for selected patents. We report an unusual case of a 40-year-old man on hemodialysis that underwent endovascular stenting to treat right subclavian vein stenosis and experienced stent migration to the right ventricle, requiring surgical removal.

The Risk Factors for Infectious Complications after Elective Gastrectomy for Gastric Cancer

PURPOSE: Postoperative Infectious complications are recognized as major complications that are associated with surgery. Although many studies have focused on the risk factors of postoperative complications, little is known about the risk factors of infectious complications after gastric cancer surgery, and especially after elective gastrectomy. There is now more and more interest in the risk factors of infectious complications in relation to controlling infection and as indicators of qualitatively assessing infectious complications. The aim of this study was to evaluate the risk factors related with infectious complications after performing elective gastrectomy for treating gastric cancer. MATERIALS AND METHODS: We retrospectively reviewed a total of 788 patients who had undergone elective gastrectomy for gastric cancer between Jan. 2000 and Dec. 2007. The characteristics of the patients were divided according to the patients' factors and the operations' factors. RESULTS: The patients' mean age was 58.9 (range: 24~91) years; 545 were male and 243 were female. The mean duration of the hospital stay was 20.3 days (range: 5~135 days), the mean operation time was 181.3 minutes (range: 65~440 minutes). The total complication rate was 17.1% (n=135) and the complication rate was 38.5% (n=52) among the 135 patients with infectious complications. The infectious complications were surgical site infection (59.7%), pneumonia (19.3%), intra-abdominal abscess (11.5%), pseudomembranous colitis (5.7%), bacteremia (1.9%) and hepatic abscess (1.9%). On the univariate analysis, the significant risk factors were male gender, blood transfusion, smoking at the time of diagnosis, alcohol drinking, diabetes mellitus and previous cardiovascular disease (P<0.05 for all). On multivariate analysis that used a logistic regression model, the significant independent risk factors were smoking at the time of diagnosis (OR: 2.877. 95% CI: 1.449~5.713), blood transfusion (OR: 3.44O, 95% CI: 1.241~9.534), diabetes mellitus (OR: 3.150, 95% CI: 1.518~6.538), and previous cardiovascular disease (OR: 2.784, 95% CI: 1.4731~5.2539). CONCLUSION: Pre- or post-operative blood transfusion and the patient's medical history such as previous cardiovascular disease, diabetes mellitus, smoking etc. are the risk factors for infectious complications after undergoing elective gastrectomy for gastric cancer. The patients that have these risk factors need to be treated with great care to prevent infectious disease after elective gastrectomy.