Keratocystic odontogenic tumor: case report with CT and ultrasonography findings

Sumer, A. Pinar,Sumer, Mahmut,Celenk, Peruze,Danaci, Murat,Gunhan, Omer Korean Academy of Oral and Maxillofacial Radiology 2012 Imaging Science in Dentistry Vol.42 No.1

Keratocystic odontogenic tumor (KCOT) is a benign odontogenic tumor with a potentially aggressive and infiltrative behavior. KCOT is most commonly occurred in mandible and demonstrate a unilocular, round, oval, scalloped radiolucent area, while large lesions may appear multilocular. An important characteristic of KCOT is its propensity to grow in an antero-posterior direction within medullary cavity of bone causing minimal expansion. Definitive diagnosis relies on histological examination. In this report, a KCOT that had an expansion both buccal and lingual cortical bone is described including its features in computed tomography and ultrasonographic exams. The lesion was removed surgically via an intraoral approach under local anesthesia and histologically reported as a KCOT.

Keratocystic odontogenic tumor : Case report with CT and ultrasonography findings

A. Pinar Sumer,Mahmut Sumer,Peruze Celenk,Murat Danaci,Ömer Gunhan 대한구강악안면방사선학회 2012 Imaging Science in Dentistry Vol.42 No.1

Keratocystic odontogenic tumor (KCOT) is a benign odontogenic tumor with a potentially aggressive and infiltrative behavior. KCOT is most commonly occurred in mandible and demonstrate a unilocular, round, oval, scalloped radiolucent area, while large lesions may appear multilocular. An important characteristic of KCOT is its propensity to grow in an antero-posterior direction within medullary cavity of bone causing minimal expansion. Definitive diagnosis relies on histological examination. In this report, a KCOT that had an expansion both buccal and lingual cortical bone is described including its features in computed tomography and ultrasonographic exams. The lesion was removed surgically via an intraoral approach under local anesthesia and histologically reported as a KCOT.

Laparoscopic Gastrectomy and Transvaginal Specimen Extraction in a Morbidly Obese Patient with Gastric Cancer

Sumer, Fatih,Kayaalp, Cuneyt,Karagul, Servet The Korean Gastric Cancer Association 2016 Journal of gastric cancer Vol.16 No.1

Laparoscopic gastrectomy for cancer has some significant postoperative benefits over open surgery with similar oncologic outcomes. This procedure is more popular in the Far East countries where obesity is not a serious public health problem. In the Western countries, laparoscopic gastrectomy for cancer is not a common procedure, yet obesity is more common. Herein, we aimed to demonstrate the feasibility of laparoscopic gastrectomy for advanced gastric cancer in a morbidly obese patient. Additionally, we used natural orifice specimen extraction as an option to decrease wound-related complications, which are more prevalent in morbidly obese patients. In this case, we performed a fully laparoscopic subtotal gastrectomy with lymph node dissection and Roux-en-Y gastrojejunostomy with the specimen extracted through the vagina. To the best of our knowledge, this was the first report of a natural orifice surgery in a morbidly obese patient with gastric cancer.

Laparoscopic Gastrectomy and Transvaginal Specimen Extraction in a Morbidly Obese Patient with Gastric Cancer

Fatih Sumer,Cuneyt Kayaalp,Servet Karagul 대한위암학회 2016 Journal of gastric cancer Vol.16 No.1

Laparoscopic gastrectomy for cancer has some significant postoperative benefits over open surgery with similar oncologic outcomes. This procedure is more popular in the Far East countries where obesity is not a serious public health problem. In the Western countries, laparoscopic gastrectomy for cancer is not a common procedure, yet obesity is more common. Herein, we aimed to demonstrate the feasibility of laparoscopic gastrectomy for advanced gastric cancer in a morbidly obese patient. Additionally, we used natural orifice specimenextraction as an option to decrease wound-related complications, which are more prevalent in morbidly obese patients. In this case, we performed a fully laparoscopic subtotal gastrectomy with lymph node dissection and Roux-en-Y gastrojejunostomy with the specimen extracted through the vagina. To the best of our knowledge, this was the first report of a natural orifice surgery in a morbidly obese patient with gastric cancer.

Does skip metastasis or other lymph node parameters have additional effects on survival of patients undergoing radical cystectomy for bladder cancer?

Ozgur Ugurlu,Sumer Baltaci,Guven Aslan,Cavit Can,Cag Cal,Atilla Elhan,Levent Turkeri,Aydin Mungan 대한비뇨의학회 2015 Investigative and Clinical Urology Vol.56 No.5

Purpose: To investigate the effects of lymph node metastasis, skip metastasis, and other factors related to lymph node status on survival in patients who underwent radical cystectomy (RC) and extended lymph node dissection (eLND). Materials and Methods: RC and eLND were performed in 85 patients with a diagnosis of bladder cancer. Disease-free survival (DFS) and overall survival (OS) were determined by using a Cox proportional hazards model that included the number of excised lymph nodes, the presence of pathological lymph node metastasis, the anatomical level of positive nodes, the number of positive lymph nodes, lymph node density, and the presence of skip metastasis. Results: The mean number of lymph nodes removed per patient was 29.4±9.3. Lymph node positivity was detected in 85 patients (34.1%). The mean follow-up duration was 44.9±27.4 months (2–93 months). Five-year estimated OS and DFS for the 85 patients were 62.6% and 57%, respectively. Three of 29 lymph node-positive patients (10.3%) had skip metastasis. Only lymph node positivity had a significant effect on 5-year OS and DFS (p<0.001). No difference in OS and DFS was found between the three patients with skip metastasis and other lymph node-positive patients. Other factors related to lymph node status had no significant effect on 5-year OS and DFS. Conclusions: No factors related to lymph node status predict DFS and OS, except for lymph node positivity. OS and DFS were comparable between patients with skip metastasis and other lymph node-positive patients.

Treatment of unilateral buccal crossbite with mandibular symphyseal distraction osteogenesis

Ozkalayci, Nurhat,Ozer, Mete,Sumer, Mahmut The Korean Association Of Orthodontists 2011 대한치과교정학회지 Vol.41 No.1

The aim of this report is to present the treatment of a 14-year-old boy with scissors-bite. Mandibular symphyseal distraction osteogenesis (MSDO) with tooth-supported distractor was performed to expand the mandible, and intermaxillary cross elastics were used. The mandible was expanded approximately 9 mm. Asymmetric widening was done by using cross elastics and MSDO simultaneously. The buccal crossbite was corrected successfully. After a 2-year observation period, widening of the mandible using this procedure was judged to be stable.

NORMALIZED DINI FUNCTIONS CONNECTED WITH k-UNIFORMLY CONVEX AND k-STARLIKE FUNCTIONS

ECE, SADETTIN,EKER, SEVTAP SUMER,SEKER, BILAL The Korean Society for Computational and Applied M 2021 Journal of applied mathematics & informatics Vol.39 No.5

The purpose of the present paper is to give sufficient conditions for normalized Dini function which is the special combination of the generalized Bessel function of first kind to be in the classes k-starlike functions and k-uniformly convex functions.

Extended Pelvic Lymph Node Dissection: Before or after Radical Cystectomy? A Multicenter Study of the Turkish Society of Urooncology

Haluk Ozen,Ozgur Ugurlu,Sumer Baltaci,Oztug Adsan,Guven Aslan,Cavit Can,Gurhan Gunaydin,Atilla Elhan,Yasar Beduk 대한비뇨의학회 2012 Investigative and Clinical Urology Vol.53 No.7

Purpose: We aimed to ascertain the effects of performing extended pelvic lymph node dissection (PLND) on the duration of surgery, morbidity, and the number of lymph nodes removed when the dissection was performed before or after radical cystectomy (RC). Materials and Methods: We used the database of our previous prospective multicenter study. A total of 118 patients underwent RC and extended PLND. Of the 118 patients, 48 (40.7%) underwent extended PLND before RC (group 1) and 70 (59.3%) underwent extended PLND after RC (group 2). The two groups were compared for extended PLND time, RC time, and total operation times, per operative morbidity, and the total numbers of lymph nodes removed. Results: Clinical and pathologic characteristics were comparable in the two groups (p>0.05). The mean RC time and mean total operation times were significantly shorter in group 1 than in group 2 (p<0.001). The mean number of lymph nodes removed was 27.31±10.36 in group 1 and 30.87±8.3 in group 2 (p=0.041). Only at the presacral region was the mean number of lymph nodes removed significantly fewer in group 1 than in group 2 (p=0.001). Intraoperative and postoperative complications and drain withdrawal time were similar in both groups (p=0.058, p=0.391, p=0.613, respectively). Conclusions: When extended PLND was performed before RC, the duration of RC and consequently the total duration of the operation were significantly shorter than when extended PLND was performed after RC. Practitioners may consider performing extended PLND before RC and rechecking the presacral area for additional lymph nodes after RC, particularly in elderly patients with high co-morbidity for whom the duration of surgery matters. Purpose: We aimed to ascertain the effects of performing extended pelvic lymph node dissection (PLND) on the duration of surgery, morbidity, and the number of lymph nodes removed when the dissection was performed before or after radical cystectomy (RC). Materials and Methods: We used the database of our previous prospective multicenter study. A total of 118 patients underwent RC and extended PLND. Of the 118 patients, 48 (40.7%) underwent extended PLND before RC (group 1) and 70 (59.3%) underwent extended PLND after RC (group 2). The two groups were compared for extended PLND time, RC time, and total operation times, per operative morbidity, and the total numbers of lymph nodes removed. Results: Clinical and pathologic characteristics were comparable in the two groups (p>0.05). The mean RC time and mean total operation times were significantly shorter in group 1 than in group 2 (p<0.001). The mean number of lymph nodes removed was 27.31±10.36 in group 1 and 30.87±8.3 in group 2 (p=0.041). Only at the presacral region was the mean number of lymph nodes removed significantly fewer in group 1 than in group 2 (p=0.001). Intraoperative and postoperative complications and drain withdrawal time were similar in both groups (p=0.058, p=0.391, p=0.613, respectively). Conclusions: When extended PLND was performed before RC, the duration of RC and consequently the total duration of the operation were significantly shorter than when extended PLND was performed after RC. Practitioners may consider performing extended PLND before RC and rechecking the presacral area for additional lymph nodes after RC, particularly in elderly patients with high co-morbidity for whom the duration of surgery matters.

Maxillary sinus aspergilloma of odontogenic origin: Report of 2 cases with cone-beam computed tomographic findings and review of the literature

Torul, Damla,Yuceer, Ezgi,Sumer, Mahmut,Gun, Seda Korean Academy of Oral and Maxillofacial Radiology 2018 Imaging Science in Dentistry Vol.48 No.2

Aspergilloma of the maxillary sinus is considered rare in immunocompetent patients, but a considerable increase has recently been seen in the incidence of reported cases. Dental procedures involving the antral region are thought to predispose individuals to this form of aspergillosis. Because aspergilloma shares similar clinical features with other sinus pathologies, its diagnosis may be delayed. Thus, an early diagnosis confirmed by a histopathological examination plays a crucial role in the adequate management of aspergilloma. This article provides a concise review of the reported cases of aspergilloma associated with dental procedures and reports 2 new cases of aspergilloma in middle-aged female patients, with a presentation of their cone-beam computed tomographic findings.

Nonlinear finite element analysis of ultra-high performance fiber reinforced concrete beams subjected to impact loads

Gamze Demirtas,Naci Caglar,Yusuf Sumer 국제구조공학회 2022 Structural Engineering and Mechanics, An Int'l Jou Vol.82 No.1

Ultra-high performance fiber reinforced concrete (UHPFRC) is a composite building material with high ductility, fatigue resistance, fracture toughness, durability, and energy absorption capacity. The aim of this study is to develop a nonlinear finite element model that can simulate the response of the UHPFRC beam exposed to impact loads. A nonlinear finite element model was developed in ABAQUS to simulate the real response of UHPFRC beams. The numerical results showed that the model was highly successful to capture the experimental results of selected beams from the literature. A parametric study was carried out to investigate the effects of reinforcement ratio and impact velocity on the response of the UHPFRC beam in terms of midpoint displacement, impact load value, and residual load-carrying capacity. In the parametric study, the nonlinear analysis was performed in two steps for 12 different finite element models. In the first step, dynamic analysis was performed to monitor the response of the UHPFRC beam under impact loads. In the second step, static analysis was conducted to determine the residual load-carrying capacity of the beams. The parametric study has shown that the reinforcement ratio and the impact velocity affect maximum and residual displacement value substantially.