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Martínez-Cuenca R, Luis-Gómez J, Iserte S, Chiva S. On the use of deep learning and computational fluid dynamics for the estimation of uniform momentum source components of propellers. iScience 2023; 26:108297. [PMID: 38025792 PMCID: PMC10663753 DOI: 10.1016/j.isci.2023.108297] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2022] [Revised: 02/16/2023] [Accepted: 10/19/2023] [Indexed: 12/01/2023] Open
Abstract
This article proposes a novel method based on Deep Learning for the resolution of uniform momentum source terms in the Reynolds-Averaged Navier-Stokes equations. These source terms can represent several industrial devices (propellers, wind turbines, and so forth) in Computational Fluid Dynamics simulations. Current simulation methods require huge computational power, rely on strong assumptions or need additional information about the device that is being simulated. In this first approach to the new method, a Deep Learning system is trained with hundreds of Computational Fluid Dynamics simulations with uniform momemtum sources so that it can compute the one representing a given propeller from a reduced set of flow velocity measurements near it. Results show an overall relative error below the 5 % for momentum sources for uniform sources and a moderate error when describing real propellers. This work will allow to simulate more accurately industrial devices with less computational cost.
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Affiliation(s)
- Raúl Martínez-Cuenca
- Department of Mechanical Engineering and Construction, Universitat Jaume I, 12071 Castelló de la Plana, Comunitat Valenciana, Spain
| | - Jaume Luis-Gómez
- Department of Mechanical Engineering and Construction, Universitat Jaume I, 12071 Castelló de la Plana, Comunitat Valenciana, Spain
| | - Sergio Iserte
- Department of Computer Science, Barcelona Supercomputing Center - Centro Nacional de Supercomputación (BSC-CNS), 08034 Barcelona, Cataluña, Spain
| | - Sergio Chiva
- Department of Mechanical Engineering and Construction, Universitat Jaume I, 12071 Castelló de la Plana, Comunitat Valenciana, Spain
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2
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Ciers P, Vanderhaeghe D, Vansteenkiste F, Moubax K, Vanooteghem S, Vanneste A, Van Moerkercke W. Lymphoepithelial cysts of the pancreas: case report and review of the literature. Acta Chir Belg 2023; 123:550-554. [PMID: 35249466 DOI: 10.1080/00015458.2022.2050032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2021] [Accepted: 03/02/2022] [Indexed: 11/01/2022]
Abstract
BACKGROUND Lymphoepithelial cysts (LECs) of the pancreas are a rare type of true pancreatic cysts and represent an estimated 0.5% of all pancreatic cystic lesions. They are benign lesions and have no malignant potential. However, they are hard to differentiate from malignant lesions because their imaging and clinical presentation vary greatly. Seeing as these are benign lesions which are increasingly found incidentally during imaging for other indications, correct diagnosis is important to prevent unnecessary intervention and morbidity. CASE REPORT We report the case of a 41-year-old female who presented with abdominal discomfort, bloating and dyspepsia. An abdominal computed tomography (CT) showed a large mass in the left fossa. We describe the diagnostic and therapeutic measures taken in this case. METHODS We reviewed the literature for common features of the LEC. We grouped common imaging and histological features of the LEC of the pancreas to provide easily identifiable characteristics to facilitate diagnosis. For the review, we focused on papers, mostly case reports, presenting these common characteristics. We also reviewed the literature for key topics that should be taken into account when considering therapeutic interventions in a patient with a possible diagnosis of a LEC. CONCLUSION Cysts of the pancreas are increasingly identified due to widespread use and improved resolution of cross-sectional imaging. To obtain the correct diagnosis, it is sometimes necessary to combine advanced imaging, i.e. CT and MRI-imaging, and endoscopic ultrasound with fine needle aspiration (EUS/FNA), while CA 19-9 also has diagnostic value. We summarize all diagnostic characteristics in a table for ease of use. Furthermore we summarized possible therapeutic interventions.
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Affiliation(s)
- Philippe Ciers
- Department of Vascular Surgery, Klinikum Westmunsterland GmbH, Bocholt, Germany
| | | | | | - Kim Moubax
- Department of Gastroenterology, AZ Groeninge, Kortrijk, Belgium
| | - Sofie Vanooteghem
- Department of Gastroenterology, OLV van Lourdes Hospital, Waregem, Belgium
| | - Alain Vanneste
- Department of Pathological Anatomy, AZ Groeninge, Kortrijk, Belgium
| | - Wouter Van Moerkercke
- Department of Gastroenterology, AZ Groeninge, Kortrijk, Belgium
- Department of Gastroenterology and Hepatology, University Hospitals Leuven, UZ Leuven, Leuven, Belgium
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3
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Khristenko E, Garcia EE, Gaida MM, Hackert T, Mayer P, Kauczor HU, Klauss M. Lymphoepithelial cyst of the pancreas: can common imaging features help to avoid resection? Langenbecks Arch Surg 2023; 408:82. [PMID: 36773118 PMCID: PMC9922238 DOI: 10.1007/s00423-023-02777-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2022] [Accepted: 12/19/2022] [Indexed: 02/12/2023]
Abstract
BACKGROUND Differentiation of cystic pancreatic neoplasms remains a challenging task for radiologists regarding the main aim of identifying malignant and premalignant lesions. PURPOSE The study aimed to compare the radiological features of lymphoepithelial cysts (LEC) with other cystic pancreatic lesions, which could help to differentiate them in order to avoid unnecessary resection. MATERIAL AND METHODS We retrospectively reviewed 10 cases of resected and histopathologically confirmed LECs during a 12-year period with available imaging studies; 20 patients with mucinous cystic neoplasms (MCN), 20 patients with branch-duct intraductal papillary mucinous neoplasms (BD-IPMN), and 20 patients with serous cystic neoplasms (SCN) were selected to serve as control groups. Imaging findings as well as clinical data were analyzed. RESULTS The following imaging morphology of LEC was identified: simple cystic appearance (20%) and mixed cystic-solid appearance (80%) with either a diffuse subsolid component (30%) or mural nodule(s) (50%). All lesions revealed exophytic location with a strong male predominance (9:1). MCNs occurred exclusively in middle-aged women, IPMN in both sexes showed slight male predominance (13:7), and SCN showed female predominance (5:15). Median patient age in LEC (48.5, IQR 47-54.5) was significantly younger compared to IPMN (p < 0.001) and SCN (p = 0.02). Unenhanced CT attenuation of LEC was higher than MCNs (p = 0.025) and IPMNs (p = 0.021), showing no significant difference to SCN (p = 0.343). CONCLUSION The present study provides key radiological features of LEC for the differentiation from other cystic pancreatic lesions such as increased CT attenuation in the unenhanced phase, absence of a connection to the main pancreatic duct (MPD), and exophytic location. In addition to these imaging features, clinical data, such as male predominance in LEC, must be considered for the differentiation of cystic pancreatic lesions.
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Affiliation(s)
- Ekaterina Khristenko
- Department of Diagnostical and Interventional Radiology, Heidelberg University Hospital, Im Neuenheimer Feld 420, 69120, Heidelberg, Germany.
| | - Elena Esteban Garcia
- Department of Radiology, Sofia General University Hospital, Av. Intendente Jorge Palacois, 1, 30003, ReinaMurcia, Spain
| | - Matthias M Gaida
- Department of Pathology, Johannes Gutenberg University, Saarstrasse 21, 55122, Mainz, Germany
| | - Thilo Hackert
- Department of General, Visceral, and Transplantation Surgery, Heidelberg University Hospital, Im Neuenheimer Feld 420, 69120, Heidelberg, Germany
| | - Philipp Mayer
- Department of Diagnostical and Interventional Radiology, Heidelberg University Hospital, Im Neuenheimer Feld 420, 69120, Heidelberg, Germany
| | - Hans-Ulrich Kauczor
- Department of Diagnostical and Interventional Radiology, Heidelberg University Hospital, Im Neuenheimer Feld 420, 69120, Heidelberg, Germany
| | - Miriam Klauss
- Department of Diagnostical and Interventional Radiology, Heidelberg University Hospital, Im Neuenheimer Feld 420, 69120, Heidelberg, Germany
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Luchini C, Fassan M, Doglioni C, Capelli P, Ingravallo G, Renzulli G, Pecori S, Paolino G, Florena AM, Scarpa A, Zamboni G. Inflammatory and tumor-like lesions of the pancreas. Pathologica 2021; 112:197-209. [PMID: 33179622 PMCID: PMC7931580 DOI: 10.32074/1591-951x-168] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2020] [Accepted: 07/07/2020] [Indexed: 12/12/2022] Open
Abstract
Inflammatory/tumor-like lesions of the pancreas represent a heterogeneous group of diseases that can variably involve the pancreatic gland determining different signs and symptoms. In the category of inflammatory/tumor-like lesions of the pancreas, the most important entities are represented by chronic pancreatitis, which includes alcoholic, obstructive and hereditary pancreatitis, paraduodenal (groove) pancreatitis, autoimmune pancreatitis, lymphoepithelial cyst, pancreatic hamartoma and intrapancreatic accessory spleen. An in-depth knowledge of such diseases is essential, since they can cause severe morbidity and may represent a potential life-threatening risk for patients. Furthermore, in some cases the differential diagnosis with malignant tumors may be challenging. Herein we provide a general overview of all these categories, with the specific aim of highlighting their most important clinic-pathological hallmarks to be used in routine diagnostic activities and clinical practice.
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Affiliation(s)
- Claudio Luchini
- Department of Diagnostics and Public Health, Section of Pathology, University and Hospital Trust of Verona, Verona, Italy
| | - Matteo Fassan
- Surgical Pathology Unit, Department of Medicine (DIMED), University of Padua, Italy
| | - Claudio Doglioni
- Vita e Salute University, Milan, Italy.,Pathology Unit, Pancreas Translational and Clinical Research Center, IRCCS San Raffaele Scientific Institute, Milan, Italy
| | - Paola Capelli
- Department of Diagnostics and Public Health, Section of Pathology, University and Hospital Trust of Verona, Verona, Italy
| | - Giuseppe Ingravallo
- Department of Emergency and Organ Transplantation, Section of Pathological Anatomy, University of Bari Aldo Moro, Bari, Italy
| | - Giuseppina Renzulli
- Department of Emergency and Organ Transplantation, Section of Pathological Anatomy, University of Bari Aldo Moro, Bari, Italy
| | - Sara Pecori
- Department of Diagnostics and Public Health, Section of Pathology, University and Hospital Trust of Verona, Verona, Italy
| | - Gaetano Paolino
- Department of Diagnostics and Public Health, Section of Pathology, University and Hospital Trust of Verona, Verona, Italy
| | - Ada M Florena
- Department of Sciences for Promotion of Health and Mother and Child Care, Anatomic Pathology, University of Palermo, Italy
| | - Aldo Scarpa
- Department of Diagnostics and Public Health, Section of Pathology, University and Hospital Trust of Verona, Verona, Italy.,ARC-NET Research Centre, University of Verona, Verona, Italy
| | - Giuseppe Zamboni
- Department of Diagnostics and Public Health, Section of Pathology, University and Hospital Trust of Verona, Verona, Italy.,IRCSS Sacro Cuore Don Calabria Hospital, Negrar, Italy
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Navarro SM, Corwin MT, Katz DS, Lamba R. Incidental Pancreatic Cysts on Cross-Sectional Imaging. Radiol Clin North Am 2021; 59:617-629. [PMID: 34053609 DOI: 10.1016/j.rcl.2021.03.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Incidental pancreatic cysts are commonly encountered in radiology practice. Although some of these are benign, mucinous varieties have a potential to undergo malignant transformation. Characterization of some incidental pancreatic cysts based on imaging alone is limited, and given that some pancreatic cysts have a malignant potential, various societies have created guidelines for the management and follow-up of incidental pancreatic cysts. This article reviews the imaging findings and work-up of pancreatic cysts and gives an overview of the societal guidelines for the management and follow-up of incidental pancreatic cysts.
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Affiliation(s)
- Shannon M Navarro
- Department of Radiology, UC Davis, 4860 Y Street, Suite 3100, Sacramento, CA 95817, USA.
| | - Michael T Corwin
- Department of Radiology, UC Davis, 4860 Y Street, Suite 3100, Sacramento, CA 95817, USA
| | - Douglas S Katz
- Department of Radiology, NYU Winthrop, 259 First Street, Mineola, NY 11501, USA
| | - Ramit Lamba
- Department of Radiology, UC Davis, 4860 Y Street, Suite 3100, Sacramento, CA 95817, USA
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A Rare Presentation of Pancreatic Lymphoepithelial Cyst: A Case Report and Review. Case Rep Med 2020; 2020:4590758. [PMID: 32099546 PMCID: PMC7040412 DOI: 10.1155/2020/4590758] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2019] [Accepted: 01/18/2020] [Indexed: 11/21/2022] Open
Abstract
Pancreatic lymphoepithelial cyst (LEC) is a rare, benign collection of keratinizing squamous epithelial cells encapsulated by lymphoid tissue. Because of its limited data and nonspecific features that can mimic malignant lesions, LECs can lead to unnecessary operations. A 62-year-old male with a known pancreatic mass presented with abdominal pain. CT scan showed an increased mass in the pancreatic head, and endoscopic ultrasound-guided fine needle aspiration (EUS-FNA) revealed “rare fragments of benign-appearing squamous epithelium in a background of keratin debris, cyst contents, and scattered lymphocytes,” consistent with a lymphoepithelial cyst. Pancreatic LEC is an extremely rare lesion that comprises of only 0.5% of all pancreatic cysts. EUS-FNA has become the mainstay for diagnosing pancreatic LECs. Given the slow growing and benign nature, conservative management and observation is adequate for pancreatic LECs with excellent long-term outcome. With increasing number of imaging ordered by clinicians, it is anticipated that there will be a greater number of incidental pancreatic LECs detected. Thus, EUS-FNA should be utilized more frequently to help distinguish benign pancreatic LECs from premalignant or malignant lesions to avoid surgery.
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Abstract
Multidetector computed tomography (MDCT) is a widely used cross-sectional imaging modality for initial evaluation of patients with suspected pancreatic ductal adenocarcinoma (PDAC). However, diagnosis of PDAC can be challenging due to numerous pitfalls associated with image acquisition and interpretation, including technical factors, imaging features, and cognitive errors. Accurate diagnosis requires familiarity with these pitfalls, as these can be minimized using systematic strategies. Suboptimal acquisition protocols and other technical errors such as motion artifacts and incomplete anatomical coverage increase the risk of misdiagnosis. Interpretation of images can be challenging due to intrinsic tumor features (including small and isoenhancing masses, exophytic masses, subtle pancreatic duct irregularities, and diffuse tumor infiltration), presence of coexisting pathology (including chronic pancreatitis and intraductal papillary mucinous neoplasm), mimickers of PDAC (including focal fatty infiltration and focal pancreatitis), distracting findings, and satisfaction of search. Awareness of pitfalls associated with the diagnosis of PDAC along with the strategies to avoid them will help radiologists to minimize technical and interpretation errors. Cognizance and mitigation of these errors can lead to earlier PDAC diagnosis and ultimately improve patient prognosis.
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The Value of Contrast-Enhanced Ultrasound Classification in Diagnosis of Pancreatic Cystic Lesions. BIOMED RESEARCH INTERNATIONAL 2019; 2019:5698140. [PMID: 31737668 PMCID: PMC6815540 DOI: 10.1155/2019/5698140] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/28/2019] [Accepted: 09/12/2019] [Indexed: 12/14/2022]
Abstract
Objective To compare the consistency of contrast-enhanced ultrasound (CEUS) classification results with magnetic resonance imaging (MRI) and to investigate the diagnostic value of CEUS classification in pancreatic cystic lesions. Methods 84 cases of pancreatic cystic lesions were enrolled in this study. According to the CEUS classification methods of previous study in our center, all the lesions were classified into four types: type I, unilocular cysts; type II, microcystic lesions; type III, macrocystic lesions; and type IV, cystic lesions with enhanced solid components. The consistency of CEUS and MRI typing results was analysed. Among the 84 cases, 45 cases had pathological results. The CEUS results were compared with the pathological results, and the diagnostic value of CEUS classification in diagnosing pancreatic cystic lesions was explored. Results Among the 84 cases, CEUS diagnosed 8 cases of type I, 24 of type II, 8 of type III, and 45 of type IV. MRI diagnosed 10 cases of type I, 25 of type II, 7 of type III, and 43 of type IV. The classification typing results of CEUS were highly consistent with that of enhanced MRI (kappa value: 0.852). Among the 45 cases with pathological results, the diagnostic accuracy of each type was 91.1%, 95.6%, 93.3%, and 88.9%. The accuracy of CEUS and MRI in diagnosing pancreatic cystic lesions was 75.56% (34/45) and 80% (36/45), respectively. The diagnostic accuracy of CEUS had no significant difference from that of MRI (P=0.687). Conclusion The classification results by CEUS and MRI are in excellent agreement. The classification of pancreatic cystic lesions by CEUS is significantly helpful for clinical diagnosis.
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Namba Y, Oshita A, Nishisaka T, Namba M, Sasaki T, Matsugu Y, Itamoto T. Lymphoepithelial cyst of the pancreas: A case report and summary of imaging features of pancreatic cysts. Int J Surg Case Rep 2019; 55:192-195. [PMID: 30763861 PMCID: PMC6374521 DOI: 10.1016/j.ijscr.2019.01.022] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2018] [Revised: 01/15/2019] [Accepted: 01/22/2019] [Indexed: 01/03/2023] Open
Abstract
A lymphoepithelial cyst (LEC) of the pancreas is a benign and rare lesion. A pancreatic LEC is difficult to be diagnosed and differentiate from the malignancy preoperatively. We summarized the imaging features of pancreatic cysts to differentiate from the malignancy.
Introduction A lymphoepithelial cyst (LEC) of the pancreas is a benign and rare lesion that is difficult to diagnose preoperatively based on imaging studies. Presentation of case We report a case of a 49-year-old man who presented with weight loss and diarrhea. The serum carcinoembryonic antigen and carbohydrate antigen 19-9 levels were slightly elevated to 6.7 ng/mL (reference value <5.0 ng/mL) and 45 U/mL (reference value <37 U/mL), respectively. Computed tomography showed a large cystic mass with internal septa in the pancreatic tail. The cystic wall and the septa showed enhancement while the cystic contents remained unenhanced. Magnetic resonance imaging (MRI) demonstrated a multiple-ball-like lesion with low signal intensity on T1-weighted image and high signal intensity on T2-weighted image. Diffusion-weighted MRI showed high signal intensity in the central and iso-signal intensity in the peripheral portions of the cystic lesion. The cystic wall and septa showed high signal intensity, and the cystic contents showed low signal intensity on an enhanced MRI. Endoscopic ultrasonography showed a cyst with multiple high-echoic lesions in the pancreatic tail. A mucinous cystic neoplasm and branch duct intraductal papillary mucinous neoplasm were considered among the differential diagnoses, and we performed distal pancreatectomy with concomitant splenectomy and lymphadenectomy for both diagnostic and therapeutic purposes. Histopathological findings revealed that the cystic wall was lined by stratified squamous epithelium, and several lymphoid follicles and a few sebaceous glands were observed within the cystic wall without hair follicles, leading to the final diagnosis of an LEC. Conclusion We report a rare case of a pancreatic LEC, which was difficult to be diagnosed and summarize the imaging features of pancreatic cysts to differentiate from the malignancy preoperatively.
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Affiliation(s)
- Yosuke Namba
- Department of Gastroenterological Surgery, Hiroshima Prefectural Hospital, Japan
| | - Akihiko Oshita
- Department of Gastroenterological Surgery, Hiroshima Prefectural Hospital, Japan; Department of Gastroenterological and Transplant Surgery, Applied Life Sciences, Institute of Biomedical & Health Sciences, Hiroshima University, Japan.
| | - Takashi Nishisaka
- Department of Pathology Clinical Laboratory, Hiroshima Prefectural Hospital, Japan
| | - Maiko Namba
- Department of Gastroenterology, Hiroshima Prefectural Hospital, Japan
| | - Tamito Sasaki
- Department of Gastroenterology, Hiroshima Prefectural Hospital, Japan
| | - Yasuhiro Matsugu
- Department of Gastroenterological Surgery, Hiroshima Prefectural Hospital, Japan
| | - Toshiyuki Itamoto
- Department of Gastroenterological Surgery, Hiroshima Prefectural Hospital, Japan; Department of Gastroenterological and Transplant Surgery, Applied Life Sciences, Institute of Biomedical & Health Sciences, Hiroshima University, Japan
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Groot VP, Thakker SS, Gemenetzis G, Noë M, Javed AA, Burkhart RA, Noveiry BB, Cameron JL, Weiss MJ, VandenBussche CJ, Fishman EK, Hruban RH, Wolfgang CL, Lennon AM, He J. Lessons learned from 29 lymphoepithelial cysts of the pancreas: institutional experience and review of the literature. HPB (Oxford) 2018. [PMID: 29530477 DOI: 10.1016/j.hpb.2018.01.003] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
BACKGROUND Lymphoepithelial cysts (LECs) are rare pancreatic cystic lesions. Since LECs are benign, preoperative diagnosis is important to differentiate from a cystic neoplasm and avoid unnecessary surgery. The aim of this study was to identify clinical, radiographic and cytopathologic features associated with LECs. METHODS A retrospective review was performed of patients diagnosed with LEC between 1995 and 2017 at our hospital. Clinicopathologic and radiographic imaging features were documented. RESULTS Of 29 patients with pancreatic LEC, 22 underwent surgical resection. The majority were male (n = 24) with a median age of 55 years (range, 21-74). During the evaluation, all patients underwent a CT, with endoscopic ultrasound (EUS) guided fine needle aspiration (FNA) biopsy (n = 22) and/or MRI/MRCP (n = 11) performed in a smaller number of patients. A combination of exophytic tumor growth on imaging and the presence of specific cytomorphologic features on the EUS-FNA cytology biopsy led to the correct diagnosis of LEC and prevention of unnecessary surgery in 7 patients. DISCUSSION Differentiating LECs from premalignant pancreatic cystic neoplasms remains difficult. Findings of an exophytic growth pattern of the lesion on abdominal imaging and the presence of specific cytomorphologic features in the EUS-FNA biopsy could help clinicians diagnose LEC preoperatively.
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Affiliation(s)
- Vincent P Groot
- Department of Surgery, The Sol Goldman Pancreatic Cancer Research Center, The Johns Hopkins University School of Medicine, Baltimore, MD, USA; Department of Surgery, UMC Utrecht Cancer Center, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Sameer S Thakker
- Department of Surgery, The Sol Goldman Pancreatic Cancer Research Center, The Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Georgios Gemenetzis
- Department of Surgery, The Sol Goldman Pancreatic Cancer Research Center, The Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Michaël Noë
- Department of Pathology, The Sol Goldman Pancreatic Cancer Research Center, The Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Ammar A Javed
- Department of Surgery, The Sol Goldman Pancreatic Cancer Research Center, The Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Richard A Burkhart
- Department of Surgery, The Sol Goldman Pancreatic Cancer Research Center, The Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Behnoud B Noveiry
- Department of Gastroenterology, The Sol Goldman Pancreatic Cancer Research Center, The Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - John L Cameron
- Department of Surgery, The Sol Goldman Pancreatic Cancer Research Center, The Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Matthew J Weiss
- Department of Surgery, The Sol Goldman Pancreatic Cancer Research Center, The Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Christopher J VandenBussche
- Department of Pathology, The Sol Goldman Pancreatic Cancer Research Center, The Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Elliot K Fishman
- Department of Radiology, The Sol Goldman Pancreatic Cancer Research Center, The Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Ralph H Hruban
- Department of Pathology, The Sol Goldman Pancreatic Cancer Research Center, The Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Christopher L Wolfgang
- Department of Surgery, The Sol Goldman Pancreatic Cancer Research Center, The Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Anne Marie Lennon
- Department of Surgery, The Sol Goldman Pancreatic Cancer Research Center, The Johns Hopkins University School of Medicine, Baltimore, MD, USA; Department of Gastroenterology, The Sol Goldman Pancreatic Cancer Research Center, The Johns Hopkins University School of Medicine, Baltimore, MD, USA; Department of Radiology, The Sol Goldman Pancreatic Cancer Research Center, The Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Jin He
- Department of Surgery, The Sol Goldman Pancreatic Cancer Research Center, The Johns Hopkins University School of Medicine, Baltimore, MD, USA.
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Abstract
The pancreas is a complex organ that may give rise to large number of neoplasms and non-neoplastic lesions. This article focuses on benign neoplasms, such as serous neoplasms, and tumorlike (pseudotumoral) lesions that may be mistaken for neoplasm not only by clinicians and radiologists, but also by pathologists. The family of pancreatic pseudotumors, by a loosely defined conception of that term, includes a variety of lesions including heterotopia, hamartoma, and lipomatous pseudohypertrophy. Autoimmune pancreatitis and paraduodenal ("groove") pancreatitis may also lead to pseudotumor formation. Knowledge of these entities will help in making an accurate diagnosis.
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Affiliation(s)
- Olca Basturk
- Memorial Sloan Kettering Cancer Center, New York, NY, USA.
| | - Gokce Askan
- Memorial Sloan Kettering Cancer Center, New York, NY, USA
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12
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Abstract
A variety of pancreatic and peripancreatic neoplasms may contain calcifications. We present a review of common to uncommon pancreatic neoplasms that may contain calcifications to include ductal adenocarcinoma, pancreatic neuroendocrine tumors, serous cystadenomas, solid pseudopapillary tumors, intraductal papillary mucinous neoplasms, mucinous cystic neoplasms, and lymphoepithelial cysts. In addition, duodenal mucinous adenocarcinoma can present as a peripancreatic mass that may contain calcification. Knowledge of the spectrum of calcification patterns can help the interpreting radiologist provide a meaningful differential.
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Mittal PK, Harri P, Nandwana S, Moreno CC, Muraki T, Adsay V, Cox K, Pehlivanoglu B, Alexander LF, Chatterjee A, Miller FH. Paraduodenal pancreatitis: benign and malignant mimics at MRI. Abdom Radiol (NY) 2017; 42:2652-2674. [PMID: 28660333 DOI: 10.1007/s00261-017-1238-9] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Paraduodenal pancreatitis, also known as groove pancreatitis, is a rare form of chronic pancreatitis that masquerades as pancreatic adenocarcinoma affecting the pancreaticoduodenal groove, a potential space between the head of the pancreas, duodenum, and common bile duct. Two forms of groove pancreatitis have been described. The segmental form involves the pancreatic head with development of scar tissue within the groove, whereas the pure form affects the groove only, sparing the pancreatic head. Imaging findings of groove pancreatitis often overlap with primary duodenal, ampullary, or pancreatic neoplasms, which often results in a diagnostic challenge. In addition, paraduodenal pancreatitis can be mistaken for cystic pancreatic lesions, especially when there is involvement of the duodenal wall. Preoperative recognition of this entity is very important in order to avoid unnecessary procedures, although surgery, such as pancreaticoduodenectomy, may still be required to relieve obstructive symptoms. In this article, the pathophysiology and magnetic resonance imaging characteristics of paraduodenal pancreatitis and important benign and malignant mimics are discussed.
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Affiliation(s)
- Pardeep K Mittal
- Department of Radiology and Imaging Sciences, Emory University School of Medicine, 1365 Clifton Road NE, Building A, Suite AT-627, Atlanta, GA, 30322, USA.
| | - Peter Harri
- Department of Radiology and Imaging Sciences, Emory University School of Medicine, 1365 Clifton Road NE, Building A, Suite AT-627, Atlanta, GA, 30322, USA
| | - Sadhna Nandwana
- Department of Radiology and Imaging Sciences, Emory University School of Medicine, 1365 Clifton Road NE, Building A, Suite AT-627, Atlanta, GA, 30322, USA
| | - Courtney C Moreno
- Department of Radiology and Imaging Sciences, Emory University School of Medicine, 1365 Clifton Road NE, Building A, Suite AT-627, Atlanta, GA, 30322, USA
| | - Takashi Muraki
- Department of Pathology, Emory University School of Medicine, Atlanta, GA, USA
| | - Volkan Adsay
- Department of Pathology, Emory University School of Medicine, Atlanta, GA, USA
| | - Kelly Cox
- Department of Radiology and Imaging Sciences, Emory University School of Medicine, 1365 Clifton Road NE, Building A, Suite AT-627, Atlanta, GA, 30322, USA
| | - Burcin Pehlivanoglu
- Department of Pathology, Emory University School of Medicine, Atlanta, GA, USA
| | - Lauren F Alexander
- Department of Radiology and Imaging Sciences, Emory University School of Medicine, 1365 Clifton Road NE, Building A, Suite AT-627, Atlanta, GA, 30322, USA
| | - Argha Chatterjee
- Department of Radiology Northwestern Memorial Hospital, Northwestern University Feinberg School of Medicine, Chicago, IL, USA
| | - Frank H Miller
- Department of Radiology Northwestern Memorial Hospital, Northwestern University Feinberg School of Medicine, Chicago, IL, USA
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Borhani AA, Fasanella KE, Iranpour N, Zureikat AH, Singhi AD, Furlan A, Dasyam AK. Lymphoepithelial cyst of pancreas: spectrum of radiological findings with pathologic correlation. Abdom Radiol (NY) 2017; 42:877-883. [PMID: 27738791 DOI: 10.1007/s00261-016-0932-3] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
PURPOSE The purpose of the study was to investigate imaging features as well as pathologic and clinical findings of lymphoepithelial cyst (LEC) of pancreas. MATERIALS AND METHODS Ten patients with surgically resected and pathologically proven LEC, found in a single institution database between 2000 and 2015, were evaluated in a retrospective fashion. Patients' demographics, clinical presentation, co-morbidities, imaging features, cytology and histopathology results, and serum/aspirate biomarkers levels were recorded. RESULTS Eighty percent of patients were male with median age of 59. All lesions were exophytic, with median size of 36 mm. 80% were classified as complex cystic lesions, showing enhancing septa or enhancing rim without measurable enhancing solid component. 80% were located in tail or body. In one patient with MRI, the lesion was mildly T1 hyperintense and markedly T2 hyperintense. All cases were anechoic or hypoechoic on EUS, and majority of them showed posterior acoustic enhancement. Of patients with available fluid aspirate analysis, 3 out of 4 had CEA level > 192 ng/mL and 1 out of 3 had elevated (>250 IU/ml) amylase level. Four out of 7 patients had elevated serum CA 19-9 levels (>37 U/mL); one patient with a value of 361 U/mL had co-existing pancreatic adenocarcinoma. CONCLUSION Round shape, mild complexity, and exophytic location in pancreatic body and tail can be suggestive of LECs. These features however are not specific and may be seen with other cystic pancreatic lesions. CT findings should be used in conjunction with EUS, cytology, and tumor marker studies to secure the diagnosis of LEC.
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Affiliation(s)
- Amir A Borhani
- Division of Abdominal Imaging, University of Pittsburgh School of Medicine, UPMC Presbyterian, Radiology Suite 200 East Wing, 200 Lothrop Street, Pittsburgh, PA, 15213, USA.
| | - Kenneth E Fasanella
- Division of Gastroenterology and Hepatology, University of Pittsburgh School of Medicine, UPMC Presbyterian, 200 Lothrop Street, Pittsburgh, PA, 15213, USA
| | - Negaur Iranpour
- Division of Abdominal Imaging, Department of Radiology, University of Pittsburgh Medical Center, UPMC Presbyterian, Radiology Suite 200 East Wing, 200 Lothrop Street, Pittsburgh, PA, 15213, USA
| | - Amer H Zureikat
- Division of Surgical Oncology, University of Pittsburgh Medical Center, 5150 Centre Ave, Suite 421, Pittsburgh, PA, 15232, USA
| | - Aatur D Singhi
- Department of Pathology, University of Pittsburgh School of Medicine, 200 Lothrop Street, Scaife Hall A616.2, Pittsburgh, PA, 15213, USA
| | - Alessandro Furlan
- Division of Abdominal Imaging, University of Pittsburgh School of Medicine, UPMC Presbyterian, Radiology Suite 200 East Wing, 200 Lothrop Street, Pittsburgh, PA, 15213, USA
| | - Anil K Dasyam
- Division of Abdominal Imaging, University of Pittsburgh School of Medicine, UPMC Presbyterian, Radiology Suite 200 East Wing, 200 Lothrop Street, Pittsburgh, PA, 15213, USA
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15
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Arumugam P, Fletcher N, Kyriakides C, Mears L, Kocher HM. Lymphoepithelial Cyst of the Pancreas. Case Rep Gastroenterol 2016; 10:181-92. [PMID: 27403123 PMCID: PMC4929368 DOI: 10.1159/000445373] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/22/2015] [Accepted: 03/10/2016] [Indexed: 02/01/2023] Open
Abstract
Lymphoepithelial cyst (LEC) of the pancreas is an extremely rare, benign pancreatic cystic lesion that is difficult to differentiate preoperatively from other cystic pancreatic lesions. LEC may have malignant potential. Here, we describe a case of LEC of the pancreas - initially suspected to be a mucinous cyst neoplasm - in an elderly man presenting with abdominal pain, who went on to have a distal pancreatectomy and splenectomy. We also review the relevant literature and discuss implications for the diagnosis and management of this rare lesion.
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Affiliation(s)
- Prabhu Arumugam
- Department of HPB Surgery, Barts and the London HPB Centre, Barts Health NHS Trust, The Royal London Hospital, London, United Kingdom
| | - Natalie Fletcher
- Department of HPB Surgery, Barts and the London HPB Centre, Barts Health NHS Trust, The Royal London Hospital, London, United Kingdom
| | - Charis Kyriakides
- Department of HPB Surgery, Barts and the London HPB Centre, Barts Health NHS Trust, The Royal London Hospital, London, United Kingdom
| | - Lisa Mears
- Department of HPB Pathology, Barts and the London HPB Centre, Barts Health NHS Trust, The Royal London Hospital, London, United Kingdom
| | - Hemant M Kocher
- Department of HPB Surgery, Barts and the London HPB Centre, Barts Health NHS Trust, The Royal London Hospital, London, United Kingdom
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16
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Cystic and Pseudocystic Lesions of the Pancreas. CURRENT RADIOLOGY REPORTS 2016. [DOI: 10.1007/s40134-016-0150-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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17
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Ku YM, Lee SL, Kim KH, Seo KJ. Exophytic lymphoepithelial cyst of the pancreas. Clin Res Hepatol Gastroenterol 2015; 39:405-7. [PMID: 25704060 DOI: 10.1016/j.clinre.2014.09.004] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/18/2014] [Revised: 09/02/2014] [Accepted: 09/08/2014] [Indexed: 02/04/2023]
Affiliation(s)
- Young Mi Ku
- Department of Radiology, Uijeongbu St. Mary's Hospital, College of Medicine, The Catholic University of Korea, 271 Cheonbo-ro, Uijeongbu 480-717, Republic of Korea
| | - Su Lim Lee
- Department of Radiology, Uijeongbu St. Mary's Hospital, College of Medicine, The Catholic University of Korea, 271 Cheonbo-ro, Uijeongbu 480-717, Republic of Korea
| | - Kee Hwan Kim
- Department of Surgery, Uijeongbu St. Mary's Hospital, College of Medicine, The Catholic University of Korea, 271 Cheonbo-ro, Uijeongbu 480-717, Republic of Korea
| | - Kyung-Jin Seo
- Department of Hospital Pathology, Uijeongbu St. Mary's Hospital, College of Medicine, The Catholic University of Korea, 271 Cheonbo-ro, Uijeongbu 480-717, Republic of Korea.
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18
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Ryu DH, Sung RH, Kang MH, Choi JW. Lymphoepithelial cyst of the pancreas mimicking malignant cystic tumor: report of a case. KOREAN JOURNAL OF HEPATO-BILIARY-PANCREATIC SURGERY 2015; 19:129-32. [PMID: 26379736 PMCID: PMC4568600 DOI: 10.14701/kjhbps.2015.19.3.129] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/10/2015] [Revised: 07/30/2015] [Accepted: 08/15/2015] [Indexed: 11/17/2022]
Abstract
Lymphoepithelial cysts of the pancreas are a type of true cyst that can mimic pseudocysts and cystic neoplasms. They are very rare, non-malignant lesions that are unilocular or multilocular cystic lesions lined predominantly by mature squamous epithelium and surrounded by non-neoplastic lymphoid elements. We, herein, present a patient with a cystic pancreas tumor mimicking a malignant cystic neoplasm. The patient was admitted with upper abdominal discomfort. Computed tomography showed a 64×39 mm cystic mass in the pancreas tail. She underwent distal pancreatectomy and splenectomy. In the fluid analysis of the pancreas cystic mass, the CEA and CA19-9 were 618 ng/ml and 3.9 U/ml, respectively. The resected pancreas specimen showed a 6.5 cm-sized cyst the pancreas tail. The cyst was well circumscribed and multilocular. The final pathology report of the resected pancreas specimen noted that the cyst was multilocular, and the cyst lining was showing stratified squamous epithelium covering the lymphoid tissue (containing lymphoid follicles), which was consistent with a lymphoepithelial cyst. The patient recovered uneventfully from surgery and has been doing well for the past 3 months. A differential diagnosis of cystic pancreatic lesions is important. We suggest that lymphoepithelial cysts, although very rare, may be included in the differential diagnosis of cystic pancreatic tumors.
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Affiliation(s)
- Dong Hee Ryu
- Department of Surgery, Chungbuk National University, College of Medicine and Medical Research Institute, Cheongju, Korea
| | - Ro Hyun Sung
- Department of Pathology, Chungbuk National University, College of Medicine and Medical Research Institute, Cheongju, Korea
| | - Min Ho Kang
- Department of Radiology, Chungbuk National University, College of Medicine and Medical Research Institute, Cheongju, Korea
| | - Jae Woon Choi
- Department of Surgery, Chungbuk National University, College of Medicine and Medical Research Institute, Cheongju, Korea
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19
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Tirkes T, Patel A, Cramer H, Evrimler S, DeWitt JM, Al-Haddad M. Lymphoepithelial Cysts of the Pancreas: CT and MRI Features. EUROPEAN MEDICAL JOURNAL 2015. [DOI: 10.33590/emj/22-00053] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
Objective: Describe CT and MRI features of the lymphoepithelial cyst (LEC) of the pancreas.
Methods: The authors identified 13 cases of LEC by searching their institutional electronic medical archives from 2004 to 2020. All of the patients had CT scans and six patients had both a CT and MRI. The final diagnosis was established either by fine-needle aspiration with cytopathology (n=6) or surgical resection (n=7).
Results: The mean diameter of the cysts was 36 mm (range: 6–93 mm). Almost all of the cysts were exophytic (92%) and solitary (85%), favouring the tail (54%) or body (38%) of the pancreas. LECs were either oval (62%) or round (39%) and had well-defined contours. All LECs showed T2 hyperintensity and T1 hypointensity; however, the signal was heterogeneous. Diffusion-weighted imaging showed restricted diffusion in all cases. On CT, LECs commonly showed complex fluid density (>15 HU) with no visible septation, enhancement or calcification.
Conclusion: LECs have a distinguishing feature on MRI, which is restricted diffusion on diffusion-weighted imaging. This is presumably secondary to the presence of keratin, which can be a helpful feature differentiating LECs from other pancreatic cystic neoplasms. Besides this, LECs predominantly appear as solitary and exophytic lesions, with complex fluid density on CT and heterogeneous hypointense T1 and heterogenous hyperintense T2 signal on MRI.
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Affiliation(s)
- Temel Tirkes
- Department of Radiology, Indiana University School of Medicine, Indianapolis, USA
| | - Aashish Patel
- Department of Radiology, Indiana University School of Medicine, Indianapolis, USA
| | - Harvey Cramer
- Department of Pathology, Indiana University School of Medicine, Indianapolis, USA
| | - Sehnaz Evrimler
- Department of Radiology, Suleyman Demirel University School of Medicine, Isparta, Tϋrkiye
| | - John M. DeWitt
- Division of Gastroenterology, Indiana University School of Medicine, Indianapolis, USA
| | - Mohammad Al-Haddad
- Division of Gastroenterology and Hepatology, Indiana University School of Medicine, Indianapolis, USA
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20
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Cystic neoplasms of the pancreas; findings on magnetic resonance imaging with pathological, surgical, and clinical correlation. ACTA ACUST UNITED AC 2015; 39:1088-101. [PMID: 24718661 DOI: 10.1007/s00261-014-0138-5] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Pancreatic cysts are increasingly being identified by cross-sectional imaging studies. Pancreatic cystic lesions comprise a spectrum of underlying pathologies ranging from benign and pre-malignant lesions to frank malignancies. Magnetic resonance imaging with cholangiopancreatography is a non-invasive imaging modality used for the characterization of cystic pancreatic lesions. This article will review the most common pancreatic cystic neoplasms and the utility of MR imaging in the characterization of these cysts.
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21
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Martin J, Roberts KJ, Sheridan M, Falk GA, Joyce D, Walsh RM, Smith AM, Morris-Stiff G. Lymphoepithelial cysts of the pancreas:a management dilemma. Hepatobiliary Pancreat Dis Int 2014; 13:539-44. [PMID: 25308365 DOI: 10.1016/s1499-3872(14)60265-4] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Pancreatic lymphoepithelial cysts (LECs) are rare, benign lesions that are typically unexpected post-operative pathological findings. We aimed to review clinical, radiological and pathological features of LECs that may allow their pre-operative diagnosis. Histopathology databases of two large pancreatic units were searched to identify LECs and notes reviewed to determine patient demographic details, mode of presentation, investigations, treatment and outcome. Five male and one female patients were identified. Their median age was 60 years. Lesions were identified on computed tomography performed for abdominal pain in two patients, and were incidentally observed in four patients. Five LECs were located in the tail and one in the body of the pancreas, with a median cyst size of 5 cm. Obtaining cyst fluid was difficult and a largely acellular aspirate was yielded. The pre-operative diagnosis was mucinous cystic neoplasm in all patients. This series of patients were treated distal pancreatectomy and splenectomy. A retrospective review of radiological examinations suggested that LECs have a relatively low signal on T2 imaging and a high signal intensity on T1 weighted images. LECs appear more common in elderly males, and are typically incidental, large, unilocular cysts. Close attention to signal intensity on MRI may allow pre-operative diagnosis of these lesions.
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Affiliation(s)
- Julie Martin
- Departments of Pancreatic Surgery, St James's University Hospital, Leeds, UK.
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22
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Kubo T, Takeshita T, Shimono T, Hashimoto S, Miki Y. Squamous-lined cyst of the pancreas: Radiological-pathological correlation. Clin Radiol 2014; 69:880-6. [PMID: 24837699 DOI: 10.1016/j.crad.2014.03.014] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2013] [Revised: 03/13/2014] [Accepted: 03/20/2014] [Indexed: 02/06/2023]
Abstract
Pancreatic cystic lesions are increasingly being detected incidentally because of the increased use of cross-sectional imaging. Squamous-lined cysts of the pancreas (lymphoepithelial cyst, epidermoid cyst, and dermoid cyst) are rare cystic lesions lined with squamous epithelium. Distinguishing squamous-lined cysts from other cystic lesions of the pancreas is important to avoid unnecessary surgery, because squamous-lined cysts of the pancreas have no malignant potential. The purpose of this review is to describe findings on computed tomography and magnetic resonance imaging and the histopathological characteristics of squamous-lined cysts, and to summarize the key points of differential diagnosis for pancreatic cystic lesions.
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Affiliation(s)
- T Kubo
- Department of Radiology, Graduate School of Medicine, Osaka City University, Japan.
| | - T Takeshita
- Department of Radiology, Graduate School of Medicine, Osaka City University, Japan
| | - T Shimono
- Department of Radiology, Graduate School of Medicine, Osaka City University, Japan
| | | | - Y Miki
- Department of Radiology, Graduate School of Medicine, Osaka City University, Japan
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