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Numerous anatomical variants are described around the knee, many of which look like bony lesions, so it is important to know them to avoid unnecessary complementary tests and inadequate management. Likewise, several alterations in relation to normal development can also simulate bone lesions. However, numerous pathologic processes frequently affect the knee, including traumatic, inflammatory, infectious, and tumor pathology. Many of these entities show typical radiologic features that facilitate their diagnosis. In other cases, a correct differential diagnosis is necessary for proper clinical management. Despite the availability of increasingly advanced imaging techniques, plain radiography is still the technique of choice in the initial study of many of these pathologies. This article reviews the radiologic characteristics of tumor and nontumor lesions that may appear around the knee to make a correct diagnosis and avoid unnecessary complementary radiologic examinations and inadequate clinical management. [ABSTRACT FROM AUTHOR]

The second part of the Guidelines and Recommendations for Musculoskeletal Ultrasound (MSUS), produced under the auspices of EFSUMB, following the same methodology as for Part 1, provides information and recommendations on the use of this imaging modality for joint pathology, pediatric applications, and musculoskeletal ultrasound-guided procedures. Clinical application, practical points, limitations, and artifacts are described and discussed for every joint or procedure. The document is intended to guide clinical users in their daily practice., Competing Interests: Fernando Alfageme Speaker honoraria: GE, Mindray; Equipment support: EsaoteDavid Bong No Conflicts of interestAngel Bueno No Conflicts of interestVito Cantisani Speaker honoraria: Bracco, Samsung, CanonPaz Collado No Conflicts of interestMaria Antonietta D'Agostino No Conflicts of interestDaniela Fodor No Conflicts of interestJavier de la Fuente No Conflicts of interestWolfgang Hartung Speaker honoraria: Abbvie, GE Healthcare, Alpinion Medical; Ultrasound equipment support; Alpinion Medical Germany, Canon Medical GermanyHilde Hammer Speake honoraria and/or consultancy; AbbVie, Lilly, Roche, NovartisAndrea Klauser No Conflicts of interestJens Kessler No Conflicts of interestManuela Lenghel No Conflicts of interestCarlo Martinoli Speaker honoraria and equipment support: Philips, CanonDolores Mendoza-Cembranos No Conflicts of interestMihaela Micu No Conflicts of interestIngrid Möller No Conflicts of interestAurelie Najm No Conflicts of interestGabriella Iohom No Conflicts of interestClara Malattia No Conflicts of interestPeter Mandl No Conflicts of interestEsperanza Naredo No Conflicts of interestLevent Ozcakar No Conflicts of interestRiccardo Picasso No Conflicts of interestAthena Plagou Speaker honoraria: GESebastian C Rodriguez-Garcia No Conflicts of interestXavier Sala-Blanch No Conflicts of interestLuca Scofienza Non-financial support: Samsung Imaging, Abiogen, Bracco Imaging Italia; Speaker honoraria: Esaote SPA, Abiogen, Biolive, Fidia Pharma Group, Novartis, PfizerOana Serban No Conflicts of interestPaolo Simoni No Conflicts of interestIwona Sudoł-Szopińska No Conflicts of interestLene Terslev Speaker honoraria: GEChristian Tesch No Conflicts of interestPlamen Todorov No Conflicts of interestJacqueline Uson No Conflicts of interestVioleta Vlad No Conflicts of interestFederico Zaottini No Conflicts of interestMichael Pelea, Diana Bilous, Anamaria Marian, Roxana Gutiu No conflict of interest., (Thieme. All rights reserved.)

The first part of the guidelines and recommendations for musculoskeletal ultrasound, produced under the auspices of the European Federation of Societies for Ultrasound in Medicine and Biology (EFSUMB), provides information about the use of musculoskeletal ultrasound for assessing extraarticular structures (muscles, tendons, entheses, ligaments, bones, bursae, fasciae, nerves, skin, subcutaneous tissues, and nails) and their pathologies. Clinical applications, practical points, limitations, and artifacts are described and discussed for every structure. After an extensive literature review, the recommendations have been developed according to the Oxford Centre for Evidence-based Medicine and GRADE criteria and the consensus level was established through a Delphi process. The document is intended to guide clinical users in their daily practice., Competing Interests: Fernando Alfageme: Speaker honoraria: GE, Mindray; Equipment support: EsaoteDavid Bong: No Conflicts of interestAngel Bueno: No Conflicts of interestVito Cantisani: Speaker honoraria: Bracco, Samsung, CanonPaz Collado: No Conflicts of interestMaria Antonietta D’Agostino: No Conflicts of interestDaniela Fodor: No Conflicts of interestJavier de la Fuente: No Conflicts of interestWolfgang Hartung: Speaker honoraria: Abbvie, GE Healthcare, Alpinion Medical; Ultrasound equipment support; Alpinion Medical Germany, Canon Medical GermanyHilde Hammer: Speake honoraria and/or consultancy; AbbVie, Lilly, Roche, NovartisAndrea Klauser: No Conflicts of interestJens Kessler: No Conflicts of interestManuela Lenghel: No Conflicts of interestCarlo Martinoli: Speaker honoraria and equipment support: Philips, CanonDolores Mendoza-Cembranos: No Conflicts of interestMihaela Micu: No Conflicts of interestIngrid Möller: No Conflicts of interestAurelie Najm: No Conflicts of interestGabriella Iohom: No Conflicts of interestClara Malattia: No Conflicts of interestPeter Mandl: No Conflicts of interestEsperanza Naredo: No Conflicts of interestLevent Ozcakar: No Conflicts of interestRiccardo Picasso: No Conflicts of interestAthena Plagou: Speaker honoraria: GESebastian C Rodriguez-Garcia: No Conflicts of interestXavier Sala-Blanch: No Conflicts of interestLuca Scofienza: Non-financial support: Samsung Imaging, Abiogen, Bracco Imaging Italia; Speaker honoraria: Esaote SPA, Abiogen, Biolive, Fidia Pharma Group, Novartis, PfizerOana Serban: No Conflicts of interestPaolo Simoni: No Conflicts of interestIwona Sudoł-Szopińska: No Conflicts of interestLene Terslev: Speaker honoraria: GEChristian Tesch: No Conflicts of interestPlamen Todorov: No Conflicts of interestJacqueline Uson: No Conflicts of interestVioleta Vlad: No Conflicts of interestFederico Zaottini: No Conflicts of interestMichael Pelea, Diana Bilous, Anamaria Marian, Roxana Gutiu: No conflict of interest, (Thieme. All rights reserved.)