caa a22 4500 605493359 CHVBK 20210128100520.0 cr unu---uuuuu 210128e20151001xx s 000 0 eng 10.1007/s00261-015-0465-1 doi (NATIONALLICENCE)springer-10.1007/s00261-015-0465-1 The shading sign: is it exclusive of endometriomas? [Elektronische Daten] [João Lopes Dias, Filipe Veloso Gomes, Rita Lucas, Teresa Cunha] Objectives: To investigate if the shading sign is an exclusive MRI feature of endometriomas or endometrioid tumors, and to analyze its different patterns. Methods: Three hundred and fourty six women with adnexal masses who underwent 1.5/3-T MRI were included in this retrospective, board-approved study. The shading sign was found in 56 patients, but five cases were excluded due to lack of imaging follow-up or histological correlation. The final sample included 51 women. The type of tumor and the pattern of shading were recorded for each case. Results: Thirty endometriomas and five endometrioid carcinomas were found. The remaining 16 cases corresponded to other benign and malignant tumors. The overall sensitivity, specificity, positive predictive value, and negative predictive value were 73%, 93%, 59%, and 96%, respectively. Restricting the analysis to cystic lesions without solid or fat component, sensitivity, specificity, positive predictive value, and negative predictive value were 73%, 96%, 94%, and 80%. Five shading patterns were identified: layering (15.7%), liquid-liquid level (11.8%), homogenous (45.1%), heterogeneous (11.8%), and focal/multifocal shading within a complex mass (19.6%). No significant correlation was found between these patterns and the type of tumor. Conclusions: The shading sign is not exclusive of endometriomas or endometrioid tumors. Homogenous shading was the most prevalent pattern in endometriomas and half of the cases with focal/multifocal shading within a complex mass were endometrioid carcinomas. Springer Science+Business Media New York, 2015 Endometrioma nationallicence Endometrioid carcinoma nationallicence Magnetic resonance imaging nationallicence Gynecology nationallicence Imaging nationallicence Lopes Dias João Department of Radiology, Hospital de S. José, Centro Hospitalar de Lisboa Central, Rua José António Serrano, 1150-199, Lisbon, Portugal aut Veloso Gomes Filipe Department of Radiology, Centro Hospitalar do Algarve, Rua Leão Penedo, 8000-386, Faro, Portugal aut Lucas Rita Department of Radiology, Hospital de St. António dos Capuchos, Centro Hospitalar de Lisboa Central, Alameda de Santo António dos Capuchos, 1169-050, Lisbon, Portugal aut Cunha Teresa Department of Radiology, Instituto Português de Oncologia de Lisboa Francisco Gentil, Rua Professor Lima Basto, 1099-023, Lisbon, Portugal aut Abdominal Imaging Springer US; http://www.springer-ny.com 40/7(2015-10-01), 2566-2572 0942-8925 40:7<2566 2015 40 261 https://doi.org/10.1007/s00261-015-0465-1 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00261-015-0465-1 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Lopes Dias João Department of Radiology, Hospital de S. José, Centro Hospitalar de Lisboa Central, Rua José António Serrano, 1150-199, Lisbon, Portugal aut NATIONALLICENCE 700 1- Veloso Gomes Filipe Department of Radiology, Centro Hospitalar do Algarve, Rua Leão Penedo, 8000-386, Faro, Portugal aut NATIONALLICENCE 700 1- Lucas Rita Department of Radiology, Hospital de St. António dos Capuchos, Centro Hospitalar de Lisboa Central, Alameda de Santo António dos Capuchos, 1169-050, Lisbon, Portugal aut NATIONALLICENCE 700 1- Cunha Teresa Department of Radiology, Instituto Português de Oncologia de Lisboa Francisco Gentil, Rua Professor Lima Basto, 1099-023, Lisbon, Portugal aut NATIONALLICENCE 773 0- Abdominal Imaging Springer US; http://www.springer-ny.com 40/7(2015-10-01), 2566-2572 0942-8925 40:7<2566 2015 40 261