title: Umbilical Nodule with Cyclical Bleeding: A Case Report and Literature Review of Atypical Endometriosis.
abstract: Endometriosis is defined as the presence of endometrial glands and stroma outside the uterus. It affects 3 to 10 percent of women of reproductive age. Umbilical endometriosis is rare, with an estimated incidence of 0.5-1.0% among all cases of endometriosis, and is usually secondary to prior laparoscopic surgery involving the umbilicus. In this report, we described a case of umbilical endometriosis treated with surgical resection and highlight the great importance of medical history compared to complementary diagnostic tests that can be sometimes inconclusive.
authors.affiliation: Centro Hospitalar de Trás-Os-Montes e Alto Douro, Unidade de Vila Real, Avenida Noruega, 5000-508 Vila Real, Portugal.
authors.forename: Marlene Teixeira
authors.identifier: 0000-0001-9669-8084
authors.initials: MT
authors.lastname: Andrade
authors.affiliation: Hospital Dr. Nélio Mendonça, Hospital Central do Funchal, Avenida Luís de Camões, Funchal, 9004-514 Madeira Island, Portugal.
authors.forename: Cláudia V Marques
authors.initials: CV
authors.lastname: de Freitas
authors.affiliation: Hospital Dr. Nélio Mendonça, Hospital Central do Funchal, Avenida Luís de Camões, Funchal, 9004-514 Madeira Island, Portugal.
authors.forename: Sara Filipa Camacho
authors.initials: SF
authors.lastname: Câmara
authors.affiliation: Hospital Dr. Nélio Mendonça, Hospital Central do Funchal, Avenida Luís de Camões, Funchal, 9004-514 Madeira Island, Portugal.
authors.forename: José Joaquim Nunes
authors.initials: JJ
authors.lastname: Vieira