title: Incidental benign metastasizing leiomyoma in a patient with bone sarcoma: a case report.
abstract: Background. The benign metastasizing leiomyoma is an exceptionally rare entity; it presents with ectopic leiomyoma nodules with a benign pattern. Symptoms vary according to the anatomic location. The diagnosis is histopathological, usually in patients with history of hysterectomy. Case Presentation. A 36-year-old female with 2-month history of left knee pain was diagnosed with bone fibrosarcoma. A CT scan showed pulmonary nodules. The patient started neoadjuvant chemotherapy. Conservative surgery of pelvic limb was achieved. A new CT scan reported pulmonary nodules that remained in relation to the previous CT. A nodule resection by thoracotomy and TOB (transoperative biopsy) was performed. The final pathology report described benign proliferative lesions consistent with benign metastatic leiomyoma. Conclusions. Benign metastatic leiomyoma is a rare condition presenting with uterine and extrauterine nodules most commonly in the lung. The diagnosis is histopathological. The surgical procedure must be reserved for selected patients.
authors.affiliation: Escuela de Medicina y Ciencias de la Salud del Tecnológico de Monterrey-TEC Salud, Avenida Doctor Ignacio Morones Prieto 3000, Colonia Los Doctores, 64710 Monterrey, NL, Mexico.
authors.forename: Zanndor Jacob
authors.initials: ZJ
authors.lastname: Del Real-Romo
authors.affiliation: Hospital San José-TEC Salud, Avenida Doctor Ignacio Morones Prieto 3000, Colonia Los Doctores, 64710 Monterrey, NL, Mexico ; Universidad Autónoma de Nuevo León, Avenida Francisco I. Madero y Avenida Gonzalitos S/N, Colonia Mitras Centro, 64460 Monterrey, NL, Mexico.
authors.forename: Carlos
authors.initials: C
authors.lastname: Montero-Cantú
authors.affiliation: Hospital San José-TEC Salud, Avenida Doctor Ignacio Morones Prieto 3000, Colonia Los Doctores, 64710 Monterrey, NL, Mexico.
authors.forename: Oscar
authors.initials: O
authors.lastname: Villegas-Cabello
authors.affiliation: Hospital San José-TEC Salud, Avenida Doctor Ignacio Morones Prieto 3000, Colonia Los Doctores, 64710 Monterrey, NL, Mexico ; Hospital Zambrano Hellion-TEC Salud, Batallón San Patricio 112, Colonia Real de San Agustin, 66278 San Pedro Garza García, NL, Mexico.
authors.forename: José Antonio
authors.initials: JA
authors.lastname: Díaz-Elizondo
authors.affiliation: Escuela de Medicina y Ciencias de la Salud del Tecnológico de Monterrey-TEC Salud, Avenida Doctor Ignacio Morones Prieto 3000, Colonia Los Doctores, 64710 Monterrey, NL, Mexico.
authors.forename: Danae
authors.initials: D
authors.lastname: Reyes-Salas
authors.affiliation: Escuela de Medicina y Ciencias de la Salud del Tecnológico de Monterrey-TEC Salud, Avenida Doctor Ignacio Morones Prieto 3000, Colonia Los Doctores, 64710 Monterrey, NL, Mexico.
authors.forename: Rene
authors.initials: R
authors.lastname: Palomo-Hoil
authors.affiliation: Escuela de Medicina y Ciencias de la Salud del Tecnológico de Monterrey-TEC Salud, Avenida Doctor Ignacio Morones Prieto 3000, Colonia Los Doctores, 64710 Monterrey, NL, Mexico.
authors.forename: Guillermo
authors.initials: G
authors.lastname: Peralta-Castillo
authors.affiliation: Escuela de Medicina y Ciencias de la Salud del Tecnológico de Monterrey-TEC Salud, Avenida Doctor Ignacio Morones Prieto 3000, Colonia Los Doctores, 64710 Monterrey, NL, Mexico.
authors.forename: David
authors.initials: D
authors.lastname: Martínez-Sánchez
authors.affiliation: Hospital San José-TEC Salud, Avenida Doctor Ignacio Morones Prieto 3000, Colonia Los Doctores, 64710 Monterrey, NL, Mexico ; Hospital Zambrano Hellion-TEC Salud, Batallón San Patricio 112, Colonia Real de San Agustin, 66278 San Pedro Garza García, NL, Mexico.
authors.forename: Eduardo
authors.initials: E
authors.lastname: Flores-Villalba