title: Atypical parasitic ischiopagus conjoined twins.
abstract: Occurrence of asymmetrical or parasitic conjoined twins (CT) is rare, and currently they are classified analogically to the common unions of symmetrical CT. The authors report on an infant with a parasitic third limb attached to the left lateral aspect of the autosite trunk, in whom male gonadal tissue was found histologically. Parasite parts included complete left lower limb, hemipelvis, lumbosacral vertebral column, spinal cord, and one kidney with ureter and adrenal gland. Autosite anomalies comprised a small left diaphragmatic defect, omphalocele, exstrophy of cloaca, and lumbar meningomyelocele. The authors considered this case to be a rare atypical parasitic ischiopagus CT. The differential diagnosis of the type of twining and other entities with caudal duplications is analyzed briefly.
authors.affiliation: Laboratorio de Genética Humana y Clínica de Asesoramiento Genético, Departamento de Fisiología, Centro Universitario de Ciencias de la Salud, Universidad de Guadalajara, Guadalajara, Jal., México.
authors.forename: J Román
authors.initials: JR
authors.lastname: Corona-Rivera
authors.forename: Enrique
authors.initials: E
authors.lastname: Corona-Rivera
authors.forename: Ramón
authors.initials: R
authors.lastname: Franco-Topete
authors.forename: Jorge
authors.initials: J
authors.lastname: Acosta-León
authors.forename: Virginia
authors.initials: V
authors.lastname: Aguila-Dueñas
authors.forename: Alfredo
authors.initials: A
authors.lastname: Corona-Rivera
mesh_terms: D017809:Fatal Outcome; D006801:Humans; D007231:Infant, Newborn; D007866:Leg / Q000002:abnormalities*; D008159:Lumbar Vertebrae / Q000002:abnormalities* / Q000000981:diagnostic imaging; D008297:Male; D010388:Pelvis / Q000002:abnormalities; D011859:Radiography; D014428:Twins, Conjoined / Q000473:pathology*