Conjoined twins developmental malformations and clinical implications

Uno de nosotros | Alice Dumorat DregerConjoined white-tailed deer fawnsConjoined Twins | The Embryo Project Encyclopedia Conjoined twins, also known as Siamese twins after the famous Chang and Eng brothers, are identical twins whose bodies are joined during embryological development. A rare disorder, conjoined twins are believed to be born 1 in every 50000 to 200000 births with …Malformations rich aspect of mythology ( 6500 BC – Turkey - figurine of conjoined twins 4000-5000 BC – Australia drawings of twins 2000 BC - Tablet of Nineveh – describes 62 malformations and predicts the future Ancient AwarenessFuck Yeah Conjoined Twins.Dicefalia em Bovino - UFRGSNewborn Surgery / Edition 4 by Prem Puri | 9781482247701 Conjoined twins are identical or monozygotic twins whose bodies are joined in utero. Pygopagus or Iliopagus twins are a type of conjoined twins in which two bodies joined back to back at the buttocks. Surgical Separation of conjoined twins is extremely risk of death and life threatening. Female pygopagus twins of three months were been operated and separated at Kigali Teaching University Hospital.Clinical Research - Montefiore Medical CenterMultiple pregnancies in mithology, history and fine arts Asymmetric Omphalopagus in a Triplet after In Vitro Conjoined Fawns - Deer Research Lab at University of GeorgiaVatican Hospital Separates Conjoined Twins In Rare Surgery Conjoined Twins: Developmental Malformations And Clinical Separation Of Conjoined Twins Presents Surgical And Conjoined Twins: Developmental Malformations and Clinical Dr. Rowena Spencer’s 2003 book Conjoined Twins: Developmental Malformations and Clinical Implications discusses several cases of supposed conjoined triplets and quadruplets, most of which consist of one autosite with a number of parasites or acardiac twins. However, a 2004 article in The American Journal of Obstetrics and Gynecology describes a case of parapagus dicephalus dibrachius …Fetal syringomyelia | Acta Neuropathologica Communications V: Conjoined and Acardiac Twins. (2003). Conjoined twins, developmental malformations and clinical implications. (1993). Conjoined twins: implications for blastogenesis. (1992). Conjoined twins: theoretical embryologic basis. (1988). Cross-sectional illustration on major types of conjoined twins…To develop mechanisms to enlarge short segments of esophagus and intestine. The translational implications of Dr. Fishmans work: Vascular malformations can often be controlled or nearly obliterated with intravascular sclerotherapy or embolization of the luminal spaces. However, recanalization and clinical recurrence are commonplace.Try our live chat or give us a call. Well be happy to answer your queries Monday through Friday, from 9am to 5pm, Philippine Standard Time. DOST - Philippine Council for Health Research and Development 3rd Flr DOST Main Building, Gen. Santos Ave., Bicutan Taguig City, 1631, Philippines +63 2 837 7534Conjoined twins are rare in Cervidae, but more commonly reported in humans and domestic the primitive streak stage of development (Kaufman 2004). Although conjoined twins are Spencer R. 2003. Conjoined twins: developmental malformations and clinical implications. Johns Hopkins University Press, Baltimore, Maryland, 476 pp. Figure 1 AR.MP.129 Fetal Surgery in Utero for Prenatally Diagnosed Oct 12, 2015Jun 21, 2017Perinatal Problems in Multiple Births (24.09.2010)Original Article Clinical characteristics and risk factors Tippi Mackenzie | Profiles RNSConjoined twins - UCLouvainNewborn Surgery - 4th Edition - Prem Puri - Routledge BookThe prevalence of conjoined twins globally is 1 in 50,000 to 1 in 100,000 births [1, 3]. The incidence of dicephalus dipus dibrachius twins is much less than those of conjoined twins and has not been documented so far. Conjoined twins occur due to incomplete division of the embryonic disc at or after 13 days post-conception [1, 2].Lucio Godina (March 8, 1908 – November 24, 1936) and Simplicio Godina (March 8, 1908 - December 8, 1936) were pygopagus conjoined twins from the island of Samar in the Philippines.. At the age of 21 they married Natividad and Victorina Matos, who were identical twins.They performed in various sideshow acts, including in an orchestra on Coney Island and in dance with their wives.Among the most dramatic malformations of the body and central nervous system (CNS) are those that involve abnormal lateral separation of the neural tube along its long axis. Often referred to as “monsters” in the old literature, these include the spectra of conjoined (or conjoint) twinning and holoprosencephaly.Research Article A Pair of Craniopagus Twins (O’ Connell Oct 08, 2015Food Safety & Toxicology (II)Rowena Spencer (Editor) Conjoined twins. Developmental About 3% of all conceptions are associated with major congenital malformations, many of them are lethal developmental defect and genetic in origin or teratogenic (adverse effects of the environment during gametogenesis or early embryogenesis). Genetics with or without adverse environment has role in virtually every developmental defect/malformation disorders in causation, predisposition James T. Goodrich, MD, PhD, 1946–2020: a historical Etiology and clinical presentation of birth defects Successful surgical separation of conjoined twins: First Conjoined Twins: Developmental Malformations And Clinical Jun 30, 2017Xipho-Omphalopagus Conjoined Twins in a Spontaneous Congenital Malformations Of The Central Nervous System And Thoracic heteropagus twins with an omphalocele | Journal The proportion of associated malformations unrelated to the site of union of conjoined twins has been reported in other studies 44) and was similar to the 63% observed in the present study. However, only two studies 45) , 46) stratified the associated malformations according to the conjoined twins type.Mohammed Zamakhshary - Chairman - Advanced Saudi Health Jun 12, 2020Letters to the Editor - WileyAmong the most dramatic malformations of the body and central nervous system (CNS) are those that involve abnormal lateral separation of the neural tube along its long axis. Often referred to as “monsters” in the old literature, these include the spectra of conjoined (or conjoint) twinning and holoprosencephaly.Conjoined twins: developmental malformations and clinical implications. Baltimore: Johns Hopkins University Press. Baltimore: Johns Hopkins University Press. ISBN 0-8018-7070-4 .Enhanced neuro-ophthalmologic evaluation to support Monozygotic twins: Ten reasons to be different Section 5 – Malformations | Obgyn KeySTATdx - Twin Reversed Arterial PerfusionJun 17, 2017James LS, James TG (2006) The craniopagus malformation: classification and implications for surgical separation. Brain 129(5): 1084-1095. Edmonds LD, Layde PM (1982) Conjoined twins in the United States, 1970- 1977. Teratology 25(3): 301-308. Rudolph AJ, Michaels JP, Nichol BL (1967) Obstetric management of conjoined twins. Birth Defects 3: 1-28.Cephalothoracoomphalopagus: A noninvasive study Patra A Lucio and Simplicio Godina - WikipediaDisorders of Early Midline Patterning (Chapter 38 Cureus | Situs Inversus Totalis in Association With Conjoined twins: whose best interest should prevail? An Conjoined Twins: Developmental Malformations And Clinical Implications Rowena Spencer, The Modern Genesis : Being An Inquiry Into The Credibility Of The Nebular Theory, Of The Origin Of Planetary Bodies, The Structure Of The Solar System, And Of General Cosmical History W B. 1822-1879 Slaughter, The Works Of William Makepeace Thackeray (Volume 23) William Makepeace Thackeray, Civil Aircraft Cephalothoracopagus Janiceps Malformation: A Contribution Oct 31, 2017Conjoined Twins [1]177Lutetium: "theranostic twins" for diagnosis and Two Is a Crowd: Two Is a Crowd: On the Enigmatic 1997. Medicine. Overview. Overview. Tippi MacKenzie is a pediatric and fetal surgeon who is focused on developing better ways to diagnose and treat genetic diseases before birth. She leads a translational research lab examining the unique biology between the mother and her fetus, with the idea that pregnancy complications such as preterm labor Conjoined Twins Clinical Presentation: History and INTRODUCTION. Twin pregnancy is associated with higher rates of almost every potential complication of singleton pregnancy, with the exceptions of postterm pregnancy and macrosomia. The most serious risk is preterm delivery, which accounts for most of the increased perinatal mortality, neonatal morbidity, and long-term morbidity of twins.Abnormal Development - Twinning - EmbryologyFind many great new & used options and get the best deals for CLINICAL EMBRYOLOGY: AN ATLAS OF CONGENITAL MALFORMATIONS By Robert NEW at the best online prices at …funded clinical trial focusing on the care management of twin-twin transfusion syndrome. Dr. Crombleholme was Implications for public policy and the development of race-based strategies for in the separation of omphalopagus conjoined twins. Pediatr Surg Int. 2007; 23: 923-6.NURS 444 Ch. 3, 5, 6 Infertility Contraception Abortion Dec 09, 2014General and Thoracic Surgery - Cincinnati ChildrensThe natural history of prenatally diagnosed conjoined twins. J Pediatr Surg 37(3):303-9, 2002 ; Samadi DS, Jacobs IN, Walsh D, Bouchard S, Herlyn M, Crombleholme TM: Adenovirus-mediated ex vivo gene transfer of human vascular endothelial growth factor in a rabbit laryngotracheal reconstruction model. Ann Otol Rhinol Laryngol 111(4):295-301, 2002malformations). 4) Reversed cerebral asymmetry is associated with breast cancer. 5) In hermaphrodites with only 1 cell line, ovaries are on the left and testes are on the right. Clinical …Screening, Management and Delivery in Twin PregnancyConjoined twins represent one of the rarest forms of twin gestation. They occur in roughly 1 in every 200 identical twin pregnancies and are always identical. The incidence ranges from 1 in 50 000 to 1 in 100 000 live births [1]. Because this situation carries high risk, early diagnosis and management of delivery is extremely important.Disorders of Early Midline Patterning (Chapter 38 Conjoined Twins: Developmental Malformations and Clinical Implications 1st Edition by Rowena Spencer MD (Author) 4.5 out of 5 stars 2 ratings. ISBN-13: 978-0801870705. ISBN-10: 0801870704. Why is ISBN important? ISBN. This bar-code number lets you verify that youre getting exactly the right version or edition of a book. The 13-digit and 10 Conjoined Twins: Developmental Malformations And Clinical Congenital anomalies occur more frequently in MZ twins (prevalence 5 times higher than in the general population) and may be concordant or discordant. 1 Some malformations, such as conjoined and acardiac twins, as well as fetus papyraceous, are related in some way to the twinning process itself. 34 Malformations, including cloacal anomalies May 30, 2017Conjoined twins: developmental malformations and clinical implications. Johns Hopkins University Press, Baltimore, Maryland. 476p. Google ScholarNormal and Abnormal Embryonic Development in Virtual RealityResearch papers on Clinical medicine from CyberLeninka Monocephalus dipygus parapagus: A suspected case of Acta Genet Med Gemellol (Roma)Conjoined Twins: Developmental Malformations And Clinical conjoined twins: part I: embryogenesis. Clinical Anatomy 13: 36-53. Spencer R (2000b). Theoretical and analytical embryology of conjoined twins: part II: adjustments to union. Clinical Anatomy 13: 97-120. Spencer R (2003). Conjoined Twins: Developmental MalformationsBook review, Birth Defects Research Part A | 10.1002/bdra Program Director, Clinical Investigator Program, KAIMRC, King Saud bin Abdulaziz University for Health Sciences, KAMC, Riyadh, KSA Kingdom of Humanity team for conjoined twins separation. Hepatobiliary anomalies in conjoined twins Laparoscopic-Assisted anorectal pull-through for anorectal malformations: a systematic review and the need Apr 19, 2019Start studying NURS 444 Ch. 3, 5, 6 Infertility Contraception Abortion Genetics Conception and Fetal Development. Learn vocabulary, terms, and more with flashcards, games, and other study tools.Embryonic Left-Right Asymmetry - MITISUOG Practice Guidelines: role of ultrasound in twin Disorders of Early Midline Patterning (Chapter 38 Challenges of congenital malformations: an African PDF Conjoined Twins Developmental Malformations and Research papers on Clinical medicine from CyberLeninka 200,000 live births [1]. A rarer form of conjoined twin-ning is the dicephalus parapagus twins discordant for anencephaly in which the laterally united babies have two heads in one trunk. One of the twins has no cra-nium or brain tissue, but both have upper limbs and two lower limbs. Whereas the incidence of conjoinedCLINICAL EMBRYOLOGY: AN ATLAS OF CONGENITAL MALFORMATIONS …Dr. Cass serves as Director of Fetal Surgery and Director, Fetal Care Center at the Cleveland Clinic in Cleveland, OH. He was former faculty in the Departments of Surgery, Pediatrics, and Obstetrics and Gynecology at Baylor College of Medicine in Houston, Texas. He was Co-Founder of the Texas Childrens Fetal Center in 2001; one of only 3 Aug 07, 2021CHAPTER 11 – Conjoined Triplets and Beyond; Unusual Twins; also Caudal Duplication, Dimelia, and Viviparity versus Oviparity CHAPTER 12 – Parasitic Conjoined Twins, Fetuses in fetu, Acardiac Twins, and Teratomas References IndexMar 10, 2021Sep 01, 2002A notable example is the statue of the conjoined twins, the goddess of Antolia, dating back to 6500 BC, which was discovered in southern Turkey in 1962 13. Etiological factors proposed for congenital malformations have varied in history based on prevailing understanding, culture, and religion.Apr 01, 2018David W. Low, MD, is an attending surgeon in the Division of Plastic and Reconstructive Surgery and the director of the International Visiting Scholar program in plastic surgery at Childrens Hospital of Philadelphia. Areas of Expertise: Cleft lip and palate, Hemangiomas, Laser and microsurgery, Vascular malformations, Reconstructive and Craniopagus twins are conjoined twins who are fused at the cranium. This condition occurs in about 10-20 babies in every million births in the United States. Among this small group, cephalic conjoining, or craniopagus twinning, represents the rarest of congenital abnormalities only accounting for 2-6% of all conjoined twins.Jun 06, 2003Anna Pierini - Coordinator of the Epidemiology and Health Developed by renowned radiologists in each specialty, STATdx provides comprehensive decision support you can rely on - Twin Reversed Arterial PerfusionConjoined White-Tailed Deer (Odocoileus virginianus) FawnsSignificantly better mortality for total craniopagus twins in multistaged surgical separation versus single-staged separation The craniopagus malformation: Classification and implications for surgical separation. Stone J, Goodrich J. 2006. Craniopagus twins: Clinical and surgical management Craniopagus twins: Clinical and surgical management.Jul 22, 2021Growth in upper centiles, Marfanoid skeletal habitus, distinctive facialdefects, VSD, dextrocardia), central nervous system (hydrocephalus, anencephaly . DOWNLOAD NOW » Author: Roger E. Stevenson. Publisher: Oxford University Press ISBN: 9780199386031 Category: Medical Page: 978 View: 567 The central theme of this text is to provide information on individual anomalies et to connect Thoracopagus Conjoined Twins: A Case ReportJul 04, 2018Sherri Foster | Washington College - Academia.eduClinical Implications of Basic Neuroscience; The faces and CNSs showed asymmetry of development manifested chiefly in the prosencephalon, specifically the cortical gyri, corpus callosum, and subependymal mantle layer. It is difficult to explain discordance for congenital malformations in monovular or conjoined twins by either genetic or Bioethical issues in caring for conjoined twins and their Conjoined Twins | Johns Hopkins University Press BooksThe chapter closes with a series of discussions on the pathology of twins as it affects the heart: twin–twin transfusion syndrome, conjoined twins and acardiac twins. Hoefsloot, LH et al. CHD7 mutations and CHARGE syndrome: the clinical implications of an expanding Developmental Malformations and Clinical Implications. Baltimore Conjoined twins are very rare, unique anomalies of monozygotic twinning. They develop from an incompletely divided embryonic disc after formation of the disk and primitive amniotic sac. Ultrasonography has made prenatal diagnosis of conjoined twins possible.Nov 28, 2010Multifetal pregnancy | Nurse KeyJournal of Postgraduate Gynecology & Obstetrics: November 2014[11] Spencer R. Conjoined twins. Developmental malformations and clinical impli-cations. Baltimore, London: John Hopkins University Press; 2003. [12] Taruffi C. Storia della Teratologia. Parte Seconda. Bologna: Regio Tipografia; 1882. [13] Khanna PC, Pungavkar SA, Patkar DP. Ultrafast Magnetic Resonance imaging of cephalothoracopagus Janiceps Feb 04, 20152003, Rowena Spencer, Conjoined Twins: Developmental Malformations and Clinical Implications, Johns Hopkins University Press, pages 193–194, The males may have penoscrotal transposition, two scrotums surrounding a single penis with one or two glandes and/or urethras and/or multiple corpora cavernosa. Anagrams . dangles, gelands, gladens, slangedResources - Fetal Care Center DallasMar 07, 2003Twinning - The LancetConjoined Siamese Twins Incidence Delivered by Caesarian This theory, which is just beginning to emerge as a logical explanation, states that conjoined twins are the result of stem cells from one twin adhering to stem cells of the other. For a detailed account of the fusion theory, see Conjoined Twins: Developmental Malformations and Clinical Implications by …Nov 01, 2005In this article, we provide a comprehensive overview of multiple facets in the puzzling genesis of symmetrical conjoined twins. The etiopathogenesis of conjoined twins remains matter for ongoing debate and is currently cited-in virtually every paper on conjoined twins-as partial fission or secondary …Sam Taylor - Academia.eduNov 03, 2020The completion of embryonic development depends, in part, on the interplay between genetic factors and environmental conditions, and any alteration during development may affect embryonic genetic and epigenetic regulatory pathways leading to congenital malformations, which are mostly incompatible with life. Oviparous reptiles, such as sea turtles, that produce numerous eggs in a clutch that is The human umbilical cord normally develops with two arteries and one vein. Single umbilical artery is a condition of the umbilical cord in which one artery is missing and the prevalence ranges from 0.2% to 11%, depending on the population studied. 1–5 Numerous maternal and fetal risk factors and characteristics associated with single umbilical artery have been reported, including sex Q34.0-Q34.9 Other Congenital malformations of respiratory system Q60.0-Q64.9 Congenital malformations of the urinary system Q89.4 Conjoined twins Q89.8 Other specified congenital malformations Reviews, Revisions, and Approvals Date Approval Date Policy adopted from HN NMP344 Fetal Surgery in Utero for Prenatally Diagnosed Malformations.Jan 24, 2019Request PDF | On Sep 1, 2003, J. Bruce Beckwith published Conjoined Twins: Developmental Malformations and Clinical Implications | Find, read and cite all the research you need on ResearchGateConjoined Twins Developmental Malformations And Clinical Implications Used $92.83 Ooak Siamese Conjoined Twins Two Headed Care Bears Pastel Goth Creepy Teddy BearDiamniotic conjoined fetuses in a triplet pregnancy: an --multipart-boundary Content-Type: application/pdf Range Dicephalus parapagus conjoined twins discordant for Conjoined Twins: Developmental Malformations and Clinical Ultrasonography, Prenatal Subject Areas on Research Uno de nosotros | Alice Dumorat Dreger1. Introduction - HindawiConjoined Twins: Developmental Malformations and Clinical Apr 24, 2008475.00 Current price is , Original price is $475.0. You. Buy New. $475.00. Buy Used. $330.55. $ 475.00. Ship This Item — Not Eligible for Free Shipping. Unavailable for pickup at B&N Clybourn.Rowena Spencer, Conjoined Twins: Developmental Malformations and Clinical Implications (Balti-more and London, 2003), 7-8. Also, Encyclopaedia medica, vol. 12 (1902), 141. By "public," I mean peoples personal interpretation and accounting of disability at work and in communal spaces.Jul 08, 2020Dr. Elizabeth McPherson, MD | Marshfield, WI | Clinical Conjoined Twin Separation: Lessons Learned | Semantic ScholarOct 01, 2018Twinning has fascinated human beings over the centuries. New technologies and large study groups have led to improved documentation of frequency and complications in twin pregnancies and long-term outcomes. Artificial reproductive technologies have led to a pronounced rise in numbers of dizygotic and monozygotic twins. Although spontaneous dizygotic twinning is clearly associated with Objective: Conjoined twin is a rarely seen congenital anomaly together with severe mortality and morbidity. The more common types of conjoined twins include the thoracopagus type, where the fusion is anterior, at the chest, and involves the heart. We are reporting one case of conjoined twins.This Month in History: Dr. Rowena Spencer and Her Little Introduction. Craniopagus twins (CPT) joined at the head are an uncommon malformation found once in ∼2.5 million live births and represent only 2–6% of conjoined twins (Edmonds and Layde, 1982; Baldwin, 1998; Spencer, 2003; Spitz and Kiely, 2003).Approximately 40% of conjoined twins are stillborn and an additional one-third die within 24 h, usually from congenital organ anomalies, leaving Twin-twin transfusion syndrome (TTTS) is a severe complication of monochorionic (1 placenta) twin pregnancies, characterized by the development of unbalanced chronic blood transfer from one twin, defined as donor twin, to the other, defined as recipient, through placental anastomoses.Can conjoined triplets (or other higher multiples) exist?Dr. Rowena Spencers 2003 book Conjoined Twins: Developmental Malformations and Clinical Implications discusses several cases of supposed conjoined triplets and quadruplets, most of which consist of one autosite with a number of parasites or acardiac twins (see above).De novo congenital malformation frequencies in children Twins conjoined. Medical search. WikipediaTable Of Contents | Johns Hopkins University Press Bookscraniopagus malformation: classification and implications Among the defects are the conjoined twins, a rare congenital anomaly caused by fusion of two and the other had normal prestomachs development, with connection to normal small and large intestines. There was a Conjoined Twins: Developmental malformations and clinical implications. Baltimore: Johns Hopkins University Press, 476p.Craniopagus twins in: Journal of Neurosurgery: Pediatrics Craniopagus twins: surgical anatomy embryology andtheir Diagnostic Ultrasound for Sonographers - 1st EditionBooks on Embryology - Dropbears.comDr. J. Bruce Beckwiths review of Dr. Rowena Spencers Heteropagus conjoined twins (also known as parasitic twins) are defined as the presence of a nonviable and severely impaired fetus (or fetal parts) attached to a relatively normal twin (termed the autosite) in one of the same areas in which intact conjoined twins would be united [6].Conjoined White-Tailed Deer (Odocoileus virginianus) Fawns Ultrasonography, Prenatal | [email protected]/Siamese twins are identical twins whose bodies are joined in utero. A rare phenomenon, the occurrence is estimated to range from 1 in 50,000 births to 1 in 200,000 births, with a somewhat higher incidence in Southwest Asia and Africa. Approximately half are stillborn, and a smaller fraction of pairs born alive have abnormalities incompatible with life.Absence of the spleen(s) in conjoined twins: a - COREMonochorionic Twin Pregnancy— Potential Risks and Oct 05, 2005N. Scott Adzick, MD, MMM, FACS, FAAP, is Surgeon-in-Chief of Childrens Hospital of Philadelphia and the founder and Director of the Center for Fetal Diagnosis and Treatment. Areas of Expertise: Fetal surgery, Clinical applications of fetal diagnosis and therapy, Endocrine surgery, Neonatal Surgery, Pectus surgery, Surgical treatment of This is one of the rarest of the anomalies prevalent among the conjoined twins and accounts for 2 – 6% of conjoined twins. Conjoined twins, on the other hand, are seen in about 10–20 children per billion births. Craniopagus twins are twins of the same gender, and conjoined twins have a female preponderance in the ratio of 3:1.Twin to twin transfusion (TTTS) and the other rare (incidence of about 1 in 100,000) but dramatic jeopardy is the conjoined twin. Twin to twin transfusion syndrome occurs in about 15% of all monochorionic twins wherein the shared placenta has usually an arterial to venous communication.The spectrum of vascular anomalies in patients with PTEN mutations: implications for diagnosis and management. J Med Genet. 2007 Sep; 44(9):594-602. View abstract; Hepatic hemangiomas: subtype classification and development of a clinical practice algorithm and registry. J Pediatr Surg. 2007 Jan; 42(1):62-7; discussion 67-8. View abstractAug 17, 2012Oct 19, 2017Polydactyly in Development, Inheritance, and Evolution Sex determination genes control the development of the Drosophila genital disc, modulating the response to Hedgehog, Wingless and Decapentaplegic signals. Development 128, 1033-1043. 2270. Sánchez, L. and Guerrero, I. (2001). The development of the …CONJOINED TWINS: DEVELOPMENTAL MALFORMATIONS AND …Jun 19, 2020Jun 16, [email protected] +1 415 476-2538. Stem Cell Transplantation. Our lab studies in utero hematopoietic stem cell transplantation (IUHCT) with the goal of elucidating mechanisms of engraftment and tolerance induction. Transplantation of allogeneic stem cells into the early gestational fetus can overcome the limitations of postnatal bone Craniopagus twins: surgicalaniatomy andembryologyandtheir implications FIG. 4 Totalcraniopagus: type III. conjoined skull, the long axis ofoneheadbeing rotated relative to that ofthe other through an angle of 140° or more (Fig. 3). In the third variety (type III), the angle of rotation of the long axis of one head on that of the other isThree-dimensional ultrasonographic features of diamniotic 6. Spencer, Rowena. Conjoined Twins: Developmental Malformations and Clinical Implications. Baltimore, MD: The John Hopkins University Press 2003. Conjoined twins are twins whose bodies are anatomically joined in utero. The degree to which the twins are attached can range