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1.
Reprod Fertil Dev ; 25(6): 866-78, 2013.
Artículo en Inglés | MEDLINE | ID: mdl-22953725

RESUMEN

The European brown hare (Lepus europaeus) is the only species with superconception, whereby the maternal reproductive tract hosts two sets of conceptuses at different developmental stages. The embryonic development of the hare has not yet been described. To understand the mechanism of superconception, we studied oviduct transport and implantation stages by embryo flushing and live high-resolution ultrasound. Ultrasound data of implantation stages is correlated with histology. In the oviduct, a mucin coat is deposited on the zona pellucida. The blastocysts enter the uterine horns on Day 5, 1 day later than in the rabbit, and directly expand approximately threefold. Spacing is accompanied by peristaltic movement of the endometrium. The mucin coat disappears and the conceptuses attach. The yolk-sac expands in the blastocoel and syncytial knobs invade the antimesometrial endometrium. Maternal blood lacunae appear in the mesometrial endometrial folds, which are subsequently invaded by the syncytiotrophoblast. The haemochorial chorioallantoic placenta forms. The yolk-sac cavity is gradually replaced by the allantois and finally by the exocoel. The different reproductive strategies of the precocial hare and the altricial rabbit are discussed. We assume that the lagomorph-specific mucin coat and the hare-specific delay of the oviduct-uterine transition are prerequisites for superconception.


Asunto(s)
Blastocisto/fisiología , Implantación del Embrión , Embrión de Mamíferos/fisiología , Desarrollo Embrionario , Liebres/embriología , Alantoides/diagnóstico por imagen , Alantoides/fisiología , Animales , Animales Salvajes , Animales de Zoológico , Blastocisto/citología , Blastocisto/diagnóstico por imagen , Embrión de Mamíferos/citología , Embrión de Mamíferos/diagnóstico por imagen , Endometrio/citología , Endometrio/diagnóstico por imagen , Endometrio/fisiología , Trompas Uterinas/diagnóstico por imagen , Trompas Uterinas/fisiología , Femenino , Alemania , Mucinas/metabolismo , Placenta/diagnóstico por imagen , Placenta/fisiología , Embarazo , Especificidad de la Especie , Trofoblastos/citología , Trofoblastos/diagnóstico por imagen , Trofoblastos/fisiología , Ultrasonografía , Saco Vitelino/citología , Saco Vitelino/diagnóstico por imagen , Saco Vitelino/fisiología , Zona Pelúcida/diagnóstico por imagen , Zona Pelúcida/metabolismo
2.
Ultrasound Obstet Gynecol ; 38(1): 116-8, 2011 Jul.
Artículo en Inglés | MEDLINE | ID: mdl-21713991

RESUMEN

Allantoic cysts are a somewhat rare entity. They are identifiable on antenatal ultrasound examination but are not easily distinguishable from pseudocysts, which are often associated with a poor prognosis. Their etiology remains obscure and obstructive uropathies have been proposed to be one of the underlying mechanisms. We report on a case in which both allantoic cysts and a patent urachus were detected antenatally and turned out to be associated with posterior urethral valves (PUV). The cysts were first seen in the early second trimester, with a full fetal bladder and patent urachus. They disappeared by the 29(th) week. During the subsequent sonographic examinations, the bladder was emptying regularly. The kidneys remained normal throughout the pregnancy. It is hypothesized that the increased pressure within the urinary tract kept the urachus patent, led to the formation of allantoic cysts and, later, to their perforation; this allowed the fetus to empty his bladder and kept him from the usual complications of PUV. This case emphasizes the importance of detection and characterization of umbilical cord cysts on antenatal ultasound examination and suggests that obstructive uropathies should be included in the differential diagnosis of umbilical cord cyst communicating with the fetal bladder.


Asunto(s)
Quiste del Uraco/diagnóstico por imagen , Uretra/anomalías , Enfermedades Uretrales/diagnóstico por imagen , Enfermedades de la Vejiga Urinaria/diagnóstico por imagen , Adulto , Alantoides/diagnóstico por imagen , Femenino , Humanos , Riñón/diagnóstico por imagen , Riñón/embriología , Masculino , Embarazo , Ultrasonografía Prenatal , Quiste del Uraco/embriología , Uretra/diagnóstico por imagen , Enfermedades Uretrales/embriología , Enfermedades de la Vejiga Urinaria/embriología
3.
Fetal Diagn Ther ; 25(2): 250-4, 2009.
Artículo en Inglés | MEDLINE | ID: mdl-19506385

RESUMEN

We present a unique case of umbilical cord cysts of allantoic and omphalomesenteric remnants with progressive cord edema during pregnancy. Enlargement of the umbilical cord was observed initially at 28 weeks' gestation; the cord cysts were first recognized at 17 weeks. At 37 weeks, a cesarean section was performed and a male infant weighing 2,300 g was delivered. The entire length of the umbilical cord was 80 cm; the 50-cm proximal portion was strikingly edematous and was 7 cm in diameter. On the 1st day of life, operative exploration was undertaken via an infraumbilical incision. It was evident that a patent urachus protruded from the bladder. The lesion was excised and the bladder was closed in a two-layer anastomosis. Histologically, the intestinal epithelium was connected to the transitional epithelium at the top of the urachus, indicating allantoic remnants fused with omphalomesenteric remnants. Such a case has not been reported previously. It was considered that the overflow of urine from allantoic remnants to omphalomesenteric remnants caused the extraordinary edema of the umbilical matrix. Based on our experience, finding progressive umbilical cord edema may indicate a patent urachus co-existing with allantoic and omphalomesenteric remnants.


Asunto(s)
Alantoides/diagnóstico por imagen , Quistes/diagnóstico por imagen , Hidropesía Fetal/diagnóstico por imagen , Cordón Umbilical/diagnóstico por imagen , Uraco/anomalías , Conducto Vitelino/diagnóstico por imagen , Adulto , Quistes/complicaciones , Femenino , Humanos , Hidropesía Fetal/etiología , Recién Nacido , Masculino , Embarazo , Ultrasonografía
4.
J Am Vet Med Assoc ; 225(5): 717-21, 2004 Sep 01.
Artículo en Inglés | MEDLINE | ID: mdl-15457665

RESUMEN

OBJECTIVE: To determine whether gavage of pregnant mares (housed without access to pasture) with starved eastern tent caterpillars (ETCs) or their excreta is associated with early fetal loss (EFL), panophthalmitis, or pericarditis. DESIGN: Randomized clinical trial. ANIMALS: 15 mares. PROCEDURE: 15 mares with fetuses from 40 to 80 days of gestation (dGa) were randomly assigned to 1 of 3 groups and received 2.5 g of ETC excreta, 50 g of starved ETCs, or 500 mL of water, respectively, once daily for 10 days. Mares were housed in box stalls, walked twice daily, and not allowed access to pasture for 12 days before or during the 21-day trial. RESULTS: 4 of 5 mares gavaged with starved ETCs (group 2) aborted on trial days 8 (2 mares), 10, and 13. No control mares or mares that received excreta aborted. Differences between the ETC group and other groups were significant. Abortion occurred on 49, 64, 70, and 96 dGa. Allantoic fluids became hyperechoic the day before or the day of fetal death. Alpha streptococci were recovered from 1 fetus and Serratia marcescens from 3 fetuses. Neither panophthalmitis nor pericarditis was seen. The abortifacient component of the ETCs was not elucidated. CONCLUSIONS AND CLINICAL RELEVANCE: These findings suggest that mares with fetuses from 40 to 120 days of gestation should not be exposed to ETCs because they may induce abortion.


Asunto(s)
Aborto Veterinario/etiología , Muerte Fetal/veterinaria , Contaminación de Alimentos , Enfermedades de los Caballos/etiología , Mariposas Nocturnas/patogenicidad , Resultado del Embarazo/veterinaria , Alantoides/diagnóstico por imagen , Alimentación Animal/efectos adversos , Animales , Femenino , Muerte Fetal/etiología , Caballos , Embarazo , Factores de Riesgo , Factores de Tiempo , Ultrasonografía Prenatal/veterinaria
5.
J Am Vet Med Assoc ; 204(1): 108-11, 1994 Jan 01.
Artículo en Inglés | MEDLINE | ID: mdl-8125808

RESUMEN

Hydrallantois was diagnosed in a 5-year-old Toggenburg doe. Clinical signs included bilateral abdominal distention, anorexia, and recumbency. Ultrasonographically, excessive fluid and live fetuses were detected in the uterus. At the time of cesarean section, the fluid (approx 12 L) was determined to be in the allantoic cavities; concentrations of electrolytes in the fluid were similar to concentrations in allantoic fluid from cows with hydrallantois. Two viable fetuses and 1 nonviable fetus were delivered. The doe retained its placentas for 60 hours, but made a good recovery. Hydrallantois should be considered in the differential diagnosis of abdominal distention in caprine does in late gestation.


Asunto(s)
Alantoides/química , Edema/veterinaria , Enfermedades de las Cabras , Alantoides/diagnóstico por imagen , Animales , Cesárea/veterinaria , Diagnóstico Diferencial , Edema/diagnóstico por imagen , Edema/terapia , Femenino , Muerte Fetal/etiología , Muerte Fetal/veterinaria , Enfermedades de las Cabras/diagnóstico por imagen , Enfermedades de las Cabras/terapia , Cabras , Masculino , Embarazo , Ultrasonografía Prenatal/veterinaria
6.
BMJ Case Rep ; 20122012 Aug 27.
Artículo en Inglés | MEDLINE | ID: mdl-22927270

RESUMEN

Allantiod cysts are true cysts in the umbilical cord. They arise from persistent structures of allantois, and the cysts are filled with urine because of a connection to the urinary bladder. Allantoid cysts are located centrally in the umbilical cord and separate the umbilical cord vessels. B-flow ultrasound is a new technique illustrating blood flow. This method is independent of the insonation angle and therefore superior to Doppler ultrasound visualising long segments of vessels with a winding course. The authors present a case with allantoid cysts diagnosed with B-flow ultrasound.


Asunto(s)
Alantoides/diagnóstico por imagen , Procesamiento de Imagen Asistido por Computador , Imagenología Tridimensional , Ultrasonografía Prenatal , Cordón Umbilical/diagnóstico por imagen , Quiste del Uraco/diagnóstico por imagen , Adulto , Alantoides/embriología , Alantoides/patología , Cesárea , Diagnóstico Diferencial , Endotelio/patología , Epitelio/patología , Femenino , Humanos , Recién Nacido , Masculino , Placenta/diagnóstico por imagen , Embarazo , Primer Trimestre del Embarazo , Segundo Trimestre del Embarazo , Rotura Espontánea , Cordón Umbilical/embriología , Cordón Umbilical/patología , Quiste del Uraco/embriología , Quiste del Uraco/patología
7.
Fetal Diagn Ther ; 18(2): 87-90, 2003.
Artículo en Inglés | MEDLINE | ID: mdl-12576742

RESUMEN

A vesicoallantoic cyst in the umbilical cord was detected by fetal ultrasonography at 16 weeks of gestation. The blood flow through the umbilical vessels was evaluated with periodic color Doppler ultrasonographic examinations because compression by the cyst may cause reduction in blood flow and lead to fetal death. After disappearance of the cyst, the infant was delivered vaginally. Retrograde cystography revealed a narrow channel between the bladder and the navel, confirming patent urachus, which was resected without any complications.


Asunto(s)
Alantoides/diagnóstico por imagen , Quistes/diagnóstico por imagen , Enfermedades Fetales/diagnóstico por imagen , Cordón Umbilical/diagnóstico por imagen , Adulto , Alantoides/patología , Quistes/patología , Femenino , Enfermedades Fetales/patología , Humanos , Embarazo , Ultrasonografía , Cordón Umbilical/patología , Uraco/anomalías , Uraco/diagnóstico por imagen
8.
Ultrasound Obstet Gynecol ; 9(6): 422-4, 1997 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-9239830

RESUMEN

We present the sonographic findings of a fetus with a vesicoallantoic cyst. The cyst was first identified at 17 weeks of gestation; it was associated with an omphalocele, and disappeared spontaneously at 29 weeks. The fetal urinary bladder was not visualized thereafter. An omphalocele and exstrophia of the urachus were found at birth and repaired. Non-visualization of the fetal urinary bladder suggested rupture of the covering membrane of the omphalocele and allantois during fetal life. A defect in the wall of the omphalocele supported our hypothesis.


Asunto(s)
Alantoides/diagnóstico por imagen , Quistes/diagnóstico por imagen , Ultrasonografía Prenatal , Uraco/anomalías , Vejiga Urinaria/diagnóstico por imagen , Adulto , Quistes/complicaciones , Femenino , Edad Gestacional , Hernia Umbilical/diagnóstico por imagen , Hernia Umbilical/cirugía , Humanos , Recién Nacido , Masculino , Embarazo , Segundo Trimestre del Embarazo , Remisión Espontánea , Uraco/diagnóstico por imagen , Vejiga Urinaria/embriología
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