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Disorders of or differences in sexual development (DSD) are defined by congenital conditions in which development of chromosomal, gonadal, or anatomic sex are atypical. Here, we report on monochorionic diamniotic twins delivered by caesarean section in the 36th week of pregnancy. Monochorionic twins are usually monozygous and thus should have the same sexual differentiation.

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Congenital diaphragmatic hernia (CDH) is a serious life-threatening birth defect characterized by abnormal development in the muscular or tendinous portion of the diaphragm during embryogenesis. Despite its high incidence, the etiology of CDH hasn't been fully understood. Genetic factors are important in pathogenesis; however, few single genes have been definitively implicated in human CDH.

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A rare case of heteropaternal twin calves after natural mating in Brazil.

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Curso de Medicina Veterinária, Faculdade de Agronomia e Medicina Veterinária, Universidade de Passo Fundo - UPF, Passo Fundo, RS, Brasil.

Twin birth is a complex condition observed in most livestock animals, when the female gives birth to two or more offspring, generally out of the same mating. In cattle, it is a rare condition (3 to 5%) and depends on the genetic background and environmental factors. Twin birth is a result of multiple ovulations, being more common in dairy rather than in beef cattle.

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Maternal-fetal transport of calcium (Ca) is important for bone mineralization in fetal development. Insufficient Ca transport causes transient neonatal hyperparathyroidism (TNHP). Transient receptor potential cation channel, subfamily V, member 6 (TRPV6), has been found to play an important role in the active transport of Ca through the placenta.

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Background: Bisphosphonates (BP) are sometimes used in children and young women, but their use requires expertise and caution due to the relative lack of long-term efficacy and safety data.

Clinical Cases: We report on two dizygotic male twins with a past of mild prematurity who presented at the age of 2 months with moderate clinical craniotabes, hypophosphatemia, normal circulating calcium, severe hypercalciuria, and low parathyroid hormone levels. Following supplementation with oral phosphorus and native vitamin D, the clinical and biological abnormalities disappeared within 2 months.

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