1/10. Clinical and genetic heterogeneity in Desbuquois dysplasia.Desbuquois dysplasia is a rare chondrodysplasia of autosomal recessive inheritance characterized by short stature, joint laxity, facial anomalies, a "Swedish key" appearance of the proximal femur, and advanced carpal and tarsal bone age. patients with Desbuquois dysplasia can be divided in two groups, depending on whether hand changes include an extra ossification center distal to the second metacarpal and whether phalangeal dislocations are present or absent. We have recently reported linkage of a Desbuquois dysplasia gene to 17q25.3 in a group of patients with typical hand abnormalities. Here, we report on the exclusion of the 17q25.3 locus in three inbred Desbuquois families originated from turkey, Asia, and morocco without typical hand abnormalities. Microsatellite dna markers from the 17q25.3 region were used at an average spacing of 2 cM, and the three affected individuals from families 1 to 3 were heterozygous for the 17q25.3 region. These results allow us to exclude this region as the locus in Desbuquois families with no hand anomalies and demonstrate genetic heterogeneity. Ongoing studies will hopefully lead to the identification of the responsible genes.- - - - - - - - - - ranking = 1keywords = dysplasia (Clic here for more details about this article) |
2/10. Oto-palato-digital syndrome type II. Report of two related cases.Two cases with major features of bowed long bones, hypertelorism, mandibular hypoplasia and hand and foot abnormalities with early neonatal death due to respiratory failure are presented. The radiologic and clinical findings are in keeping with oto-palato-digital syndrome type II and differ significantly from other causes of bowed long bones such as campomelic and kyphomelic dysplasias.- - - - - - - - - - ranking = 0.125keywords = dysplasia (Clic here for more details about this article) |
3/10. adult ectodermal dysplasia syndrome resulting from the missense mutation R298Q in the p63 gene.Several ectodermal dysplasia syndromes have been shown to result from mutations in the gene that encodes the transcription factor p63. We describe an 11-year-old boy, with clinically normal parents, who had a developmental disorder that resembled EEC (ectrodactyly ectodermal dysplasia-clefting) syndrome (OMIM 604292). He had ectrodactyly and missing middle fingers bilaterally, onychodysplasia, hypodontia with missing teeth, hypohidrosis and lacrimal duct obstruction. dna sequencing disclosed a heterozygous G-->A substitution at nucleotide 893, that converts an arginine residue (CGA) to glutamine (CAA), the mutation being designated R298Q. This mutation occurs within the dna-binding domain of p63, and is close to many of the published EEC syndrome mutations. However, R298Q has been described once previously in a large German pedigree, not with EEC syndrome, but another ectodermal dysplasia disorder, adult (acro-dermato-ungual-lacrimal-tooth) syndrome (OMIM 103285). Further clinical assessment in our patient revealed that, apart from not having cleft lip and/or palate, he had an exfoliative dermatitis of his hands and feet, and some freckling on his face and shoulders. Collectively, these features support a diagnosis of adult syndrome. This study has identified a specific genotype-phenotype correlation in a rare ectodermal dysplasia syndrome and the findings are useful in improving genetic counselling in this family.- - - - - - - - - - ranking = 520.69013707314keywords = dysplasia syndrome, dysplasia (Clic here for more details about this article) |
4/10. Biliary lithiasis in early pregnancy and abnormal development of facial and distal limb bones (Binder syndrome): a possible role for vitamin k deficiency.BACKGROUND: Binder syndrome is a maxillonasal dysostosis characterized by midface and nasal hypoplasia, sometimes associated with short terminal phalanges of fingers and toes and transient radiological features of chondrodysplasia punctata. warfarin- or phenytoin-induced vitamin k deficiency during early pregnancy is a well-established etiology for this syndrome, which occurs nevertheless sporadically in most cases. CASE(S): We describe here the first case, to our knowledge, of Binder syndrome in a child whose mother presented with biliary lithiasis in early pregnancy. The mother proved to have a decrease in clotting factors II, VII, and X, and in prothrombin time, at 11 weeks of gestation, which was highly suggestive of vitamin k deficiency. CONCLUSIONS: The biliary lithiasis-induced vitamin k deficiency in early pregnancy is likely to have resulted in Binder syndrome. This observation should prompt physicians to carefully check for vitamin k deficiency in pregnant women presenting with biliary lithiasis, in order to prevent Binder syndrome in the fetus by providing intravenous vitamin K supplementation as soon as possible. Finally, reassuring genetic counseling regarding the genetic risk for future pregnancies is to be provided to the parents.- - - - - - - - - - ranking = 0.125keywords = dysplasia (Clic here for more details about this article) |
5/10. Mild optic nerve hypoplasia with retinal venous tortuosity in aarskog (facial-digital-genital) syndrome.Aarskog syndrome (faciogenital dysplasia) is an X-linked recessive genetic growth disorder characterized by short stature, dysmorphic facies, shawl scrotum, and digital anomalies. The condition was first described in 1970 and the gene responsible is FGD1 (MIM#305400). There are several reported ophthalmic findings associated with Aarskog syndrome which are discussed. We describe a case of Aarskog syndrome with venous tortuosity, optic nerve hypoplasia, and a type-2 antithrombin deficiency.- - - - - - - - - - ranking = 0.125keywords = dysplasia (Clic here for more details about this article) |
6/10. Ossicular abnormality in Larsen's syndrome: a case report.Larsen's syndrome consists of a skeletal dysplasia with multiple joint abnormalities and a characteristic facies. No reports of this syndrome have documented hearing loss due to ossicular joint abnormalities. A 6-year-old girl is presented with the characteristic abnormalities of Larsen's syndrome, a normal otoscopic examination, and significant bilateral conductive hearing loss. Exploratory tympanotomy demonstrated an incudostapedial joint abnormality, as well as a fixed stapes footplate. The possibility of ossicular joint abnormalities, in addition to the other joint abnormalities associated with this syndrome, must be considered.- - - - - - - - - - ranking = 0.125keywords = dysplasia (Clic here for more details about this article) |
7/10. Skeletal dysplasia syndrome with progeroid appearance, characteristic facial and limb anomalies, multiple synostoses, and distinct skeletal changes: a variant example of the Lenz-Majewski syndrome.Here we report a 10 year-old mentally retarded, deaf boy with a unique pattern of anomalies: progeroid appearance, characteristic facial and limb anomalies, multiple synostoses, and distinct skeletal changes. He represents a variant example of "hyperostotic dwarfism" as delineated by Lenz and Majewski.- - - - - - - - - - ranking = 346.87675804876keywords = dysplasia syndrome, dysplasia (Clic here for more details about this article) |
8/10. Gracile bone dysplasia.Gracile bones are a frequent abnormality associated with fetal hypokinesia of any cause. With the exception of thin, undermineralized bones, the chondro-osseous structure is usually normal in these cases. We present a lethal skeletal dysplasia comprising minor anomalies, central nervous system abnormalities, gracile long bones, and abnormal chondro-osseous morphology. In addition to a short, disordered growth plate, the chondrocytes contained dilated loops of rough endoplasmic reticulum, suggesting an abnormality of an extracellular matrix protein. This protein appears to have effects on chondro-osseous and on facial and central nervous system development. We suggest the term "gracile bone dysplasia" to describe this disorder.- - - - - - - - - - ranking = 0.75keywords = dysplasia (Clic here for more details about this article) |
9/10. Skeletal dysplasias with gracile bones: three new cases, including two offspring of a mother with a dwarfing condition.We describe 3 new cases of a rare form of dwarfism (so-called "lethal skeletal dysplasia with gracile bones" or "osteocraniostenosis"), a condition characterized by thin, brittle bones and death in late gestation or early neonatal life. The first was a 37-week gestation female who died at delivery. She had facial anomalies and positional abnormalities of the hands and feet. The others were male stillborn sibs, who died in utero in the third trimester. Their mother had an undiagnosed dwarfing condition associated with body asymmetry, microcephaly, and unusual facial appearance. Both fetuses were documented by ultrasound to have short limbs and probable long bone fractures late in the second trimester. At autopsy, one fetus had no spleen and the other a hypoplastic spleen. Radiographically, all three cases had very thin diaphyses, diaphyseal fractures, and thin ribs and clavicles. In contrast to the first case who had a normally mineralized calvaria, the sibs had grossly deficient calvarial mineralization. Microscopically, endochondral ossification was qualitatively normal but quantitatively deficient in all three cases. The long bones, especially those of the sibs, lacked the well-defined outer cortex in the mid-shaft normally seen by the third trimester. This failure of organization into the cortex and medulla suggests a failure of bone remodelling. Given the variable presentation in these cases, "lethal skeletal dysplasia with gracile bones" is probably a heterogeneous disorder. The recurrence in one family suggests that the mother has somatic/germline mosaicism of a lethal gene, expressed clinically as growth failure and asymmetry.- - - - - - - - - - ranking = 0.75keywords = dysplasia (Clic here for more details about this article) |
10/10. Bilateral radial ray hypoplasia with multiple epiphyseal dysplasia.We describe a 5-4/12-year-old girl with the unique combination of bilateral radial ray hypoplasia and multiple epiphyseal dysplasia (MED). Radial ray hypoplasia was diagnosed at birth. MED was documented at age 4-3/12 years when she presented with leg pain and short stature and was found to have femoral anteversion and tibial torsion giving rise to severe genu valgum deformity and intoeing. She has no facial anomalies and is developmentally normal. family history is unremarkable and chromosomal analysis was normal. Investigation of mineral metabolism showed idiopathic hypercalciuria. Surgical lengthening of her severely hypoplastic left radius at age 19 months was successful. Bilateral femoral and tibial osteotomies at age 5-4/12 years corrected her lower limb deformities. This combination of two distinctive but rare skeletal abnormalities may represent a new syndrome.- - - - - - - - - - ranking = 0.625keywords = dysplasia (Clic here for more details about this article) |
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