13 results on '"Kolon T"'
Search Results
2. Does Preoperative Testosterone Administration Decrease Complications in Distal Hypospadias Repair With Urethroplasty?
- Author
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Godlewski KF, Mittal S, Hyacinthe N, Fischer K, Weaver J, Van Batavia J, Weiss D, Srinivasan A, Shukla A, Zderic S, Kolon T, Zaontz M, and Long C
- Subjects
- Male, Humans, Child, Infant, Testosterone, Urethra surgery, Postoperative Complications epidemiology, Postoperative Complications prevention & control, Postoperative Complications etiology, Retrospective Studies, Treatment Outcome, Urologic Surgical Procedures, Male adverse effects, Urologic Surgical Procedures, Male methods, Hypospadias surgery, Hypospadias complications, Plastic Surgery Procedures adverse effects
- Abstract
Purpose: Testosterone administration prior to hypospadias repair is common practice among pediatric urologists; however, its impact on surgical outcomes remains controversial. We hypothesize that testosterone administration prior to distal hypospadias repair with urethroplasty significantly decreases postoperative complications., Materials and Methods: We queried our hypospadias database for primary distal hypospadias repairs with urethroplasty from 2015 to 2021. Patients undergoing repair without urethroplasty were excluded. We collected information on patient age, procedure type, testosterone administration status, initial visit and intraoperative glans width, urethroplasty length, and postoperative complications. To determine the role of testosterone administration on incidence of complications, a logistic regression adjusting for initial visit glans width, urethroplasty length, and age was performed., Results: A total of 368 patients underwent distal hypospadias repair with urethroplasty. One hundred thirty-three patients received testosterone and 235 did not. Initial visit glans width was significantly larger in the no-testosterone vs testosterone group (14.5 mm vs 13.1 mm, P = .001). Testosterone patients had significantly larger glans width at the time of surgery (17.1 mm vs 14.6 mm [no-testosterone group], P = .001). On multivariable logistic regression analysis after controlling for age at surgery, preoperative glans width, testosterone status, and urethroplasty length, testosterone administration did show significant association with reduced odds of postoperative complications (OR 0.4, P = .039)., Conclusions: This retrospective review of patients shows that on multivariable analysis there is significant association between testosterone administration and decreased incidence of complications in patients undergoing distal hypospadias repair with urethroplasty. Future studies on testosterone administration should focus on specific cohorts of patients with hypospadias as benefits of testosterone may be more evident in some subgroups than others.
- Published
- 2023
- Full Text
- View/download PDF
3. Predictors of Psychosocial Distress in Parents of Young Children with Disorders of Sex Development.
- Author
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Perez MN, Delozier AM, Aston CE, Austin P, Baskin L, Chan YM, Cheng EY, Diamond DA, Fried A, Greenfield S, Kolon T, Kropp B, Lakshmanan Y, Meyer S, Meyer T, Nokoff N, Palmer B, Paradis A, Poppas D, Scott Reyes KJ, Swartz JM, Tishelman A, Wisniewski AB, Wolfe-Christensen C, Yerkes E, and Mullins LL
- Subjects
- Adult, Child, Preschool, Disorders of Sex Development complications, Female, Humans, Incidence, Infant, Male, Prognosis, Risk Factors, Stress, Psychological epidemiology, Stress, Psychological psychology, United States epidemiology, Disorders of Sex Development psychology, Parents psychology, Quality of Life, Stress, Psychological etiology
- Abstract
Purpose: We evaluated demographic, financial and support predictors of distress for parents of young children with disorders of sex development including atypical genital development, and characterized early parental experiences. This work extends our previous findings to identify those parents at risk for distress., Materials and Methods: Participants included mothers (76) and fathers (63) of a child (78) diagnosed with disorders of sex development characterized by moderate to severe genital atypia. Parents completed a demographic questionnaire, measures of anxious and depressive symptoms, quality of life, illness uncertainty and posttraumatic stress symptoms, and rated their satisfaction with the appearance of their child's genitalia., Results: Depressive and posttraumatic stress symptoms of caregivers were comparable to standardized norms while levels of anxious symptoms were below norms. A subset of parents reported clinically elevated symptoms. Overall 26% of parents reported anxious symptoms, 24% reported depressive symptoms and 17% reported posttraumatic stress symptoms. Levels of illness uncertainty were lower than those of parents of children with other chronic illnesses. Differences by parent sex emerged, with mothers reporting greater distress. Lower income, increased medical care and travel expenses, and having no other children were related to increased psychosocial distress., Conclusions: Early psychosocial screening is recommended for parents of children with disorders of sex development. Clinicians should be aware that financial burden and lack of previous parenting experience are risk factors for distress.
- Published
- 2019
- Full Text
- View/download PDF
4. Psychological Adjustment of Parents of Children Born with Atypical Genitalia 1 Year after Genitoplasty.
- Author
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Ellens REH, Bakula DM, Mullins AJ, Scott Reyes KJ, Austin P, Baskin L, Bernabé K, Cheng EY, Fried A, Frimberger D, Galan D, Gonzalez L, Greenfield S, Kolon T, Kropp B, Lakshmanan Y, Meyer S, Meyer T, Mullins LL, Nokoff NJ, Palmer B, Poppas D, Paradis A, Yerkes E, Wisniewski AB, and Wolfe-Christensen C
- Subjects
- Adult, Child, Preschool, Decision Making, Disorders of Sex Development psychology, Female, Genitalia surgery, Gynecologic Surgical Procedures adverse effects, Gynecologic Surgical Procedures methods, Humans, Infant, Longitudinal Studies, Male, Middle Aged, Postoperative Complications epidemiology, Postoperative Complications etiology, Postoperative Period, Quality of Life, Plastic Surgery Procedures methods, Stress, Psychological diagnosis, Stress, Psychological psychology, Treatment Outcome, Urologic Surgical Procedures, Male adverse effects, Urologic Surgical Procedures, Male methods, Disorders of Sex Development surgery, Emotional Adjustment, Genitalia abnormalities, Parents psychology, Postoperative Complications psychology, Plastic Surgery Procedures adverse effects
- Abstract
Purpose: We examined the psychological adjustment of parents of children born with moderate to severe genital atypia 12 months after their child underwent genitoplasty., Materials and Methods: Parents were recruited longitudinally from a multicenter collaboration of 10 pediatric hospitals with specialty care for children with disorders/differences of sex development and/or congenital adrenal hyperplasia. Parents completed measures of depressive and anxious symptoms, illness uncertainty, quality of life, posttraumatic stress and decisional regret., Results: Compared to levels of distress at baseline (before genitoplasty) and 6 months after genitoplasty, data from 25 mothers and 20 fathers indicated significant improvements in all psychological distress variables. However, a subset of parents continued endorsing clinically relevant distress. Some level of decisional regret was endorsed by 28% of parents, although the specific decision that caused regret was not specified., Conclusions: Overall the majority of parents were coping well 1 year after their child underwent genitoplasty. Level of decisional regret was related to having a bachelor's level of education, increased levels of illness uncertainty preoperatively and persistent illness uncertainty at 12 months after genitoplasty but was unrelated to postoperative complications., (Copyright © 2017 American Urological Association Education and Research, Inc. Published by Elsevier Inc. All rights reserved.)
- Published
- 2017
- Full Text
- View/download PDF
5. Prenatal diagnosis of VACTERL association.
- Author
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Miller OF and Kolon TF
- Subjects
- Female, Humans, Infant, Newborn, Pregnancy, Abnormalities, Multiple diagnostic imaging, Anus, Imperforate diagnostic imaging, Heart Defects, Congenital diagnostic imaging, Kidney abnormalities, Kidney diagnostic imaging, Limb Deformities, Congenital diagnostic imaging, Spine abnormalities, Spine diagnostic imaging, Tracheoesophageal Fistula diagnostic imaging, Ultrasonography, Prenatal
- Published
- 2001
6. Comparison of single versus multiple dose regimens for the human chorionic gonadotropin stimulatory test.
- Author
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Kolon TF and Miller OF
- Subjects
- Child, Drug Administration Schedule, Humans, Male, Retrospective Studies, Chorionic Gonadotropin administration & dosage, Cryptorchidism blood, Hypospadias blood, Penis abnormalities, Testosterone blood
- Abstract
Purpose: Human chorionic gonadotropin (HCG) has a stimulatory effect on testicular steroidogenesis and has been widely used for evaluating male Leydig cell function. However, considerable variability exists in the protocols for HCG stimulation tests. In the most commonly used protocols HCG is administered daily for several days. We examine the circulating androgen response after 1 and 3-dose HCG regimens., Materials and Methods: We evaluated 77 prepubertal boys diagnosed with hypospadias, cryptorchidism or micropenis. In 60 boys who underwent 1 dose of 100 IU/kg. or 5,000 IU/1.7 m.(2) HCG serum testosterone and dihydrotestosterone were sampled at 72 (28) and 96 (32) hours after injection, while in 17 who underwent 3 daily age adjusted doses hormone levels were determined on day 4. All blood specimens were obtained and injections were performed at 8:00 to 9:00 a.m. and all specimens were evaluated at the same endocrine reference laboratory., Results: Nonstimulated testosterone levels were prepubertal in all groups. In the 1-dose groups post-stimulation testosterone was elevated 22 to 29-fold from baseline after a weight based and 34 to 35-fold after a body surface area based dose. Testosterone increased 20-fold baseline in the multi-dose group. No significant differences were observed in 72 versus 96-hour hormone levels., Conclusions: Evaluating Leydig cell function by HCG stimulation is an important adjunct to the diagnosis of various urological conditions. A single weight or body surface area based HCG dose with androgen measurement after 3 or 4 days is a practical, reliable and cost saving change in testicular evaluation.
- Published
- 2001
7. The dorsal inlay graft for hypospadias repair.
- Author
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Kolon TF and Gonzales ET Jr
- Subjects
- Child, Child, Preschool, Humans, Infant, Male, Hypospadias surgery, Skin Transplantation methods, Urethra surgery, Urologic Surgical Procedures, Male
- Abstract
Purpose: Hypospadias is a common genitourinary anomaly affecting every 1/300 male newborns. The goals of hypospadiac surgery include a straight penis with a urethral meatus at the tip of the glans, a well vascularized neourethra of adequate caliber with a solid, straight urinary stream and achievement of sexual function when mature. Current theory advocates preservation of the urethral plate with chordee correction. Hypospadias repair without an adequate urethral plate to roll into a tube requires longitudinal incision of the plate or a transverse preputial island flap. We describe a technique of 1-stage urethroplasty using an inner preputial based dorsal inlay graft., Materials and Methods: After the penis is degloved and chordee corrected incisions are made bilaterally along the urethral plate from the native urethral meatus to the glans tip. The urethral plate is incised longitudinally. A graft harvested from the inner prepuce is defatted and sutured onto the incised urethral plate. The neourethra is rolled into a tube in Thiersch-Duplay fashion., Results: This technique was used in 32 patients. The original urethral meatus was coronal to penoscrotal and chordee release was performed concomitantly. At 21 months of followup no patient had a stricture, fistula or diverticulum at the inlay graft site., Conclusions: This technique successfully fulfills all traditional hypospadias repair criteria. We believe that the dorsal inlay graft after incision of the urethral plate is a rapid, easy and successful addition to the armamentarium of the "hypospadiologist."
- Published
- 2000
8. Upper urinary tract manifestations of the VACTERL association.
- Author
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Kolon TF, Gray CL, Sutherland RW, Roth DR, and Gonzales ET Jr
- Subjects
- Child, Female, Humans, Hydronephrosis etiology, Kidney abnormalities, Male, Retrospective Studies, Vesico-Ureteral Reflux etiology, Abnormalities, Multiple, Urogenital Abnormalities
- Abstract
Purpose: In patients suspected to have the vertebral, anal, tracheoesophageal, renal, radial, cardiac and limb abnormalities (VACTERL) association we studied the frequency of upper urinary tract anomalies, prevalence of these features, predictability of upper tract pathology and proper screening evaluation., Materials and Methods: From 1991 to 1998 we identified 55 patients with the VACTERL association. Upper urinary tract assessment, including initial renal ultrasound and voiding cystourethrography, and followup data were available for 29 boys and 15 girls. Patients were considered to have the VACTERL association when 3 or more organ systems were involved., Results: Average followup was 5.4 years. Upper urinary tract involvement was noted in 41 of the 44 patients (93.2%) and vesicoureteral reflux in 17 (25 renal units). Of the kidneys 21 were hydronephrotic without reflux or obstruction, 10 were solitary, 3 were multicystic dysplastic, 8 were obstructed and only 17 were normal. A total of 27 patients (61%) underwent at least 1 genitourinary procedure, primarily ureteroneocystotomy. All children were alive at the last followup., Conclusions: The VACTERL association involves multiple serious anomalies. However, these infants generally have a good outcome. Since the upper urinary system is the most common organ system involved, patients should receive prophylactic antibiotics until an initial urological assessment with renal ultrasound and voiding cystourethrography is performed. It is essential for physicians to know that most children with the VACTERL association have urological involvement that requires treatment and long-term management.
- Published
- 2000
9. A multicenter outcomes analysis of patients with neonatal reflux presenting with prenatal hydronephrosis.
- Author
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Herndon CD, McKenna PH, Kolon TF, Gonzales ET, Baker LA, and Docimo SG
- Subjects
- Female, Humans, Infant, Newborn, Male, Outcome Assessment, Health Care, Retrospective Studies, Ultrasonography, Prenatal, Vesico-Ureteral Reflux therapy, Hydronephrosis complications, Hydronephrosis diagnostic imaging, Vesico-Ureteral Reflux diagnosis, Vesico-Ureteral Reflux etiology
- Abstract
Purpose: Approximately 10 to 30% of prenatal cases of hydronephrosis result in the postnatal diagnosis of vesicoureteral reflux. Using a new generic prenatal-postnatal data sheet developed by the Society for Fetal Urology the characteristics, natural history and outcome of prenatal hydronephrosis confirmed postnatally to be vesicoureteral reflux were documented at 3 centers., Materials and Methods: We performed a retrospective multicenter review of Society for Fetal Urology data sheets completed for each patient in whom prenatal hydronephrosis was proved to be postnatal vesicoureteral reflux from 1993 to 1998., Results: In 56 male and 15 female patients with prenatal hydronephrosis a total of 116 refluxing renal units were confirmed postnatally. Of the 116 renal units 112 were hydronephrotic prenatally. During gestation increased hydronephrosis was noted with voiding in 4 cases. Of the 112 hydronephrotic renal units only 26 ureters in 15 patients were seen prenatally. The obstetrician considered the diagnosis of vesicoureteral reflux in only 24% of the cases. Postnatally 116 refluxing renal units were identified. Initial postnatal ultrasound was normal in 25% of the cases. Bilateral reflux was present in 36 male and 9 female patients. In 10 of the 19 uncircumcised patients (53%) urinary tract infection developed despite antibiotic prophylaxis. In 15 of the 74 renal units with grades III to V reflux the condition resolved at an average patient age of 0.9 and 2.1 years in boys and girls, respectively. A total of 27 refluxing renal units were reimplanted., Conclusions: The majority of prenatal reflux occurs in boys, and it is high grade and bilateral. The data sheets designed by the Society for Fetal Urology are useful data collection instruments. The presentation and natural history of vesicoureteral reflux are different in male and female individuals. In a significant number of renal units high grade reflux resolves spontaneously. Early circumcision may decrease the incidence of breakthrough urinary tract infection in this subpopulation. In addition, the effective management of prenatally detected reflux depends on multispecialty communication.
- Published
- 1999
- Full Text
- View/download PDF
10. Analysis of homeobox gene HOXA10 mutations in cryptorchidism.
- Author
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Kolon TF, Wiener JS, Lewitton M, Roth DR, Gonzales ET Jr, and Lamb DJ
- Subjects
- Child, DNA, Neoplasm analysis, Humans, Male, Sequence Analysis, DNA, Cryptorchidism genetics, Genes, Homeobox genetics, Mutation
- Abstract
Purpose: Cryptorchidism is the most common congenital abnormality of the genitalia. However, its exact etiology remains to be defined. Homeobox (HOX) containing genes have a key role in the morphogenesis of segmental structures along the primary body axis, including the urogenital mesenchyma. In male mice with a targeted deletion of the HOXA10 gene cryptorchidism manifests in the absence of other major defects. Because to our knowledge this gene has never been examined for alterations in humans, we evaluated whether mutations of HOXA10 are associated with cryptorchidism in humans., Materials and Methods: Genomic deoxyribonucleic acid (DNA) was extracted from human blood or tissue samples from 16 noncryptorchid control subjects and 45 cryptorchid boys. To screen for mutations exons 1 and 2 of the HOXA10 gene were amplified individually by polymerase chain reaction using 6 overlapping oligonucleotide primer pairs. Single strand conformational polymorphism (SSCP) analysis of the amplified radiolabeled DNA fragments was performed. Variant band shifts were detected due to abnormal migration of the denatured DNA fragment compared to controls, suggesting an alteration in the DNA sequence. Sequence analysis of these variant bands was then done to define any mutations., Results: SSCP analysis revealed variants in 2 controls. Of the 45 samples from cryptorchid patients 30 had SSCP variants in exon 1. No variants were found in other regions of the gene. Sequence analysis revealed several DNA polymorphisms in exon 1 in controls and boys with cryptorchidism. Other nucleotide changes (point mutations) were noted only in exon 1 in the DNA of 5 cryptorchid patients, of whom 1 had a 24 nucleotide deletion., Conclusions: Our initial analysis of the HOXA10 gene in humans demonstrates that genetic alterations of this gene may be present in some boys with cryptorchidism. HOXA10 polymorphisms exist in normal control subjects as well as in cryptorchid patients. Further analysis of the function of the mutated protein will elucidate the role of this gene as a potential causative factor of testicular descent.
- Published
- 1999
11. Clinical and molecular analysis of XX sex reversed patients.
- Author
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Kolon TF, Ferrer FA, and McKenna PH
- Subjects
- Disorders of Sex Development diagnosis, Female, Humans, Male, Disorders of Sex Development genetics, X Chromosome genetics, Y Chromosome genetics
- Abstract
Purpose: The XX male syndrome presents with a spectrum of clinical appearances from phenotypic male individuals to true hermaphrodites. Previous reports established the sex determining region of the Y chromosome (SRY) gene as the testis determining factor. However, a subset of XX sex reversed male individuals exists without a translocation of SRY deoxyribonucleic acid (DNA) material to the X chromosome. In addition to clinical or endocrinological criteria, Y DNA probe studies, and radiological and surgical evaluation as indicated are necessary for an accurate diagnosis., Materials and Methods: We evaluated 5 XX sex reversed patients (2 true hermaphrodites and 3 male individuals) by physical examination, pedigree analysis, endocrinological testing, molecular analysis of Y DNA, radiological studies and surgery (exploration and/or biopsy)., Results: All patients were SRY gene negative. Two patients were siblings. Complete endocrinological testing was negative in all cases. Two patients had a normal male phenotype. Radiological findings confirmed by cystoscopy or laparoscopy revealed a utricle, vesicoureteral reflux, and cervix and uterus in various patients. Gonadal biopsy showed ovotestes or ovary and testis in the 2 true hermaphrodites. The 3 XX male individuals had normal immature testes on biopsy., Conclusions: Categories of XX sex reversal include classic XX male individuals with normal phenotypes, nonclassic XX male individuals with sexual ambiguity and XX true hermaphrodites. Simple translocation of the SRY gene to the X chromosome does not always account for testicular differentiation and a male phenotype. The masculinization of our patients in the absence of SRY suggests an alteration of 1 or more downstream Y, X or autosomal testis determining genes. We present another theory for male sex determination, including a downstream gene on the X chromosome in which expression is influenced by X inactivation. Y DNA genomic analysis, radiological studies and laparoscopic evaluation with gonadal biopsy as appropriate are recommended for complete assessment and treatment of these intersex patients.
- Published
- 1998
- Full Text
- View/download PDF
12. Malignant Sertoli cell tumor in a prepubescent boy.
- Author
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Kolon TF and Hochman HI
- Subjects
- Child, Humans, Male, Sertoli Cell Tumor pathology, Testicular Neoplasms pathology
- Published
- 1997
13. The impact of co-morbidity on life expectancy among men with localized prostate cancer.
- Author
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Albertsen PC, Fryback DG, Storer BE, Kolon TF, and Fine J
- Subjects
- Aged, Chi-Square Distribution, Cohort Studies, Comorbidity, Humans, Life Expectancy, Male, Multivariate Analysis, Proportional Hazards Models, Retrospective Studies, Prostatic Neoplasms mortality
- Abstract
Purpose: We evaluated 3 indexes used to assess patient co-morbidities to determine whether they could predict mortality among men with clinically localized prostate cancer., Materials and Methods: We measured the impact of co-morbidity classifications on all cause mortality using a parametric proportional hazards model based on a retrospective cohort analysis., Results: Each index tested is a highly significant predictor of mortality for patients dying of nonprostate cancer related causes after adjusting for age and Gleason score., Conclusions: Each co-morbidity index provides significant, independent predictive information concerning patient mortality beyond that provided by age, Gleason score and clinical stage alone.
- Published
- 1996
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