Publications by authors named "Ian Simmons"

Pituitary adenomas are rare in children and young people under the age of 19 (hereafter referred to as CYP) but they pose some different diagnostic and management challenges in this age group than in adults. These rare neoplasms can disrupt maturational, visual, intellectual and developmental processes and, in CYP, they tend to have more occult presentation, aggressive behaviour and are more likely to have a genetic basis than in adults. Through standardized AGREE II methodology, literature review and Delphi consensus, a multidisciplinary expert group developed 74 pragmatic management recommendations aimed at optimizing care for CYP in the first-ever comprehensive consensus guideline to cover the care of CYP with pituitary adenoma.

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Tumours of the anterior part of the pituitary gland represent just 1% of all childhood (aged <15 years) intracranial neoplasms, yet they can confer high morbidity and little evidence and guidance is in place for their management. Between 2014 and 2022, a multidisciplinary expert group systematically developed the first comprehensive clinical practice consensus guideline for children and young people under the age 19 years (hereafter referred to as CYP) presenting with a suspected pituitary adenoma to inform specialist care and improve health outcomes. Through robust literature searches and a Delphi consensus exercise with an international Delphi consensus panel of experts, the available scientific evidence and expert opinions were consolidated into 74 recommendations.

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Article Synopsis
  • Craniopharyngiomas are rare tumors that make up about 80% of childhood tumors in the hypothalamic-pituitary region, which can lead to significant long-term health issues despite their benign nature.
  • Their location near critical brain structures like the visual pathways, hypothalamus, and pituitary gland complicates treatment and can result in neuroendocrine problems, even though survival rates are generally high.
  • In response to varying treatment approaches, a national initiative in the UK aims to create standardized, evidence-based guidelines for managing these tumors in children, developed by key medical organizations and using a specific methodology for consistency in care.
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The purpose of the current study was to compare outcomes of diclofenac versus corticosteroids following strabismus surgery. A systematic review and meta-analysis were performed in line with the Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines. An electronic search was performed to include comparative studies of diclofenac versus corticosteroids following strabismus surgery.

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Background: The aim of the project was to identify risk factors associated with visual progression and treatment indications in pediatric patients with neurofibromatosis type 1 associated optic pathway glioma (NF1-OPG).

Methods: A multidisciplinary expert group consisting of ophthalmologists, pediatric neuro-oncologists, neurofibromatosis specialists, and neuro-radiologists involved in therapy trials assembled a cohort of children with NF1-OPG from 6 European countries with complete clinical, imaging, and visual outcome datasets. Using methods developed during a consensus workshop, visual and imaging data were reviewed by the expert team and analyzed to identify associations between factors at diagnosis with visual and imaging outcomes.

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Objective: To provide a systematic approach to the child with a new squint.

Method: Review of the current available literature.

Conclusion: Squint is a common presentation in the paediatric population.

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Aim: To report the clinical features and surgical outcomes of one patient with heavy eye syndrome who underwent bilateral, unaugmented, full loop myopexy.

Methods: A 47-year-old lady with high myopia, high axial length, progressive esotropia, slippage of the lateral rectus (LR) inferiorly and superior rectus (SR) medially on magnetic resonance imaging (MRI) was diagnosed with heavy eye syndrome. Unaugmented loop myopexy without medial rectus (MR) recession was offered.

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Aims: To report visual acuity (VA) outcomes following chemotherapy for optic pathway glioma (OPG) in children with or without neurofibromatosis type-1 (NF1) and to analyse associated risk factors.

Methods: A prospective, multicentre, cohort study involving 155 children treated between September 2004 and December 2012. Initial and final VA was used for per-eye and per-subject analysis.

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Background: Diagnostic delay results in relatively high mortality among children with retinoblastoma in Uganda, where treatment was limited to surgery and, for some, radiotherapy. In order to improve outcomes, a simple programme of neoadjuvant and adjuvant chemotherapy was introduced. Here we report survival before and after this change to medical practice.

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Aims: To characterise the clinical features, treatment and outcome of children diagnosed with retinoblastoma in Uganda.

Methods: The study comprised a 6-year nationwide enrolment with follow-up.

Results: In total, 282 cases were enrolled, 26% (72) were bilateral; 6% were lost to follow-up.

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We present our experience over the long-term of monitoring of visual function in children with craniopharyngioma. Our study involves an analysis of all paediatric patients with craniopharyngioma younger than 16 at the time of diagnosis and represents a series of predominantly sub-totally resected tumours. Visual data, of multiple modality, of the paediatric patients was collected.

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Congenital stationary night blindness (CSNB) is a heterogeneous retinal disorder characterized by visual impairment under low light conditions. This disorder is due to a signal transmission defect from rod photoreceptors to adjacent bipolar cells in the retina. Two forms can be distinguished clinically, complete CSNB (cCSNB) or incomplete CSNB; the two forms are distinguished on the basis of the affected signaling pathway.

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Purpose: Strabismus is a common eye disorder with a prevalence of 1% to 4%. Comitant strabismus accounts for approximately 75% of all strabismus, yet more is known about the less common incomitant disorders. Comitant strabismus is at least partly inherited, but only one recessive genetic susceptibility locus, on chromosome 7p, has been identified in one family.

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Two cases of hemorrhagic retinopathy of prematurity associated with thrombocytopenia are presented. The negative prognosis of vitreous hemorrhage in retinopathy of prematurity and the option of platelet transfusions are discussed.

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Purpose: To identify the locus responsible for rge (retinopathy globe enlarged) in chickens and further characterise the rge phenotype.

Methods: A colony of chickens carrying the rge mutation was rederived from a single heterozygous animal of the original line. The eyes of blind, heterozygous and normal birds were subjected to ophthalmic, morphometric and histopathological examination to confirm and extend published observations.

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Article Synopsis
  • The study aims to identify the genetic location of the rdd mutation causing blindness in chickens, and to further understand the related visual impairment symptoms.
  • Through various examinations including ophthalmic and genetic mapping techniques, the researchers observed that rdd homozygotes exhibit significant vision loss, with morphological abnormalities developing as they age.
  • The findings indicate that the rdd mutation is sex-linked and mapped to a specific region of the chicken Z chromosome, which is similar to regions associated with human retinitis pigmentosa, suggesting potential candidate genes involved in the disease.
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