Publications by authors named "Ronald O B De Keizer"

Background: For the selective detection of thyroid-stimulating hormone receptor antibodies with stimulating properties (thyroid-stimulating immunoglobulins; TSI), a novel and rapid bioassay (Turbo TSI) has been introduced. We evaluate the clinical performance of Turbo TSI in Graves' orbitopathy (GO) patients and compare it to a bridge-based TSI binding immunoassay and third generation TSH-R-binding inhibitory immunoglobulins (TBII) assay. Also, we investigate the association of Turbo TSI and TBII measurements with GO activity and severity, as well as response to intravenous methylprednisolone (IVMP), and compare results to previous findings on the bridge-based TSI binding immunoassay.

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Background: Thyroid stimulating immunoglobulins (TSI) play a central role in the pathogenesis of Graves' orbitopathy (GO), while soluble interleukin-2 receptor (sIL-2R) is a marker for T-cell activity. We investigated TSI and sIL-2R levels in relation to thyroid function, disease activity and severity and response to treatment with intravenous methylprednisolone (IVMP) in patients with GO.

Methods: TSI (bridge-based TSI binding assay), sIL-2R, TSH and fT4 levels were measured in biobank serum samples from 111 GO patients (37 male, 74 female; mean age 49.

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Introduction: MRI of extra-ocular muscles (EOM) in patients with myasthenia gravis (MG) could aid in diagnosis and provide insights in therapy-resistant ophthalmoplegia. We used quantitative MRI to study the EOM in MG, healthy and disease controls, including Graves' ophthalmopathy (GO), oculopharyngeal muscular dystrophy (OPMD) and chronic progressive external ophthalmoplegia (CPEO).

Methods: Twenty recently diagnosed MG (59±19yrs), nineteen chronic MG (51±16yrs), fourteen seronegative MG (57±9yrs) and sixteen healthy controls (54±13yrs) were included.

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Purpose: Orbital exenteration of periocular tumors complicated by orbital invasion is a heavy burden for patients and leads to disfiguring cosmesis and loss of vision. Here, we report our experience with globe-sparing surgery in a series of patients with periocular malignancies other than basal cell carcinoma (BCC), all exhibiting anterior orbital invasion.

Methods: In this consecutive case series, we examined medical records of all patients between 2000 and 2018 with periocular malignancies (other than BCC) invading the anterior orbit (without extraocular muscle or scleral invasion) treated by one orbital surgeon (DP).

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An Ocular Sebaceous Carcinoma (OSC) is a rare malignant tumor for which initial clinical and pathological diagnosis is often incorrect. OSCs can mimic Squamous Cell Carcinomas of the Conjunctiva (SCCC). The aim of this study was to find microRNA biomarkers to distinguish OSCs and SCCCs from normal tissue and from each other.

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Uveal melanoma (UM) is the second most frequent type of melanoma. Therapeutic options for UM favor minimally invasive techniques such as irradiation for vision preservation. As a consequence, no tumor material is obtained.

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Purpose: To demonstrate that long-circulating PEGylated liposomal prednisolone is a safe and effective therapy in patients with active moderate-to-severe Graves' orbitopathy.

Methods: Open-label, proof-of-concept, multicentre pilot study. Ten patients with moderate-to-severe Graves's orbitopathy, who were euthyroid for at least three months.

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Introduction: Anterior levator disinsertion/reinsertion and Müllerectomy (ALDM) is generally performed to correct upper eyelid retraction in patients with Graves' orbitopathy (GO). We studied the outcome of this procedure and its correlation with clinical parameters.

Patients And Methods: Retrospective analysis of results of ALDM in 305 consecutive euthyroid patients with burnt-out GO treated in our hospital between 1 January 2000 and 1 January 2016.

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Objective: To determine postoperative surgical site infection (SSI) rates in three separate patient groups who underwent orbital surgery without prophylactic systemic antibiotics.

Study Design: Single-centre retrospective descriptive case series.

Study Population: We studied the notes of 639 consecutive patients who had undergone orbital surgery in our hospital from 2009 through 2013.

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Purpose: To evaluate the clinical and histopathological characteristics of silent skin squamous cell carcinomas (SCC) with invasion routes to the orbit.

Methods: Retrospective case studies. Clinical records and histopathological material, therapy and complications were evaluated, together with MRI imaging analyses and literature review on the anatomy of the lateral orbital wall in relation to the zygomatico-temporal nerve channel.

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