Publications by authors named "Masafumi Ohki"

Nerve damage and intraoperative bleeding for the removal of the hilar stones are possible. We used the new modified lateral oral floor approach with a 2-3 cm longitudinal mucosal incision outside of the Wharton's. There were no complications and our technique seemed to be effective.

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To facilitate more reliable recordings of the ocular vestibular evoked myogenic potentials (oVEMP) induced by bone-conducted sound using the B81 bone conduction transducer, we preliminarily studied the effects of external auditory meatus occlusion using an earplug on such oVEMP. Eight healthy volunteers (four males and four females, 26-48 years of age, mean age: 34. 5 years) and 14 patients with vestibular disease (2 males and 12 females, 18-59 years of age, mean age: 41.

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Objective: To describe the first case of congenital external auditory canal cholesteatoma resected via a transcanal endoscopic approach and describe the possible pathologenesis of cholesteatoma.

Patient: A 2-year-old female patient presented with a cholesteatoma that extended from the floor of the external auditory bony canal to the inferior quadrant of her right tympanic membrane.

Intervention: Otological examinations and computed tomography were performed.

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To compare the outcomes of various surgical approaches to resect sinonasal inverted papilloma and to discuss their advantages and disadvantages. A retrospective chart review of 61 consecutive patients with sinonasal inverted papilloma was performed. Surgical treatment included non-demucosation endoscopic sinus surgery (ESS), demucosation ESS, endonasal medial maxillectomy (EMM), Draf type 3, Caldwell-Luc surgery, Denker, Killian, and lateral rhinotomy.

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Objectives: The purpose of this study is to determine the effects of various prognostic factors for early glottic cancer patients who underwent radiotherapy.

Methods: We retrospectively reviewed the all patients who were treated at our hospital for early glottic squamous cell carcinoma from 2004 to 2016. Data included patient's age, sex, T classification, tumor size, pathological grade, anterior commissure involvement, subglottic extension, laryngeal ventricle involvement, and restriction of vocal cord movement.

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We present a case of the transcanal endoscopic resection of a glomus tympanicum tumor. A 51-year-old woman presented with pulsatile tinnitus of the right ear persisting for 6 months. A reddish mass was observed through her tympanic membrane.

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Purpose: The absorbed dose at the image receptor in digital X-ray systems increases with an incorrect adjustment of the X-ray tube current-time product (mAs). Accordingly, the exposure index, target exposure index, and deviation index (DI) are proposed as absorbed dose optimization tools. We aimed at reducing the variation of DI in a short period by employing the mAs value determined by previously used mAs and DI.

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The tumors derived of the ceruminous gland in the external auditory canal are rare. Here, we report a case of a ceruminous adenoma (apocrine adenoma) with refractory chronic inflammation in the external auditory canal. A 46-year-old man presented with otorrhea, itching, and a foreign body sensation in his right ear.

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Objective: To compare surgical outcomes after tympanoplasty without ossiculoplasty for chronic otitis media between transcanal endoscopic ear surgery (TEES) and postauricular microscopic ear surgery (PAMES).

Study Design: Case-control study.

Setting: Tertiary care university hospital.

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Purpose: The purpose of our study was to evaluate the usefulness of a biocompatible class VI resin PolyJet photopolymer Objet MED610 (MED610)-made mouthpiece fabricated using a 3D printer as a fixation device for head and neck radiotherapy patients.

Methods: Five mouthpieces made of GC Exafine putty type (GCEP) were fabricated from five dry skull bones. After computed tomography reconstruction of the GCEP-made mouthpiece and its surface extraction, the MED610-made mouthpieces were replicated.

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A growing number of treatment options and active compounds in treatments have led to better outcomes for patients with advanced or recurrent epithelial ovarian cancer. We examined the association between progression-free survival (PFS), post-progression survival (PPS) and overall survival (OS) in phase III trials of second- and third-line chemotherapy for advanced or recurrent epithelial ovarian cancer. We aim to determine whether PFS or PPS is a surrogate of OS so that we can decide progress of disease is optimal endpoint for ovarian cancer.

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Pemphigus vulgaris is an autoimmune blistering disorder that involves the skin and mucous membranes. Few reports have described nasal and oropharyngolaryngeal lesions in pemphigus vulgaris using an endoscopic ororhinolaryngologic examination. We retrospectively reviewed the clinical records of 11 patients with pemphigus vulgaris between 2001 and 2013 with respect to their symptoms, lesion sites, lesion features, and treatments received.

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Bullous pemphigoid is an autoimmune bullous disease characterized by skin lesions, with or without oral lesions. The occurrence of pharyngolaryngeal lesions is very rare in affected patients. We conducted a study to investigate the characteristics of oral and pharyngolaryngeal lesions in bullous pemphigoid.

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We investigated the feasibility of patient dose reduction based on six noise suppression filters for cone-beam computed tomography (CBCT) in an image-guided patient positioning (IGPP) system. A midpoint dose was employed as a patient dose index. First, a reference dose (RD) and low-dose (LD)-CBCT images were acquired with a reference dose and various low doses.

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We carried out a retrospective review of 285 cases of acute epiglottitis (180 males, 105 females, mean age 49.6 years) that required inpatients hospital care between 1998 and 2014. All the patients complained of sore throat, and 62 patients complained of respiratory discomfort; 17 patients had severe dyspnea, and 27 patients required airway management (tracheotomy in 25, cricothyroidotomy in 2 patients).

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In this article we describe 5 rare cases of mumps-associated pharyngolaryngeal edema. To the best of our knowledge, this report includes the first case of mumps-associated pharyngolaryngeal edema in a patient who had previously received mumps vaccination, and these cases represent the sixth report of mumps-associated pharyngolaryngeal edema in the English literature. All 5 of our patients with mumps infection were adults and manifested airway stenosis due to pharyngolaryngeal edema.

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Pharyngeal tuberculosis is a rare disease, and its commonly reported symptoms include sore throat, dysphagia, and throat discomfort. The dysphagia in pharyngeal tuberculosis cases is not due to pharyngolaryngeal paralysis but due to odynophagia. Herein, we describe the first case of dysphagia caused by pharyngolaryngeal paralysis secondary to pharyngeal tuberculosis.

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In Japan, seasonal allergic rhinitis in the spring due to exposure to Japanese cedar or Japanese cypress pollen is common. However, the allergic profile for perennial allergens in spring pollinosis remains unclear. Therefore, in this study, we investigated the allergic profiles of 652 patients with rhinitis.

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Multiple studies have demonstrated alterations in excitability in the central nervous system after peripheral nerve injury. However, there are few reports on changes in the central nervous system after peripheral facial nerve injury. Our objective was to determine the excitability changes that occur in the facial nucleus after facial nerve impairment.

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We investigated the effect of the readout direction of the edge profile obtained by the edge method on the presampled modulation transfer function (MTF) in various computed radiographic (CR) systems. There were no differences in the MTFs derived from two edge profiles in the sub-scanning direction of four CR systems used in this study. On the other hand, the MTFs measured at a readout direction from the low (edge) to the high (direct exposure) exposure region were higher than those measured at a readout direction from the high to the low exposure region in the laser-beam scanning direction for three of the four CR systems.

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Objective: To describe the clinical course and treatment of a patient presenting with thrombophlebitis of the head and the neck with eosinophilic otitis media (EOM).

Patient: The patient was a 32-year-old woman with bronchial asthma and chronic sinusitis. She was treated for EOM, which presented as intractable otitis media with viscous effusion.

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The purpose of this study was to develop a computer-aided method for determination of beam arrangements based on similar cases in a radiotherapy treatment-planning database for stereotactic lung radiation therapy. Similar-case-based beam arrangements were automatically determined based on the following two steps. First, the five most similar cases were searched, based on geometrical features related to the location, size and shape of the planning target volume, lung and spinal cord.

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This is the first report of objective tinnitus presenting as audible spontaneous otoacoustic emission in a patient with tuberous sclerosis. The tinnitus was loud, continuous, and high pitched: 7757.8 and 6257.

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