313 research outputs found
Clinical Experience With a New Type of Rhino-Larynx Electronic Endoscope PENTAX VNL-1530
We observed recordings of pictures obtained from patients with diseases of the larynx by using a new type of rhino-larynx electronic endoscope, PENTAXVNL-1530 connected to a video processor, PENTAX
EPM-3300 (Asahi Optical Co., Ltd.). The electronic endoscope differs from the fiberoptic endoscope
in that it contains a small light-sensitive charge coupled device (CCD) chip that is attached
to the tip of the endoscope. This electronic endoscope has the smallest CCD camera of 5.1 mm in diameter,
in the tip portion, and can be passed through the nasal passage into the laryngeal cavity. The
dynamic image provided by this system is superior to that obtained by a flexible laryngofiberscope
in resolution of the detail
Squamous Cell Carcinoma With Sarcomatous Stroma of the Mesopharynx
A case of squamous cell carcinoma with sarcomatous stroma of the mesopharynx is
presented. The patient was a 62-year-old man who complained of a foreign body sensation. Endoscopic examination revealed a large pedunculated mass arising from the posterior wall of the mesopharynx. The lesion was surgically resected, using a cutting snare by the endo-oral approach, and was completely removed. A diagnosis of squamous cell carcinoma with sarcomatous stroma was made histopathologically. The clinicopathological features of this case are described and compared with those of previously reported cases
Electronic Videoendoscopy of Laryngeal Lesions Using a New Type of Rhinolarynx Endoscope Portion
Patients with laryngeal lesions were observed and the lesions were recorded with an
electronic videoendoscope system using the PENTAX EPM-3300 video processor and the
PENTAX VNL-1330 endoscope portion. The electronic videoendoscope system differs
from the conventional fiberoptic endoscope connected to a video camera in that a small
monochrome charge-coupled device (CCD) chip is built in the tip of the endoscope portion.
The PENTAX VNL-1330 rhinolarynx endoscope portion has a tip and insertion tube of
approximately 4mm in outer diameter to allow its introduction through the nasal passages
into the larynx. The dynamic color images provided by this system were superior to those
obtained by a conventional rhinolarynx flexible fiberscope connected to a video camera in
both quality and resolution of detail. This system should be useful in diagnosing laryngeal
lesions
Verrucous Carcinoma of the Larynx Presenting as a Hairy Whitish Tumor
A patient was encountered with verrucous carcinoma of the larynx that presented as a hairy whitish tumor. There was a recurrence because simple excision with forceps by endolaryngeal microsurgery was performed in the first operation. However, in the second operation endolaryngeal microscopic laser surgery using a direct laryngoscope was performed and followed by adjuvant chemotherapy with oral UFT, a combination of uracil and tegafur in a molar ratio of 4:1. The patient’s course has been favorable to date. The case is reported in this paper and discussed from the viewpoint of diagnosis and treatment of this neoplasm
Lymphoepithelial Cyst of the Hypopharynx
A rare case of lymphoepithelial cyst formed in the piriform sinus of the hypopharynx is reported. Histopathological examination revealed a lymphoepithelial cyst. It was removed by laryngomicrosurgical technique using a side-opened direct laryngoscope. Because this cyst was wide-based on the antero-medial region in the right piriform sinus of the hypopharynx, the mucous membrane around the cyst was incised electrosurgically and then detached to facilitate removal. In this paper, we describe our surgical procedure for removing the cyst in this case and discuss the possible causes of the disease
Initial Experience of Endoscopic Phonosurgery With a Prototype of the Therapeutic Rhinolarynx Electronic Endoscope
We performed endoscopic phonosurgery in a patient with a laryngeal lesion using a prototype of the therapeutic rhino-larynx electronic endoscope connected to a video processor (Asahi Optical Co.,
Ltd.). This therapeutic electronic endoscope differs from the fiberoptic endoscope, because it contains
an instrument channel and a miniature television camera attached to the tip of the endoscope,
consisting of a small light-sensitive CCD chip. The dynamic image provided by this system is superior
in resolution to that obtained by conventional flexible laryngofiberscopes. Using this therapeutic
electronic endoscope and flexible forceps, we succeeded in removing a vocal fold polyp. This
endoscope can be passed through the nasal passage into the laryngeal cavity. The therapeutic electronic
endoscope is introduced and a clinical case is presented
Conservative Therapy for Nonspecific Granuloma of the Larynx Using a Beclomethasone Dipropionate Inhaler
Nonspecific granuloma of the larynx is a benign tumor that usually occurs on the posterior
glottis. Conventional treatment for this laryngeal lesion has consisted of surgical
resection. However, this lesion has a strong tendency to recur postoperatively and may
require multiple repeated operative procedures. Conservative treatment, consisting
mainly of beclomethasone dipropionate inhalation therapy, was instituted in 20 cases
with good results. We discussed the effect of beclomethasone dipropionate on this lesion
as well as the etiology of this disease
Newly Designed Specula for Laryngomicroscopy
We produced specula for laryngomicroscopy to observe blind spots in the operating field. Use of these specula has facilitated detailed observation of the lower surface of the false vocal folds, laryngeal ventricle, and subglottis, which were previously in blind spots. The specula are useful in the following ways:
1) clarifying blind spots for improved diagnosis and providing more accurate surgical margins; 2) observing the lower lips of the vocal folds in phonosurgery; and 3) Vaporizing with laser reflection. The specula are cheap and easy to use and are well worth considering for application to laryngomicroscopy
マングローブ域におけるカニ類の分布とセルロース分解能との関係
学位の種別: 課程博士審査委員会委員 : (主査)東京大学教授 佐野 光彦, 東京大学教授 河村 知彦, 東京大学准教授 岡本 研, 東京大学准教授 山川 卓, 三重大学大学院生物資源学研究科准教授 木村 妙子University of Tokyo(東京大学
Low-grade osteosarcoma is predominant in gnathic osteosarcomas: A report of seven cases of osteosarcoma of the jaw
OBJECTIVE: Primary osteosarcoma of the jaw bones is very rare, and histological features of gnathic osteosarcoma remain obscure. The purpose of this study was to describe the clinicopathological features of gnathic osteosarcoma. MATERIALS AND METHODS: Seven cases of gnathic osteosarcoma from Japan diagnosed during the period between 2000 and 2016 were examined retrospectively. The histology of the surgical pathology materials was reviewed by two pathologists. Clinical information was obtained from the hospital's information system. RESULTS: Of the seven cases, two patients had secondary osteosarcomas. As for the five cases of primary osteosarcoma, their ages ranged from 26 to 58 years (mean: 36.2, median: 28). Histologically, three cases were fibrotic tumors composed of spindle‐shaped cells with mild to moderate nuclear atypia and the collagenous stroma accompanied by woven bones or mature lamellar‐like bones. Two cases had cartilage formation. MDM2 and CDK4 expression was observed in two out of three cases on immunostaining. The histopathology of these three cases was regarded as the counterpart of low‐grade osteosarcomas, namely, parosteal osteosarcoma and low‐grade central osteosarcoma, arising in long bones. CONCLUSIONS: The surprisingly high incidence (60%, 3/5 cases) of low‐grade osteosarcoma explains the reason why gnathic osteosarcomas present a more favorable prognosis than osteosarcomas arising in long bones. Furthermore, it provides insight into the tumorigenesis mechanism of low‐grade osteosarcomas arising in the jaw and other sites
- …