نتایج جستجو برای: malignant schwannoma

تعداد نتایج: 216128  

2013
Ju Young Jang Jin Se Kim Ju Won Choe Mi Kyung Kim Jae Woo Jung Jae Chol Choi Jong Wook Shin In Won Park Byoung Whui Choi Jae Yeol Kim

Benign schwannoma is the most common neurogenic tumor in the mediastinum. Mediastinal benign schwannomas are most often asymptomatic and rarely accompanied by bloody pleural effusion. In the clinical analysis of 7 cases of pulmonary schwannomas, pleural effusion, and blood invasion were evident in 3 patients with malignant schwannoma. Herein, we report a rare case of giant, benign schwannoma pr...

Journal: :Human pathology 1949
Thomas

Most nerve tumors (benign and malignant) do not arise from the nerves per se, but from the supporting cells; tumors arising from the cells of Schwann are termed schwannoma or neurilemmoma-benign or malignant. Surgical extirpation is the most effective treatment for these tumors. Radiation therapy can offer significant palliation and prolongation of life, but no cures have been observed. Benign ...

Journal: :Archives of ophthalmology 1999
S I Khwarg M J Lucarelli B N Lemke M E Smith D M Albert

The ancient schwannoma is a rare variant of a neurilemoma with a course typical of a slow-growing benign neoplasm. Histologically, it can be confused with a malignant mesenchymal tumor because of increased cellularity, nuclear pleomorphism, and hyperchromatism. Despite the degree of nuclear atypia, mitotic figures are absent. We describe the clinical and histopathologic features of an ancient s...

Journal: :Brazilian journal of otorhinolaryngology 2012
Sharlene Castanheira Pádua Vítor Yamashiro Rocha Soares André Luís de Queiroz Márcio Nakanishi Luiz Augusto Nascimento

1 Graduation (Otorhinolaryngologist, Brasília University). 2 Graduation (Otorhinolaryngology Medical Resident, Brasília University). 3 Graduation (Assistant Professor, Department of Otorhinolaryngology and Head and Neck Surgery, Brasília University). 4 PhD in Sciences, ENT Department, University of São Paulo (Adjunct Professor, Department of Otorhinolaryngology and Head and Neck Surgery, Brasíl...

2017
Philippe F Bowles Ryan Chin Taw Cheong Samuel Cartwright Andrew Pelser

Ancient schwannomas exhibit characteristic histological features. Fine-needle aspiration cytology (FNAC) is of limited use. Radiological evidence demonstrating displacement of blood vessels may aid diagnosis of schwannoma. Malignant transformation of ancient schwannoma has been reported. Surgical excision carries a high risk of postoperative Horner's syndrome.

Journal: :Bratislavske lekarske listy 2012
A De Stefano G Kulamarva L Citraro L Borgia A Croce

PROBLEMS/OBJECTIVES Malignant peripheral nerve sheath tumours are uncommon soft tissue tumours originating from Schwann cells or nerve sheath cells. Malignant epithelioid schwannoma is an aggressive variant of malignant peripheral nerve sheath tumour, and unfortunately is related with a high rate of recurrence and poor prognosis. METHODOLOGY In this study we present a rare case of malignant e...

Journal: :Hellenic journal of nuclear medicine 2015
Yiqiu Zhang Beilei Li Liang Cai Xiaoguang Hou Hongcheng Shi Jun Hou

Gastric Schwannoma is a rare benign mesenchymal tumor that accounts for only 0.2% of all gastric tumors. The current study presents a case of gastric Schwannoma misdiagnosed as malignant gastrointestinal stromal tumor (GIST) by esophagogastroduodenoscopy, endoscopic ultrasonography, and contrast-enhanced or not enhanced and (18)F-FDG PET/CT imaging.

2015
Fatih Akdemir Emrah Okulu

Retroperitoneal ancient schwannoma is a quite uncommon tumor of the peripheral nerve sheaths. Despite its benign course, it may also display malignant behavior. Herein, we presented a retroperitoneal ancient schwannoma case together with clinical, radiological and pathological characteristics of the disease, which had been detected incidentally via ultrasonography in a 24-year-old patient with ...

2016
Oktay Karaköse Hüseyin Pülat Serhat Oğuz İsmail Zihni Kazım Çağlar Özçelik Tülin Deniz Yalta Hüseyin Eken

INTRODUCTION Ancient schwannoma is a rare tumor of the peripheral nerve sheath. As degenerative properties are defined histologically, it can be wrongly interpreted as malignant. CASE PRESENTATION The case presented here is of a giant ancient schwannoma with a pelvic retroperitoneal location, which was mimicking an adnexal mass. CONCLUSION In the rarely seen cases in the retroperitoneum, it...

2016
Sung Jin Oh Byoung Jo Suh Jong Kwon Park

A schwannoma is a kind of neurogenic tumor that rarely occurs in the gastrointestinal tract. Gastric schwannomas make up 0.2% of all gastric neoplasms. Gastrointestinal stromal tumors (GIST) are the most common mesenchymal tumors and up to 60-70% of GIST occur in the stomach. Schwannoma and GIST are similar in clinical features, so they are difficult to differentiate preoperatively. Differentia...

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