1/69. Greater superficial petrosal nerve neurinoma. Case report.The authors report a case of middle cranial fossa neurinoma arising from the left greater superficial petrosal nerve in a 21-year-old woman who presented with a left-sided otitis media that chronically recurred over a period of 5 years. On examination, the patient had a left-sided mild conductive hearing impairment and a slight disturbance in tear secretion on the left side, with sensory disturbance in the left palate. Three-dimensional computerized tomography scans clearly demonstrated the enlargement of the foramen lacerum and foramen ovale, and heavily T2-weighted magnetic resonance images revealed the tumor's location along with the course of the greater superficial petrosal nerve and its extension into the tympanic cavity. Following complete surgical excision of the tumor and tympanoplasty via a middle cranial fossa approach, the patient retained useful hearing without facial palsy.- - - - - - - - - - ranking = 1keywords = cavity (Clic here for more details about this article) |
2/69. Incidental sampling of branchial remnants: a potential source of error in fine-needle aspiration of neck lesions-a case report.Remnants of the branchial apparatus can produce lesions in the head and neck region in later life, often amenable to fine-needle aspiration (FNA) diagnosis. Yet such remnants or rudimentary lesions can remain clinically undetected and can later interfere with the cytologic interpretation of other deep lesions of the neck, as the present case demonstrates. In this case the lesion, which by a subsequent resection turned out to be a neurilemmoma, had been adequately sampled by the FNA, yet the cytologic diagnosis was sidetracked by the presence in the specimen of immature squamous epithelial tissue fragments and other elements (multinucleated histiocytes, calcifications), on the basis of which the diagnosis of an epithelial lesion, likely malignant, was made. The neck surgery and a preceding endoscopic examination of the mouth, pharynx, and larynx did not identify such a lesion, but a detailed microscopic examination of the fibroadipose tissue between the tumor and the peripharyngeal region revealed the presence of epithelial microfragments with morphology partly corresponding to that of the FNA cytology, highly indicative of a branchiogenic lesion in the peripharyngeal region. The basic embryology of the branchial apparatus resulting in such defects is presented, as well as tentative guidelines for recognizing material deriving from accidental sampling of such lesions during FNA investigations of deep-seated masses of the neck. Diagn. Cytopathol. 2000;22:157-160.- - - - - - - - - - ranking = 0.11406270095146keywords = mouth (Clic here for more details about this article) |
3/69. Nerve stimulating system for peripheral nerve tumor resection under the thoracoscope.The authors report a newly devised nerve stimulator and its clinical application in thoracoscopic surgery. The stimulator is a monopolar system, that has a long extension between the electrodes and the handle. The stimulator is inserted into the chest cavity through a portal, and is used to distinguish motor nerves from the surrounding tissue and to determine whether there is nerve involvement with tumor. The tumor is then safely and rapidly resected by thoracoscopic technique and the major nerves are spared. This method was used in two clinical cases, with excellent results obtained, and with no major complications.- - - - - - - - - - ranking = 1keywords = cavity (Clic here for more details about this article) |
4/69. Jacobson's nerve schwannoma presenting as middle ear mass.Schwannoma is one of the common benign middle ear space tumors. Middle ear space schwannomas may originate from the nerves of the tympanic cavity or by extensions from outside the middle ear space. In the English-language literature, the facial nerve and chorda tympani nerve, but not yet the tympanic branch of glossopharyngeal nerve (Jacobson's nerve), have been reported as the origins of intrinsic middle ear space schwannomas. We present the clinical and radiologic features of a middle-space schwannoma originating from Jacobson's nerve, and suggest that such a tumor be included in the differential diagnosis of middle ear tumors.- - - - - - - - - - ranking = 1keywords = cavity (Clic here for more details about this article) |
5/69. Sinonasal mucosal malignant melanoma: report of an unusual case mimicking schwannoma.Primary mucosal melanoma of the sinonasal tract is a rare malignancy that has a more aggressive clinical course than its cutaneous counterpart. The histology of these lesions varies, with differing degrees of melanin production and an epithelioid or spindle-cell growth pattern. Cutaneous melanocytic lesions may differentiate in accordance with their neural crest derivation and express morphology similar to nerve sheath tumors. We believe the following case study reports the first instance of a mucosal melanoma with a Schwannian pattern of growth, arising from the nasal cavity of a 26-year-old man.- - - - - - - - - - ranking = 1keywords = cavity (Clic here for more details about this article) |
6/69. Cystic schwannoma of the orbit: case report.BACKGROUND: Cystic lesions of the orbit have diverse clinical findings and histopathological features. We report an orbital schwannoma composed of a single cyst. CASE DESCRIPTION: A 62-year-old woman with an intraconal cystic tumor in the left orbital cavity is described. The cystic tumor was totally removed and the pathological diagnosis of the cyst wall was schwannoma composed of both Antoni type A and B. CONCLUSIONS: A rare case of cystic schwannoma of the orbit is reported. This case may contribute to an improved preoperative differential diagnosis for cystic lesions of the orbit.- - - - - - - - - - ranking = 1keywords = cavity (Clic here for more details about this article) |
7/69. Neurinoma in the buccal mucosa.A 14-year-old girl was referred to our clinic with a problem of a painless slow growing lesion for approximately three years. MR imaging findings of lesion was "retention cyst of the salivary gland". Controversially, the histological examination of the total excised specimen was "neurinoma" and that was inconsistent with MR findings. Neural tissue tumors of the oral cavity are rare, however, this diagnosis was confirmed by surgical excision and histopathological examination. There was a rare location of the lesion as well.- - - - - - - - - - ranking = 6.8444543541428keywords = oral cavity, cavity (Clic here for more details about this article) |
8/69. Neurilemmomas of the paranasal sinuses.Within the head and neck region, neurilemmomas are rarely found in the nasal cavity or paranasal sinuses. A 70-year-old man presented with complaints of left-sided epiphora, rhinorrhea, epistaxis, and transient diplopia. Nasal endoscopy showed a large necrotic mass filling the left middle meatus. A computed tomography scan showed a large left ethmoid mass, with erosion of the medial wall of the orbit and the anterior cranial base. Multiple biopsies were nondiagnostic. Complete excision of the tumor was performed with endoscopic techniques. Small dural defects were repaired with a middle turbinate mucosal flap. Postoperatively, the patient was treated with nasal packing and a lumbar spinal drain. Final pathology showed a benign neurilemmoma. There has been no evidence of recurrence or cerebrospinal fluid leakage in follow-up. A review of the literature shows a similar presentation of patients with neurilemmomas of the paranasal sinuses. Bony destruction and intracranial extension is viewed. Lack of encapsulation and locally destructive growth in an otherwise histologically typical neurilemmoma should not suggest malignant potential. Many benign tumors of the paranasal sinuses with bone destruction may be removed by using endoscopic techniques.- - - - - - - - - - ranking = 1keywords = cavity (Clic here for more details about this article) |
9/69. Combined diagnostic imaging for retroperitoneal schwannoma.Retroperitoneal tumors are occasionally encountered by gynecologists, and differential diagnosis from adnexal tumors is important, however, it is difficult in many cases. We report a case in which we preoperatively diagnosed a benign solid tumor in the retroperitoneum of the pelvic cavity on the basis of a variety of diagnostic images, including FDG-PET. Postoperative histological examination showed a benign schwannoma in the pelvis. We discuss the usefulness of FDG-PET combined with MRI and other diagnostic images as a means of differentiating between the characteristics of retroperitoneal tumors.- - - - - - - - - - ranking = 1keywords = cavity (Clic here for more details about this article) |
10/69. Jacobson's nerve schwannoma: a rare middle ear mass.The case of a 55-year-old woman with a middle ear mass is presented. The preoperative diagnostic workup, including an audiogram and imaging studies, and the histopathologic findings of the tumor are reviewed. The tumor, a schwannoma, arose from Jacobson's nerve in the middle ear. The surgical anatomy of Jacobson's nerve and the surgical approach to this tumor and to other tumors of the middle ear space are discussed. Tumors of the tympanic cavity are rare, with the exception of cholesteatoma; otherwise, the most common among them are paraganglioma and facial nerve neuroma. This report represents the first documented case of a schannoma arising from Jacobson's nerve in the tympanic cavity.- - - - - - - - - - ranking = 2keywords = cavity (Clic here for more details about this article) |
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