1/79. Laparoscopic treatment of retroperitoneal benign schwannoma.PURPOSE/methods: We report on a case of retroperitoneal benign schwannoma treated by laparoscopic surgery. RESULTS/DISCUSSION: The difficulties of diagnosis and the advantages of laparoscopic management are discussed.- - - - - - - - - - ranking = 1keywords = schwannoma (Clic here for more details about this article) |
2/79. Laparoscopic resection of a retroperitoneal schwannoma.Although laparoscopic surgery for retroperitoneal diseases has been widely performed, there are few reports of laparoscopic resection for retroperitoneal tumors. We present the case of a 5-cm retroperitoneal tumor compressing the right common iliac vein and inferior vena cava that was successfully resected using a laparoscopic technique. dissection between the tumor and the large vessels was performed safely using a harmonic scalpel and an ultrasonic surgical aspirator. Histopathology of the resected tumor showed a benign schwannoma. Laparoscopic surgical techniques should be considered for treatment of selected retroperitoneal tumors.- - - - - - - - - - ranking = 1keywords = schwannoma (Clic here for more details about this article) |
3/79. Retroperitoneal schwannoma presenting as an adrenal tumor.A retroperitoneal tumor in the region of the adrenal gland was diagnosed in a 56-year-old woman. The patient had been suffering from a dull abdominal pain for nearly four weeks before consulting her family physician. Ultrasound, CT and MRI scans revealed a giant tumor of the right adrenal gland. Endocrine activity could not be demonstrated. The size of the tumor was suggestive of an adrenal carcinoma. The patient was referred for adrenalectomy and complete exstirpation of the retroperitoneal mass. The histological examination revealed characteristical findings of a benign schwannoma.- - - - - - - - - - ranking = 1keywords = schwannoma (Clic here for more details about this article) |
4/79. 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 = schwannoma (Clic here for more details about this article) |
5/79. Extensive cytogenetic heterogeneity in a benign retroperitoneal schwannoma.A benign retroperitoneal schwannoma from a patient without prior exposure to radiotherapy or chemotherapy was analyzed by chromosome banding after short-term culture. An extensive intratumor heterogeneity in the form of 29 karyotypically related as well as unrelated clones was found. The aberrant clones were diploid or near-diploid and displayed both numerical and structural changes. All chromosomes, except 11, 16, and 20, were affected. Numerical changes included trisomies X, 7, 9, 17, and 18, and monosomies 13 and 18. No clonal loss of chromosome 22, the most characteristic abnormality in schwannomas of other locations, was, however, detected. The structural aberrations resulted in a total of 58 chromosomal breakpoints, with chromosomes 18, 1, and 15 participating in rearrangements most frequently, followed by chromosomes 14, 2, and 22. A striking finding was the clonal involvement of 18p11 in eight rearrangements affecting different chromosomes, suggesting alteration of telomeric function. The molecular mechanisms underlying the observed massive polyclonality in the schwannoma, particularly the presence of cytogenetically unrelated clones, are unknown and probably heterogeneous.- - - - - - - - - - ranking = 1.4keywords = schwannoma (Clic here for more details about this article) |
6/79. Presacral schwannoma with purely cystic form.STUDY DESIGN: Case report. OBJECTIVE: To point out that presacral schwannoma can display markedly cystic degeneration. SUMMARY OF BACKGROUND DATA: Benign schwannoma sometimes displays degenerative changes, such as cyst formation, calcification, hemorrhage, and hyalinization. Usually these degenerations are partially seen in the tumors. methods: Medical history, physical findings, imaging features, and histologic findings were reviewed in a case with a large presacral schwannoma. RESULTS: A 62-year-old woman presented with an 18-month history of right sciatic pain. Magnetic resonance images detected a large cystic, presacral tumor. Initially the tumor was misdiagnosed as a cystic ovarian tumor. Preoperative diagnostic workup led to the diagnosis of cystic schwannoma. Intralesional curettage achieved good pain relief. CONCLUSIONS: This tumor was unusual in its totally cystic appearance and resemblance to a cystic ovarian tumor or anterior sacral meningocele. Preoperative diagnosis is important to prevent major neurologic deficit at surgery.- - - - - - - - - - ranking = 1.6keywords = schwannoma (Clic here for more details about this article) |
7/79. Anterior abdominal wall malignant peripheral nerve sheath tumor in an infant.Malignant peripheral nerve sheath tumors (MPNST), also known as malignant schwannomas, are highly malignant lesions that tend to arise in the head and neck region or on the extremities, and only rarely in the retroperitoneum. These tumors are not common in children. Almost 50% of cases are associated with neurofibromatosis. When these neoplasms arise in the retroperitoneum, they usually are difficult to diagnose and to treat. Although various radiologic imaging methods are helpful for identifying some features of the mass, definitive diagnosis requires histologic examination and immunohistochemical staining. After treatment, the tumor recurs in 25% of patients. Five-year survival rates as high as 80% have been reported. Total excision, lack of invasion of surrounding tissues and vessels, and absence of neurofibromatosis, are features associated with better outcome. The authors present the case of a 1-month-old boy who had malignant schwannoma diagnosed in a unique location over the peritoneum of the anterior abdomen. The location and rapid growth of the tumor permitted early identification and total excision. J Pediatr Surg 36:1866-1868.- - - - - - - - - - ranking = 0.4keywords = schwannoma (Clic here for more details about this article) |
8/79. Retroperitoneal ancient schwannoma: case report and analysis of clinico-radiological findings.Ancient schwannoma is a rare subtype of typical schwannoma, with histological predominance of degenerative findings. We report the second case of retroperitoneal ancient schwannoma (occurred in a 45-year-old female referred to our institution for an unremitting right lumbar pain) and pinpoint clinical, radiological, prognosis and therapeutic aspects of this tumor.- - - - - - - - - - ranking = 1.4keywords = schwannoma (Clic here for more details about this article) |
9/79. Retroperitoneal schwannoma extending into the intravertebral foramen.A 35-year-old Japanese man first visited the hospital for episodes of numbness in the right medial femoral region and loss of muscular strength in the right thigh. A CT scan of the abdomen showed a 10 x 9-cm well-circumscribed in homogeneous multilayered mass, in contact with the lumbar vertebrae. MRI demonstrated a hypodense and hyperdense mixed mass. Tumor extension into the L(2)/L(3) intravertebral foramen was shown. To avoid spinal cord damage, we chose enucleation of the tumor in the intravertebral foramen. A follow-up CT after 1 year showed no evidence of a recurrent mass. In conclusion, we advocate the nerve-sparing operation in cases like that of our patient.- - - - - - - - - - ranking = 0.8keywords = schwannoma (Clic here for more details about this article) |
10/79. Retroperitoneal schwannoma misdiagnosed as a psoas abscess: report of a case.A retroperitoneal cystic mass compressing the right psoas muscle was found incidentally by ultrasonography in a 67-year-old woman. The radiological findings and a history of costal caries led us to suspect a psoas cold abscess. Ultrasound-guided needle aspiration was done to establish the diagnosis and to drain the content, but only a small amount of sterile fluid was obtained. The patient complained of neuralgia in her right leg at the time of puncture. Under the preoperative diagnosis of a neurogenic tumor, the mass was surgically resected, and found to be filled with old blood. The solid region consisted of a proliferation of fusiform cells, leading to a diagnosis of benign schwannoma. Retroperitoneal schwannoma is often misdiagnosed as an adjacent anatomical structure. Thus, we conclude that both microbiological and cytological examination of an aspiration specimen is important when psoas abscess is considered in a differential diagnosis.- - - - - - - - - - ranking = 1.2keywords = schwannoma (Clic here for more details about this article) |
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