1/16. Giant ancient schwannoma of the pelvis.A 43-year-old man with a large ancient schwannoma of the pelvis, presenting with varicose veins, is reported. Ancient schwannoma (neurilemmoma) is a benign tumour of nerve sheath origin characterised histologically by features of severe degeneration and which rarely can grow to a large size. Malignant transformation, though reported, is extremely rare.- - - - - - - - - - ranking = 1keywords = schwannoma (Clic here for more details about this article) |
2/16. Treatment of giant ancient pelvic schwannoma.A 32-year-old patient presented with urinary retention and chronic constipation. Computerized tomography and magnetic resonance imaging showed a 10 x 11cm encapsulated tumor with cystic areas lying ventral to the sacrum. There was no evidence of invasion of bladder or rectum. At laparotomy, a 10 x 11 cm mass was found in the left pelvis. Final pathology revealed an ancient schwannoma. In most large series, 80% to 90% of the primary retroperitoneal tumors are malignant. Retroperitoneal schwannomas can be benign or malignant, roughly half of the reported cases showed malignancy. Benign schwannomas may arise along the course of any myelinated nerve, with the acoustic neuroma being the most frequent site. Immunostaining showed a strong expression of S-100 protein. The staining for this protein is helpful for differentiation of a benign schwannoma from a malignant peripheral nerve sheath tumor and from other benign spindle cell tumors. The treatment of choice for benign schwannomas is complete excision. recurrence or persistence seems to be associated with incomplete resection, which occurred in 10% of the reported cases. After surgery, the patient had normal erection, normal micturition, and normal defecation but no symptoms of motor and sensory disturbances.- - - - - - - - - - ranking = 1.5keywords = schwannoma (Clic here for more details about this article) |
3/16. Chronic sciatica secondary to retroperitoneal pelvic schwannoma.Pelvic schwannoma is a rare cause of sciatic pain. We report a case of retroperitoneal pelvic schwannoma presenting with chronic sciatica which was diagnosed and monitored radiologically for several years before successful surgical resection.- - - - - - - - - - ranking = 1keywords = schwannoma (Clic here for more details about this article) |
4/16. Resection of a pelvic schwannoma with partial removal of the sacral nerve root.Because the symptoms do not appear in most cases until the tumor has grown quite large, schwannomas are often detected incidentally during work-up for some other condition. Benign schwannomas generally do not invade adjacent structures but making the diagnosis preoperatively can be difficult when the tumor is large. We report the case of a benign schwannoma which was diagnosed preoperatively by needle core biopsy under computed tomography guidance. The tumor was removed completely by partially resecting the S1 nerve root, which was subsequently reanastomosed. The postoperative course was uneventful with the exception of minimal left leg pain due to neurologic deficit.- - - - - - - - - - ranking = 1.1666666666667keywords = schwannoma (Clic here for more details about this article) |
5/16. Presacral cystic schwannoma in a man.Presacral cystic schwannomas are rare, difficult to diagnose, and have only been reported in women. We present the first such case in a male patient. It was incidentally diagnosed during an evaluation for renal colic in a 52-year-old man. The presacral lesion was cystic on computed tomography and measured 10 cm in diameter. The appearance on pelvic magnetic resonance imaging was hyperintense on T(2)-weighted images and of low to intermediate intensity on T(1)-weighted images. Complete excision was achieved without bladder injury. The patient voided without difficulty and was free of local recurrence at 12 months after surgery.- - - - - - - - - - ranking = 0.83333333333333keywords = schwannoma (Clic here for more details about this article) |
6/16. Unusual presentation of an abdominoinguinal schwannoma.Schwannoma is a rare, benign peripheral nerve sheath tumor of uncertain origin.This report describes a retroperitoneal cellular schwannoma that extended into the inguinal region. Surgical dissection of a tumor in this site requires an abdominopelvic approach. histology revealed nodules of pale epithelioid cells separated by fascicles of spindle cells. With immunohistochemistry, no actin was seen. Neurospecific vimentin confirmed the presence of nerve cells. The tumor was completely removed, and as of 6 months later there had been no recurrence.Schwannoma are extremely difficult or even impossible to diagnose preoperatively. If clinicians are faced with an inguinal swelling or herniation and a coexisting abdominal mass, they should perhaps consider radiologic studies that better identify the origin.- - - - - - - - - - ranking = 0.83333333333333keywords = schwannoma (Clic here for more details about this article) |
7/16. Pelvic ring reconstruction with a vascularized pedicle iliac bone graft for a large sacral schwannoma.A case of pelvic ring reconstruction with a vascularized pedicle iliac bone graft for removal of a huge sacral schwannoma is reported. It is necessary to reconstruct a pelvic ring when its integrity is impaired. Spinal instrumentation is essential for a temporary stability of the pelvic ring in the course of complete healing, which at times results in instrumentation failure. Several cases of pelvic ring reconstruction using vascularized fibular bone grafts have also indicated positive results attributable to their good blood circulation, but techniques with them are relatively complicated. We applied a vascularized pedicle iliac bone graft to the pelvic ring reconstruction after resection of a huge sacral schwannoma. When a stable pelvic ring was regained by using a lumbosacral instrumentation technique, a tricortical iliac bone graft with its vascular pedicle was harvested, transported into the dead space, and tied to the right residual sacrum and the left ilium. The vascularized graft healed rapidly, and continuity of the pelvic ring was regained. This method is effective for pelvic ring reconstruction in that it does not require microvascular techniques and rapid bone healing can be obtained.- - - - - - - - - - ranking = 1keywords = schwannoma (Clic here for more details about this article) |
8/16. Laparoscopic resection of presacral schwannomas.Presacral tumors are particularly rare in the adult. Schwannomas are neurogenic neoplasms, rarely occurring in the retroperitoneum and the pelvis. Presented herein are the cases of 2 female patients with chronic pelvic pain who were discovered to have presacral schwannomas and were managed laparoscopically. laparoscopy is a safe and efficient option in approaching benign pelvic tumors and might offer the advantage of better visualization of structures due to the magnification of laparoscopic view, especially in narrow anatomic spaces.- - - - - - - - - - ranking = 0.83333333333333keywords = schwannoma (Clic here for more details about this article) |
9/16. Large presacral schwannoma after radical prostatectomy.A 56-year-old man presented with long-standing, mild urinary frequency 6 years after radical prostatectomy. Pathologic assessment showed presence of organ confined prostate cancer (pT2a), Gleason 6 (3 3). Since the time of surgery, PSA level was undetectable and the patient remained without evidence of recurrent disease. However, digital rectal examination revealed the presence of a very large mass palpable on the anterior rectal wall. Therefore, the patient underwent abdominal/pelvic MRI which demonstrated presence of a solid, well-circumscribed pelvic mass extending from the level of the sacrum posteriorly to the anterior abdominal wall. Histologic examination of percutaneous biopsy of the mass was suggestive of schwannoma. The patient underwent laparotomic excision of the mass, which was confirmed to be a schwannoma, with its characteristic slender spill cells and elongate nuclei. No intra-operative complication was reported. The patient has no evidence of recurrence with complete resolution of urinary symptom one year after surgery.- - - - - - - - - - ranking = 1keywords = schwannoma (Clic here for more details about this article) |
10/16. Infravesical obstruction caused by a retrovesical malignant schwannoma.A 77-year-old male presented himself with acute urinary retention, and a history of infravesical obstruction. Cystourethroscopy failed to show the obstruction. A malignant schwannoma (MS) causing impression in the bladder was removed through a laparotomy. Postoperatively there were no urologic symptoms, and the urodynamic investigations had changed to normal.- - - - - - - - - - ranking = 0.83333333333333keywords = schwannoma (Clic here for more details about this article) |
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