[Retroperitoneal benign schwannoma. Report of a new case]

[Retroperitoneal schwannoma]

Schwannomas, also called neurilemmomas, are a rare type of tumour in the body and even more rare in the retroperitoneal cavity. They arise from Schwann cells of the peripheral nerves. Retroperitoneal Schwannomas are rare and they account for 0.7 to 2.7% of all Schwannomas. They are slow growing tumours, and their location in the retroperitoneum is associated with poor clinical symptoms, and is often an incidental radiographic finding. Although it is a histologically benign tumour, we must not under-estimate the damage caused by compression of adjacent structures, as well as the rare but possible malignant transformation. We present this case as a casual finding after a systematic examination of the patient performed for assessment of his hypertension, with an abdominal mass being the principal finding.

Biliary tract schwannoma: A rare cause of obstructive jaundice in a young patient

Schwannoma is a tumor derived from Schwann cells which usually arises in the upper extremities, trunk, head and neck, retroperitoneum, mediastinum, pelvis, and peritoneum. However, it can arise in the gastrointestinal tract, including biliary tract. We present a 24-year-old male patient with obstructive jaundice, whose investigation with computed tomography abdomen showed focal wall thickening in the common hepatic duct, difficult to differentiate with hilar adenocarcinoma. He was diagnosed intraoperatively schwannoma of common bile duct and treated with local resection. The patient recovered well without signs of recurrence of the lesion after 12 mo. We also reviewed the common bile duct schwannoma related in the literature and evaluated the difficulty in pre and intraoperative differential diagnosis with adenocarcinoma hilar. Resection is the treatment of choice for such cases and the tumor did not recur in any of the resected cases.

Case report: Benign porta hepatic schwannoma

Schwannoma is a myelin sheath tumor that can occur almost anywhere in the body. The most common locations are the central nervous system, extremities, neck, mediastinum and retroperitoneum. Benign schwannomas in the porta hepatis are extremely rare and radiologically are diagnosed as either enlarged lymph nodes or bowel masses, such as gastrointestinal stromal tumors. In this location they usually produce symptoms by compressing adjacent structures and often present with obstructive jaundice. The preoperative diagnosis can be extremely difficult.

Common bile duct schwannoma: A case report and review of literature

Schwannoma is a myelin sheath tumor complicated with neurofibroma, neurofibromatosis and neurogenic sarcoma. Peripheral nerve sheath tumors represent 2%-6% of gastrointestinal tract stromal tumors (GIST), but there are deficient data about location of neurogenic tumors in the biliary system and only nine cases of schwannoma of the extrahepatic biliary tract have been reported. These tumors are clinically non-specific. They are usually symptomatic by compressing the close or adjacent structures when being retroperitoneal, and their preoperative diagnosis is extremely difficult. This paper reviews the literature data and describes a case of schwannoma of the common bile duct associated with cholestasis in a healthy young woman, diagnosed and treated in our department. This case is of interest on account of the complexity of its diagnosis and the atypical macroscopic growth pattern of the tumor.

[Benign retroperitoneal schwannoma. Incidental diagnostic in patient with hematuria of the percusionist]

The incidence of retroperitoneal primitive tumour varies from the 0.3 to 3%. The sarcomas suppose the group but it frequents of retroperitoneal tumour, being the Schwannoma an unusual tumour with an incidence from 1% to 50% of the retroperitoneal primary tumours. The schwannoma also denominated neurinoma or neurolenoma, it is a derived tumour of the cells of Schwann of the outlying nerves. It is characterized by their clinical and radiological inespecify, being the diagnose pathological, with intense positive inmunohistoquimics to the protein S-100. The election treatment is the surgical remove, with wide margins; not being described cases of malignización neither of metastasis at distance, but if the recurrence existence at probably secondary local level to incomplete resection.

[Retroperitoneal neurilemmona]

Schwannoma is an uncommon tumor arising from neural sheath of peripheral nerves. Histological findings showing Antoni A and B zones are the main diagnostic features. We report a new case of a retroperitoneal located one, which is not its most usual place to appear, in a 60 year old male, presenting left flank pain. He received surgical treatment, having a satisfactory evolution.

[Benign presacral schwannoma producing obstructive uropathy. Clinical case and review of the literature]

We report a case of a presacral benign schwannoma which causes right hydroureteronephrosis without other clinical findings. After a fine-needle aspiration (FNA) biopsy under computed tomography (CT) guidance, a fusocellular tumour without athypia was demonstrated. With the initial diagnosis of benign schwannoma the patient was operated on, removing the tumour, and with the immunohistochemical examination (reactivity for S-100) this diagnosis was confirmed.