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At least 19 recordsLinked to original sources
PubMed2004

CT characteristics of primary retroperitoneal neoplasms.

Primary retroperitoneal neoplasms account for only 0.1-0.2% of all malignancies. Retroperitoneal neoplasms are most commonly mesodermal, neurogenic or lymphatic in origin, with lymphoma, liposarcoma, leiomyosarcoma and malignant fibrous histiocytoma the vast majority of malignant primary retroperitoneal tumors. Although the radiographic features of retroperitoneal neoplasms often overlap, certain CT characteristics, pattern of spread and specific tumor prevalence among different demographic groups can help suggest the tumor type. CT is used to diagnosis and assess the size and extent of retroperitoneal tumors, as well as assess the involvement of organs and vasculature with resection in mind.

Humans↗
PubMed2000

Clinical utility of endoscopic ultrasound and endscopic ultrasound-guided fine needle aspiration in retroperitoneal neoplasms.

OBJECTIVE: Nonpancreatic, retroperitoneal tumors are a relatively uncommon clinical problem. With the advent of endoscopic ultrasound and endoscopic ultrasound-guided fine needle aspiration, gastroenterologists may be called upon to assist in the diagnosis and management of these lesions. This paper reviews the spectrum of upper retroperitoneal lesions encountered at a single institution using endoscopic ultrasound. METHODS: We reviewed all cases of nonpancreaticobiliary or nonadrenal retroperitoneal lesions prospectively gathered from our endoscopic ultrasound database from April 1995 to September 1999. RESULTS: Of 1120 upper endoscopic ultrasound examinations, 18 (1.6%) involved a retroperitoneal lesion; 16/18 lesions were neoplasms, nine were primary retroperitoneal tumors (four lymphomas, two leiomyosarcomas, two extraadrenal paraganglionomas, one leiomyoma), and seven were metastatic cancers. There was one fibrous mass and one mass-like abscess. Endoscopic ultrasound-guided fine needle aspiration was used in 15/18 cases. The management of 16 patients was significantly affected by the results of endoscopic ultrasound and biopsy. CONCLUSIONS: Although it is not a frequent indication, assessing upper retroperitoneal tumors with endoscopic ultrasound and endoscopic ultrasound-guided fine needle aspiration can significantly affect the subsequent management of patients with these lesions.

Adult↗
PubMed1993

[X-ray computed tomography in the diagnosis of peritoneal and retroperitoneal neoplasms].

CT findings of peritoneal and retroperitoneal neoplasms were evaluated in 24 patients. The accuracy of CT in locating peritoneal and retroperitoneal tumors was 87% and in differentiating benign from malignant ones 96%. It is difficult to evaluate the tumors histopathologically. We suggest that CT scan be preferable in diagnosis of tumors in that area.

Adolescent↗
PubMedDate not supplied

Primary retroperitoneal neoplasms: CT and MR imaging findings with anatomic and pathologic diagnostic clues.

Primary retroperitoneal neoplasms are a rare but diverse group of benign and malignant tumors that arise within the retroperitoneal space but outside the major organs in this space. Although computed tomography and magnetic resonance imaging can demonstrate important characteristics of these tumors, diagnosis is often challenging for radiologists. Diagnostic challenges include precise localization of the lesion, determination of the extent of invasion, and characterization of the specific pathologic type. The first step is to determine whether the tumor is located within the retroperitoneal space. Displacement of normal anatomic structures of the retroperitoneum is helpful in this regard. For tumors that are located within the retroperitoneum, the next step is to identify the organ of origin. Specific signs, including the "beak sign," the "embedded organ sign," and the "phantom (invisible) organ sign," are useful for this purpose. When there is no definite sign that suggests the organ of origin, the diagnosis of a primary retroperitoneal tumor becomes likely. Awareness of specific patterns of spread, specific tumor components, and tumor vascularity help in further narrowing the differential diagnosis. Attention to these diagnostic clues is essential in making an accurate radiologic diagnosis of primary retroperitoneal tumors and in obtaining clinically significant information.

Diagnosis, Differential↗
PubMed1992

[Computed tomography of retroperitoneal neoplasms].

CT findings of retroperitoneal neoplasma in 50 cases (51 tumors) were reviewed. There were 28 (55%) malignant tumors and 23 (45%) benign ones. MFH and liposarcoma were the most common malignant tumors and neural origin tumors were the most common benign ones. Differentiation is difficult on the basis of CT features alone. Benign tumors were usually smooth and well defined, and malignant ones ill-defined, irregular in shape, heterogenous in density with massive necrosis. The characteristic CT appearance of liposarcoma is the CT attenuation value by fat density. Neural origin tumors are usually located near the spine. They may have thick wall cystic appearance or are dumbbell shaped, showing expansion or extrinsic pressure to the adjacent bone structures. MFH, hemangiopericytoma and other malignant tumors may have marked enhancement after contrast administration. Non-resectability is shown as: 1. big vessels encased by tumor over 90 degrees, 2. adjacent organs or structures invaded by tumor, 3. multiple masses, and 4. huge tumor invading into the pelvis. Local recurrence is common after surgery. Follow-up CT scans every 6 months in a 2 year period is suggested for early detection of recurrence.

Adult↗
PubMed1976

[Sonographic and roentgenologic course controls following radiotherapy of retroperitoneal neoplasms].

Twelve patients with retroperitoneal tumors were examined sonographically and roentgenologically before and after radiation therapy. The sonograms were evaluated quantitatively by planimetry. Nine cases revealed analogous results in roentgenologic and in sonographic examinations. In three cases sonography revealed a tumor regression which was not verifiable with X-rays. In consideration of these results, sonography is used by us as a primary method for examination of retroperitoneal tumors during the follow-up control.

Humans↗
PubMed1998

[Major blood vessel excision and reconstruction in the treatment of retroperitoneal neoplasms].

OBJECTIVE: To summarize the experience in the treatment of retroperitoneal tumors involving major blood vessels. METHODS: Twenty five cases with retroperitoneal tumors involving major blood vessels were treated by excision of the tumor and the major blood vessel involved followed by vascular reconstruction. RESULTS: After a careful preoperative evaluation and necessary preparation, the tumor together with the involved blood vessels in all patients are successfully resected and the severed major blood vessels reconstructed. There was no operative death. CONCLUSION: Retroperitoneal neoplasm involving major blood vessels is not a contraindication for surgical resection. The tumor and the involved vessel can be removed en bloc followed by vascular reconstruction. The risk of local tumor recurrence can thus be minimized and better survival achieved.

Adolescent↗
PubMed2000

[Resection of pelvic retroperitoneal neoplasm and reconstruction of iliac blood vessels: report of 22 cases].

OBJECTIVE: To study the surgical manipulation of iliac blood vessels invaded by pelvic tumors in order to raise the resection rate. METHODS: We reviewed 22 cases of resection for pelvic retroperitoneal tumors along with the reconstruction of iliac blood vessels in our hospital from July 1994 to January 2000. In 22 cases, 8 received operation on the right iliac arteries and veins, and 14 on the left. RESULTS: Follow-up for 4 months to 5 years and 10 months (average 3.6 years) showed that 3 patients had recurrence and needed secondary operation. All the grafts were patent except one vein graft occlusion 7 months after operation. CONCLUSION: Resection of pelvic retroperitoneal neoplasm combined with reconstruction of iliac blood vessels is safe, effective and practical to raise the excision rate and decrease the recurrence rate.

Adult↗
PubMedDate not supplied

Thrombosed interrupted inferior vena cava and retroaortic left renal vein mimicking retroperitoneal neoplasm.

Anomalies of the inferior vena cava (IVC) have been recognized as one of the predisposing factors for deep vein thrombosis. Rarely, thrombosis of an anomalous retroperitoneal vein may resemble a soft tissue mass. Awareness of this fact helps preventing unnecessary interventions. We report a case of thrombosis of retroaortic left renal vein and interrupted IVC that mimicked a retroperitoneal neoplasm.

Abdominal Pain↗
PubMed1983

[Primary and recurrent retroperitoneal neoplasms of non-organic origin].

Having analyzed results of the treatment of 216 patients the authors came to a conclusion that recurrencies of tumors, repeat ones included, can not be considered as contraindications for operations. The most favourable results were obtained in the operative treatment of recurrent lymphosarcomas.

Adolescent↗
PubMed1989

[Nonorganic retroperitoneal neoplasms of the pelvis].

The results of observations over 116 patients with nonorganic retroperitoneal tumors of the pelvis in the diagnosis of which computerized and ultrasonic tomography were used among other methods showed these methods to expand the possibilities of early diagnosis significantly. Analysis of 83 operations conducted on patients with nonorganic tumors of the pelvis revealed the main reasons why a radical operative intervention failed to be performed. Hemorrhage and pyo-inflammatory processes in the pelvic fat were the most common and serious complications in the postoperative period.

Adolescent↗