Angiomyolipoma arising from the liver is a rare primary benign lipomatous tumor of the lever. We experienced a case of surgically proven hepatic angiomyolipoma, which was preoperatively diagnosed by definning of its characteristic histologic components and benign radiologic nature with various imaging modalities including ultrasound, dynamic computed tomography, angiography, and magnetic resonance imaging. It was the first reported case in the world that full radiologic evaluation was taken and internal vascular proliferation was defined by using dynamic bolus CT prior to angiography.
Angiography ; Angiomyolipoma* ; Liver* ; Magnetic Resonance Imaging ; Ultrasonography

Angiomyolipoma arising from the liver is a rare primary benign lipomatous tumor of the lever. We experienced a case of surgically proven hepatic angiomyolipoma, which was preoperatively diagnosed by definning of its characteristic histologic components and benign radiologic nature with various imaging modalities including ultrasound, dynamic computed tomography, angiography, and magnetic resonance imaging. It was the first reported case in the world that full radiologic evaluation was taken and internal vascular proliferation was defined by using dynamic bolus CT prior to angiography.
Angiography ; Angiomyolipoma* ; Liver* ; Magnetic Resonance Imaging ; Ultrasonography

PURPOSE: Recently, incidental small renal tumors detected by computerized tomography(CT) or ultrasonography(US) have been increasing. Differentiation between the small renal cell carcinoma and benign tumorous lesions is often difficult. To reduce the unnecessary surgical interventions for these small renal tumors, we anayzed the radiologic findings of surgically removed small renal tumors(less than 3cm in diameter) and evaluated whether radiologic studies would predict their histologic findings. MATERIALS AND METHODS: Radiologic findings of 28 renal cell carcinomas(RCC), 7 angiomyolipomas(AML), 4 cysts including 2 multilocular cysts and 1 oncocytoma were analyzed, retrospectively. Density, contour, and heterogenity of the tumors on CT were evaluated, while echogenecity, posttumoral enhancement, peritumoral hypoechoic rim, and intratumoral cystic change on US were evaluated. RESULTS: Tiny fat density on CT was found in 4 of 7 AMLs and 1 of 28 RCCs. On US, 3 of 6 AMLs and 1 of 24 RCCs showed marked hyperechogenecity identical to the renal sinus fat. AMLs showed fat density in 4 of 7(57.1%) on CT and marked hyperechogenecity in 5 of 7(71.4%) on US, respectively. Two AMLs which showed hypoechogenecity and no fat density had less than 5% of fat on histologic examination while others had more than 30% of fat. All AMLs, oncocytoma and most RCCs(73%) showed exophytically out-bulging growth pattern while all benign cysts showed endophytic growth. Posttumoral sonic enhancement was found in 3 of 4 cysts and 1 of 24 RCCs. Peritumoral hypoechoic rim and intratumoral cystic changes were identified in 8 of 24(33%) and 7 of 24(29%) RCCs, respectively, while no such findings were detected in other tumors and cysts. CONCLUSIONS: Fat density on CT or marked hyperechogenecity identical to renal sinus fat on US strongly suggest angiomyolipoma, whereas endophytic growth pattern and posttumoral enhancement on US favor benign cyst. In the meantime, absence of above findings combined with peritumoral halo and/or intratumoral cystic change indicate renal cell carcinoma which should be explored.
Adenoma, Oxyphilic ; Angiomyolipoma ; Carcinoma, Renal Cell ; Retrospective Studies* ; Ultrasonography

PURPOSE: Recently, incidental small renal tumors detected by computerized tomography(CT) or ultrasonography(US) have been increasing. Differentiation between the small renal cell carcinoma and benign tumorous lesions is often difficult. To reduce the unnecessary surgical interventions for these small renal tumors, we anayzed the radiologic findings of surgically removed small renal tumors(less than 3cm in diameter) and evaluated whether radiologic studies would predict their histologic findings. MATERIALS AND METHODS: Radiologic findings of 28 renal cell carcinomas(RCC), 7 angiomyolipomas(AML), 4 cysts including 2 multilocular cysts and 1 oncocytoma were analyzed, retrospectively. Density, contour, and heterogenity of the tumors on CT were evaluated, while echogenecity, posttumoral enhancement, peritumoral hypoechoic rim, and intratumoral cystic change on US were evaluated. RESULTS: Tiny fat density on CT was found in 4 of 7 AMLs and 1 of 28 RCCs. On US, 3 of 6 AMLs and 1 of 24 RCCs showed marked hyperechogenecity identical to the renal sinus fat. AMLs showed fat density in 4 of 7(57.1%) on CT and marked hyperechogenecity in 5 of 7(71.4%) on US, respectively. Two AMLs which showed hypoechogenecity and no fat density had less than 5% of fat on histologic examination while others had more than 30% of fat. All AMLs, oncocytoma and most RCCs(73%) showed exophytically out-bulging growth pattern while all benign cysts showed endophytic growth. Posttumoral sonic enhancement was found in 3 of 4 cysts and 1 of 24 RCCs. Peritumoral hypoechoic rim and intratumoral cystic changes were identified in 8 of 24(33%) and 7 of 24(29%) RCCs, respectively, while no such findings were detected in other tumors and cysts. CONCLUSIONS: Fat density on CT or marked hyperechogenecity identical to renal sinus fat on US strongly suggest angiomyolipoma, whereas endophytic growth pattern and posttumoral enhancement on US favor benign cyst. In the meantime, absence of above findings combined with peritumoral halo and/or intratumoral cystic change indicate renal cell carcinoma which should be explored.
Adenoma, Oxyphilic ; Angiomyolipoma ; Carcinoma, Renal Cell ; Retrospective Studies* ; Ultrasonography

Angiomyolipomas commonly originate from renal parenchyma but extremely rarely from perinephric space. We report a case of angiomyolipoma of the perinephric space confirmed by radical nephrectomy. A 13-year-old boy presented with left flank pain and abdominal distension, first experienced five months earlier. Ultrasonography and CT indicated that in the space surrounding the left kidney, a huge fat-containing mass with linear strands was present.
Adolescent ; Angiomyolipoma* ; Flank Pain ; Humans ; Kidney ; Male ; Nephrectomy ; Ultrasonography

Renal angiomyolipomas are uncommon benign neoplasms composed of mature adipose tissue, thick walled blood vessels and smooth muscle in varying proportions. Accurate preoperative diagnosis of renal angiomyolipoma is essential if conservative resection or angiographic embolization is to be used. In recent years, abdominal computerized tomography (CT) and renal ultrasonography have resolved the diagnostic dilemma, making detection of angiomyolipomas possible in almost all cases. Recently, we performed selective renal angioembolizations in 3 patients (2 females, 1 male). After followup period of 6 months to 1 year, all patient got better in clinical symptoms. In two of them the lesions decreased in size on followup CT but one patient showed suspicious malignant change and we performed the exploration to rule out renal malignancy. In our opinion, it is appropriate to perform the selective renal angioembolization for initial treatment of renal angiomyolipomas.
Adipose Tissue ; Angiomyolipoma* ; Blood Vessels ; Diagnosis ; Female ; Follow-Up Studies ; Humans ; Muscle, Smooth ; Ultrasonography

Although the excretory urogram, retrograde pyelogram, renal angiogram and ultrasound studies provide formidable competition in renal imaging, CT has advantages over each of these techniques and can provide unique and vital information in evaluating selected renal diseases. CT provide a cross-sectional view of the anatomy, thus delineating more clearly the renal margins and adjacent organs. CT imaging is not dependent on renal function and more easily recognized as a true anatomic portrayal, Furthermore, to discriminate density differences, the nature of renal masses may be determined. Recently we experienced several cases of renal diseases, confirmed with CT which was particuly useful in making in accurate diagnosis than other urologic examinations. Surgery, clinical follow-up and repeated radiologic examinations confirmed the accuracy of CT and there were no cases in which medical of surgical management was inappropriately guided by CT. herein a series of renal disease-polycystic kidney with bilateral radiolucent pelvic stones, angiomyolipoma, renal infarction, renal injury and renal pelvic transitional cell carcinoma were presented and the diagnostic advantages of CT for evaluation of renal diseases were discussed with a review of the literatures.
Angiomyolipoma ; Carcinoma, Transitional Cell ; Diagnosis ; Follow-Up Studies ; Infarction ; Kidney ; Ultrasonography

Renal angiomylipomas are uncommon benign neoplasms composed of mature fat tissue, thick-walled blood vessels and smooth muscle in varying proportions, which can be commonly diagnosed by those unique fat nature in abdominal ultrasonography and abdominal CT scan. Renal angiomyolipomas without demonstrable fat component are rarely reported which is difficult to differentiate from renal cell carcinoma. We report a case of renal angiomyolipoma without demonstrable fat component which was proven to positive HMB-45 stain after partial nephrectomy.
Angiomyolipoma* ; Blood Vessels ; Carcinoma, Renal Cell ; Muscle, Smooth ; Nephrectomy ; Tomography, X-Ray Computed ; Ultrasonography

Renal angiomyolipoma is a sort of benign tumor of the kidney, which is composed of blood vessel, fat tissue and smooth muscle. Its occurrence is uncommon, and its diagnosis had been difficult, because its radiographic and clinical features are similar with renal cell carcinoma. But recently the ultrasonographic and computed tomographic images of renal angiomyolipoma are sufficiently characteristic to permit accurate radiologic diagnosis. Herein we present a case of angiomyolipoma of the right kidney in 32 year old housewife, which has been preoperatively diagnosed with the computed tomography and ultrasonography, and managed with nephrectomy.
Adult ; Angiomyolipoma* ; Blood Vessels ; Carcinoma, Renal Cell ; Diagnosis ; Humans ; Kidney ; Muscle, Smooth ; Nephrectomy ; Ultrasonography

We have analyzed utrasonographic finding of 55 cases of hydronephrosis and 34 cases of renal maasses. The results are as follows; 1. 55 cases of hydronephrosis revealed renal enlargement in 55 cases, separation of central echo complex in 27 cases, multiple anechoic areas radiating from the center in 25 cases and dilated renalpelvis in 24 cases. 2. Among the renal masses in 34 cases, simple renal cyst were 15 cases, polycystic kidney in 8 cases, hypernephroma in 8 cases, Wilms' tmor in 2 cases and angiomyolipoma in 1 case. 3. Simple renal cystrevealed single in 14 cases (93%) and well defined anechoic mass with posterior enhancement in all cases. 4. Polycystic kidney revealed bilateral irregular shaped renal enlargement and multiple anechoic cysts throughout the kidney. 2 cases (25%) involved liver. 5. 6 cases (75%) of hypernephroma revealed ill defined modarately echogenicmass without posterior enhancement. 6. All cases of Wilms' tumor revealed well defined large mixed echogenic massin right kidney. 7. Angiomyolipoma revealed bilateral dense echogenic mass with large hemorrhagic cyst in rightkidney. 8. The ultrasonography is useful noninvasive diagnostic modality of evaluation of renal masses and hydronephrosis.
Angiomyolipoma ; Carcinoma, Renal Cell ; Hydronephrosis ; Kidney ; Liver ; Polycystic Kidney Diseases ; Ultrasonography ; Wilms Tumor