Differentiation of renal oncocytoma and renal clear cell carcinoma using relative CT enhancement ratio.

Background: The difference between renal oncocytomas (RO) and renal clear cell carcinomas (RCCs) presents the greatest diagnostic challenge. The aim of this study was to retrospectively determine if RO and RCCs could be differentiated on computed tomography (CT) images on the basis of their enhancement patterns with a new enhancement correcting method.

Methods: Forty-six patients with a solitary renal mass who underwent total or partial nephrectomy were included in this study.

The application of MR imaging in the detection of hip involvement in patients with ankylosing spondylitis.

Objective: To investigate the changes in hip MR imaging, evaluate the frequency of hip involvement and compare the value of clinical symptoms, radiographs, and MR imaging in the detection of hip involvement in patients with ankylosing spondylitis (AS).

Methods: Anteroposterior radiographs of the pelvis, MR imaging of the hip and clinical evaluation were undertaken in 58 patients with definite AS. All patients were followed up 3 years.

[Diagnostic value of computed tomography in invasive pulmonary fungal infections].

Objective: To analyze the computed tomographic (CT) features of invasive pulmonary fungal infections (IPFI) and evaluate the value of CT-guided percutaneous biopsy.

Methods: Seventeen IPFI cases diagnosed by CT-guided percutaneous biopsy were recruited. The distribution, extent, density and size of IPFI were analyzed in correlation with the final diagnosis retrospectively.

[Avascular necrosis of the femoral head:correlation of imaging and pathological findings].

Objective: To investigate the relationship between imaging and pathological findings of avascular necrotic of the femoral head (ANFH).

Methods: A comparison among of conventional radiography, computerized tomography (CT), magnetic resonance imaging (MRI), gross section and pathological examinations was performed in 20 femoral heads in 15 patients undergoing total hip replacement for established ANFH.

Results: ANFH involved the anterosuperior aspect of femoral head in all hips.

[Study of comparing the multiple MR sequenc in the articular cartilage of knee joint].

Objective: To investigate the value of various MR imaging sequences for the assessment of articular cartilage and to determine the most optional sequence.

Methods: MR sagittal scanning of knee joints were performed in nine fresh bovine models. MR scan sequences consisted of TSE-T(1)WI, TSE-T(2)WI, TSE-PDWI, 3D-FFE-T(1)WI, 3D-BFFE, TSE-T(1)WI-SPIR, TSE-T(2)WI-SPIR, TSE-PDWI-SPIR, 3D-FFE-SPIR, 3D-FFE-WATS, 3D-FFE-MTC, 3D-BFFE-WATS.

[Application of computed tomography guided percutaneous fine-needle aspiration biopsy in examination of pancreas and Vater's ampulla].

Objective: To evaluate the effects of computed tomography (CT) guided percutaneous fine-needle aspiration biopsy (FANB) in examination of pancreas and Vater's ampulla.

Methods: One hundred and six patients, 71 males and 35 females, aged 21 approximately 74, with lesions located in the pancreas and Vater's ampulla, 1.5 approximately 5 cm in size (< 3 cm in 32 cases and >or= 3 cm in 74 cases), underwent CT guided percutaneous FANB with 22-gauge needle (in 84 cases) or 20-gauge needle (in 22 cases) by anterior approach.

[Vascularized iliac bone grafting for avascular necrosis of the femoral head].

Objective: To evaluate the indications for vascularized iliac bone grafting in the treatment of osteonecrosis of the femoral head and operative results.

Methods: From October 1993 to August 2000, Twenty-six hips of 18 patients with osteonecrosis of the femoral head underwent vascularized iliac bone grafting. Clinical evaluation was made according to Harris Hip Score and ARCO staging system.