CT demonstration of the spontaneous regression of a hypervascular lesion in cirrhotic liver.

In patients with liver cirrhosis, arterial phase enhancement of nodular lesions on helical-CT is currently considered to be highly predictive of malignancy. We report the spontaneous regression of a hypervascular hepatic nodule in a patient with liver cirrhosis within 7 months demonstrated by helical-CT follow-up. This suggests that tumour angiogenesis known to be an obligatory step for acquisition of malignant properties could regress, and can be demonstrated by helical CT.

Mediastinal lymphoma: quantitative changes in gadolinium enhancement at MR imaging after treatment.

Purpose: To compare changes in gadolinium enhancement at magnetic resonance (MR) imaging with outcome in mediastinal lymphoma after treatment.

Materials And Methods: Thirty-one patients with bulky mediastinal lymphoma (17 with Hodgkin disease, 14 with non-Hodgkin lymphoma) underwent serial MR imaging before and up to 50 months after treatment, with routine follow-up (including computed tomography). Signal intensity ratios between masses and muscle were calculated on T1-weighted, T2-weighted, and contrast material-enhanced T1-weighted spin-echo MR images.

Acute swelling of the limbs: magnetic resonance pictorial review of fascial and muscle signal changes.

Objective: This pictorial review analyzes the magnetic resonance (MR) fascial/muscular changes in 69 patients referred as emergencies with acute swelling of the limbs (ASL) from various causes.

Methods And Material: A prospective MR imaging (MRI) study of 69 patients referred as emergencies for ASL was performed. Our population consisted of 45 patients with skin and soft-tissue infections (cellulitis and necrotizing fasciitis, and pyomyositis), six patients with soft-tissue inflammatory diseases (dermatomyositis, graft-versus-host disease), 11 patients with acute deep venous thrombosis, three patients with rhabdomyolysis, one patient with acute denervation and three other patients with rare diseases.

[Role of magnetic resonance imaging in liver pathology].

The increasingly common use of ultrasound examination of the liver has led to increased detection of hepatic tumours, showing a hitherto unsuspected prevalence. Improved techniques in MRI, such as dynamic sequences and new contrast media, are ameliorating the detection and characterization of the lesions, in particular with regard to computed tomography. In addition, since MRI is more sensitive to different components than in computed tomography, it permits better study of diffuse diseases such as haemochromatosis or fatty infiltration, particularly in pseudotumoural forms.

Prevention of thrombotic complications of the nephrotic syndrome by the low-molecular-weight heparin enoxaparin.

The nephrotic syndrome (NS) carries one of the highest risks of thrombotic complications. Consequently, over the last 15 years, some nephrologists have treated patients risk (i.e.

MR imaging in acute infectious cellulitis.

Purpose: To describe magnetic resonance (MR) imaging findings in acute infectious cellulitis and assess its value for the diagnosis of severe necrotizing forms.

Materials And Methods: Spin-echo (SE) T1- and T2-weighted imaging was performed in 36 patients with acute infectious cellulitis. T1-weighted SE images obtained after injection of a paramagnetic contrast agent were also obtained when an abscess was suspected on precontrast images.

Sclerosed liver hemangioma mimicking malignant tumor at MR imaging: pathologic correlation.

This case report illustrates atypical magnetic resonance (MR) imaging findings in a liver hemangioma mimicking a malignant lesion--lower signal intensity than cerebrospinal fluid on T2-weighted spin-echo images and lack of early enhancement on dynamic contrast material--enhanced gradient-echo images. Pathologic analysis demonstrated nearly total replacement of the vascular cavities by dense fibrous tissue. In this rare, sclerosed form, this lesion could not be defined as a hemangioma with MR imaging.

[Massive rectal hemorrhage related to an isolated diverticulum of the right colon in an young patient].

We report a case of a 32-year-old man admitted for massive rectal bleeding related to a solitary diverticulum of the right colon. A superior mesenteric angiogram performed in emergency indicated the site of bleeding, but the correct diagnosis was only established at the histologic examination of the right colon that was surgically resected.

Detection of multiple myeloma involving the spine: efficacy of fat-suppression and contrast-enhanced MR imaging.

Objective: To determine the efficacy of fat-suppressed sequences and contrast-enhanced MR imaging for the detection of focal spinal lesions caused by multiple myeloma, we obtained MR images in 32 patients with newly diagnosed myeloma who had back pain.

Subjects And Methods: All patients had biopsy-proved myeloma and had MR imaging at the painful level of the spine. Spin-echo T1-weighted, T2-weighted, and short TI inversion-recovery (STIR) images; dynamic ultrafast low-angle shot (turbo-FLASH) images after IV injection of a bolus of paramagnetic contrast material; and contrast-enhanced T1-weighted images were obtained.