The role of diffusion-weighted MRI and contrast-enhanced MRI for differentiation between solid renal masses and renal cell carcinoma subtypes.

Purpose: To assess the value of diffusion-weighted magnetic resonance imaging (DW-MRI) and contrast-enhanced MRI (CE-MRI) for differentiation between benign and malignant solid renal masses, renal cell carcinoma (RCC) subtypes, oncocytomas, and lipid-poor angiomyolipomas (LP-AML).

Methods: Minimum or lowest 'apparent diffusion coefficient' (ADC) and representative ADC values (ADC) of 112 renal masses (n: 46 benign renal mass, n: 66 malignant renal mass) were measured on DW-MRI images (b 50, 400, 800 s/mm). Signal intensity (SI) measurements were performed in normal renal parenchyma and most avid enhanced area of the renal masses at precontrast, corticomedullary, and nephrographic phases on CE-MRI.

Diffusion MRI features of acute encephalopathy due to stopping steroid medication abruptly in congenital adrenal hyperplasia.

Congenital adrenal hyperplasia (CAH) is characterized by adrenal steroid biosynthesis defect. Steroid replacement therapy should be performed regularly in these patients. Adrenal crisis may be present in acute stress due to increased cortisol requirements or in steroid deficiency due to stopping steroid medication abruptly.

Appendiceal mucocele: clinical and imaging features of 14 cases.

Purpose: Appendiceal mucocele as a cystic dilatation filled with mucinous material is a very rare disease of the appendix vermiformis. Its preoperative diagnosis is still acking behind common use of imaging techniques.

Methods: Retrospective analysis of the patients with a pathological diagnosis of appendiceal mucocele with regard to clinical and imaging features.

An unusual liver mass: primary malignant mesothelioma of the liver : CT and MRI findings and literature review.

Primary malignant mesothelioma of the liver is extremely rare, and radiologic features have been defined in only one case. We present radiologic findings of two cases which are pathologically proven as primary malignant mesothelioma of the liver. Malignant mesothelioma of the liver may be included in a differential diagnosis list if there is a heterogeneous, hemorrhagic and necrotic lesion in the liver, with peripheral serpiginous vascular structures and increasing septal enhancement in post-contrast images.

The effectiveness of power Doppler vocal fremitus imaging in the diagnosis of breast hamartoma.

Objectives: To evaluate the usefulness of power Doppler vocal fremitus (PDVF) breast sonography for differentiation of hamartomas from other breast (malign or benign) masses.

Material And Methods: Two hundred and six breast masses in 180 women were evaluated. The breast lesions were scanned first by mammography (MG), then by ultrasonography (US) with PDVF imaging.