Magnetic resonance pancreatography (MRP) is a technique that permits accurate evaluation of the pancreatic duct without instrumentation, contrast material administration, or ionizing radiation. Because MRP is entirely noninvasive, MRP avoids complications associated with endoscopic retrograde pancreatography (ERP) such as pancreatitis and perforation. MRP allows for the noninvasive evaluation of patients with acute and chronic pancreatitis, variant anatomy of the pancreatic duct, pancreatic duct trauma, and pancreatic neoplasia. MRP yields diagnostic information in the setting of a failed or incomplete ERP. When MRP is performed in conjunction with conventional abdominal MR, the result is a comprehensive examination of the pancreatic duct as well as the pancreas and other solid organs of the abdomen.
Despite a declining prevalence secondary to improved prophylaxis, Pneumocystis carinii remains an important pulmonary pathogen in the immunocompromised host. Because the radiologist is often the first to suggest the diagnosis of PCP, an awareness of the entire spectrum of imaging features associated with this organism is important. The classic presentation of PCP is a bilateral interstitial pattern, which may be characterized as finely granular, reticular, or ground-glass opacities. When chest radiographic findings are normal or equivocal, high-resolution CT may be helpful, because it is more sensitive than chest radiographs for detecting PCP. The classic CT finding is extensive ground glass attenuation. Increasingly recognized characteristic patterns of PCP in AIDS patients include cystic lung disease, spontaneous pneumothorax, and an upper lobe distribution of parenchymal opacities. Although the radiographic findings in PCP are similar for AIDS and non-AIDS immunosuppressed patients, cystic lung disease has not been described in the latter patient population.
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