1/7. Partially calcified renal cell carcinoma mimicking renal calculus.Radiologic evaluation disclosed a renal tumor and a calcified mass in the right kidney of a 45-year-old man. The resected kidney revealed that a renal cell carcinoma had invaded the renal pelvis and the polypoid intrapelvic portion had undergone calcification resulting in a pseudocalculus.- - - - - - - - - - ranking = 1keywords = calculus (Clic here for more details about this article) |
2/7. Recurrent pancreatitis caused by a calcified ascaris in the duct of Wirsung.A case report of recurrent pancreatitis in a 20-yr-old woman due to an impacted calcified ascaris remnant within the duct of Wirsung is presented. Endoscopic retrograde cholangiography identified a filling defect in the proximal main pancreatic duct. Transampullary endoscopic retrieval failed to extract the calculus and operative intervention was required to remove the calcified worm remnant.- - - - - - - - - - ranking = 0.2keywords = calculus (Clic here for more details about this article) |
3/7. Abdominal calcifications in infants and children.Abdominal and pelvic calcifications are usually incidental findings and require further measures to determine their origin. Most laboratory investigations are of little help. Plain anteroposterior and lateral x-rays are essential. The time of appearance and localisation of a calcification is of diagnostic importance. Amorphous, granular and irregular calcification can be an early sign of malignancy. Mobility of a calcification also helps to clarify its origin. Over the past 15 years abdominal and pelvic calcifications, excluding urological radiodensities, have been found in 63 patients up to fourteen years of age at our institute. A migrating deposit in the omentum, a spontaneously amputated calcified ovary mimicking a vesical calculus and a congenital retroperitoneal xanthofibroma caused the greatest difficulty in establishing a preoperative diagnosis.- - - - - - - - - - ranking = 0.2keywords = calculus (Clic here for more details about this article) |
4/7. Submucosal renal pelvic calcification simulating a pelvic stone.We report a case of renal pelvic calcification radiologically simulating a renal pelvic calculus. Radiological and histopathological examination of the resected kidney revealed only submucosal calcification in the renal pelvis. This is the first report in the English literature of a renal pelvic calcification unrelated to amyloidosis.- - - - - - - - - - ranking = 0.2keywords = calculus (Clic here for more details about this article) |
5/7. Identification of a brain stone as calcified hemangioma: case report.A 71-year-old woman with progressive hemiparesis had a large cerebral calculus (brain stone) removed from the temporal lobe. Her condition thereafter improved remarkably. The differential diagnosis and specific methods to determine the angiomatous nature of this almost acellular mass are discussed. reticulin impregnation, elastic tissue stain, and electron microscopy were of greatest value.- - - - - - - - - - ranking = 0.2keywords = calculus (Clic here for more details about this article) |
6/7. Acute obstructive hydrocephalus caused by a migrating intraventricular calculus. Case report.A 10-year-old boy presented with acute obstructive hydrocephalus caused by the impaction of a calculus on the cerebral aqueduct. The calculus migrated from the third ventricle to the fourth ventricle after ventricular drainage and right ventriculoperitoneal shunt placement had been performed. The nature and origin of the calculus could not be determined, although its release from the choroid plexus in the lateral ventricle is highly possible.- - - - - - - - - - ranking = 1.4keywords = calculus (Clic here for more details about this article) |
7/7. Bone metaplasia of urothelial mucosa: an unusual biological phenomenon causing kidney stones.A kidney stone was analyzed by infrared spectrometry, by petrography using ground slices, and by undecalcified histology. Infrared spectrometry showed that the stone was composed of calcium oxalate monohydrate (whewellite), calcium oxalate dihydrate (weddellite), and calcium phosphocarbonate (apatite). Optical microscopy of the ground sections revealed tissue fragments within the stone containing small spaces resembling empty osteocyte lacunae. Histological analysis of methacrylate-embedded sections confirmed the presence of an area of heterotopic ossification. Urothelial mucosa is potentially capable of inducing bone formation and in this case the bony tissue had apparently functioned as a nucleation site for the calculus.- - - - - - - - - - ranking = 0.2keywords = calculus (Clic here for more details about this article) |