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Biomedical subjects

R C Pfister

Publications and source records attributed to R C Pfister.

At least 19 recordsLinked to original sources
PubMed1989

Migratory lobar nephronia.

Lobar nephronia or focal bacterial nephritis is a pre-abscess stage of localized cellulitis and has been shown to represent a focal imaging manifestation of what is frequently a diffuse renal process. To the best of our knowledge, although multi-focal bacterial nephritis has been described, a migratory pattern has not been observed. This report describes a previously healthy 32-year-old woman with pathologically proven lobar nephronia that exhibited a migratory pattern on serial computed tomography (CT) and a prolonged course on antibiotic therapy. Possible etiologies for this unusual course, along with the CT, sonographic and needle biopsy features of this disease are discussed.

Adult↗
PubMed1989

Adrenal cysts: imaging and percutaneous aspiration.

Six patients with primary adrenal cysts were encountered during a period of 3 years. Multiple imaging modalities were used to characterize these lesions, including magnetic resonance imaging in one case. Percutaneous aspiration was performed on four of the six cysts - in one case, in the operating room prior to excision of the cyst. Cholesterol was detected in four cysts and cortisol in one cyst. Cytologic findings from aspiration biopsy were benign in all five cases. Two cysts were removed, one of them after reaccumulation of the fluid after needle aspiration. The findings in this small series of adrenal cysts suggest that in certain cases, complete cyst aspiration, rather than surgical excision, may be carried out initially for diagnosis and management of indeterminate suprarenal cystic lesions and symptomatic cysts of the adrenal gland.

Adrenal Gland Diseases↗
PubMed1989

Percutaneous, large-bore, suprapubic cystostomy: technique and results.

A technique to insert large-bore suprapubic cystostomy catheters (18-French or larger) percutaneously, under radiologic imaging guidance, is described in 15 men who required long-term drainage of the bladder. This single-stage procedure is carried out under local anesthesia with optional IV sedation. It consists of rapid enlargement of the percutaneous track by means of a balloon dilatation catheter followed by insertion of a self-retaining Foley cystostomy catheter through a peel-away sheath. No complications associated with the placement of the catheters occurred, and long-term patient compliance has been satisfactory. Our results suggest that percutaneous, large-bore suprapubic cystostomy may be a preferred alternative to surgical cystostomy.

Adult↗
PubMed1988

Urinary extracorporeal shock wave lithotripsy: equipment, techniques, and overview.

Second generation urinary lithotriptors are characterized by extensive technical alterations and significant equipment improvement in the functional, logistical, and medical aspects of shock wave lithotripsy (SWL). These newer devices feature a water bath-free environment, a reduced anesthesia requirement, improved imaging, functional uses in addition to lithotripsy, or combinations thereof. Shock wave generation by spark gap, electromagnetic, piezoelectric and microexplosive techniques are related to their peak energy, frequency, and total energy capabilities which impacts on both anesthesia needs and the length and number of treatment sessions required to pulverize calculi. A master table summarizes the types of SW energy, coupling, imaging systems, patient transport, functional features, cost, and treatment effectiveness of 12 worldwide lithotriptors in various stages of investigative and clinical trials as monitored by the Food and Drug Administration (FDA) of America.

Equipment Design↗
PubMed1988

Fat-filled postoperative renal cortical defects: sonographic and CT appearance.

Surgical filling of renal cortical wedge resection defects with vascularized retroperitoneal fat resulted in postoperative sonographic and CT appearances that simulated focal renal masses in four patients. Correct identification of this abnormality is important in order to avoid unnecessary further evaluation to exclude renal neoplasm.

Adipose Tissue↗
PubMed1979

Renal-stone dissolution via percutaneous nephrostomy.

Recurrent renal stones associated with urinary infection were treated in eight kidneys in six patients by percutaneous nephrostomy and irrigation with hemiacidrin, a commercially available solution of organic acids and magnesium. The stones, presumably composed of triple phosphates (magnesium, ammonium and calcium phosphate), were completely dissolved in six kidneys; in two they were partially dissolved and subsequently recovered by other methods. No serious complications were encountered. The technic requires special precautions against perinephric and intravascular dissemination of infection, but it offers potentially effective therapy for certain kidney stones without the use of general anesthesia or operation.

Adult↗
PubMed1979

Giant hydronephrosis in children.

Twenty pediatric patients with giant hydronephrosis were reviewed. This was defined as a kidney that occupied a hemiabdomen, met or crossed the midline, and was at least 5 vertebrae in length. The majority (16) were cases with ureteropelvic junction obstruction. In 2 cases, the primary pathology was obstructive megaureter. In 2 cases, the infants had severe urethral valves with massive upper tract dilatation. In 6 patients with a normal contralateral kidney, nephrectomy was performed. In one patient with bilateral pathology, one nonfunctioning kidney was removed later. A reconstructive operation was undertaken in 14 of the 20 patients. There was one late death from septicemia in an infant male with urethral valves and bilateral dysplastic kidneys.

Child↗
PubMed1979

Expanded high iodine dose in computed cranial tomography: a preliminary report.

Fifty patients undergoing cranial CT had expanded-high-iodine-dose (EHID) scans. The EHID was given either as an additional bolus dose (37--40 g iodine) after a routine infusion contrast scan (42.3 g), or as a continuous infusion (total 74--80 g). Diseases presented include primary and metastatic neoplasm, pituitary neoplasm, and demyelinating disease. The results suggest that the primary usefulness of the EHID is in (a) detecting multiple rather than solitary brain lesions, (b) the definitive demonstration of an equivocal area of abnormal enhancement, and (c) differentiating solid histologically microcystic from frankly macrocystic neoplasms.

Adult↗
PubMed1979

The nephrogram.

Explore the source record for details and available documents.

Acute Kidney Injury↗
PubMed1978

Polycystic kidneys without radiologic enlargement.

Polycystic kidneys in adults usually appear in the middle years and are described as large kidneys with most of their parenchyma displaced by a large number of cysts. Often the diagnosis is excluded if the intravenous pyelogram reveals kidneys of normal size. This report describes a patient with normal sized polycystic kidneys discovered at an advanced age.

Aged↗