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Biomedical subjects

D P Mayer

Publications and source records attributed to D P Mayer.

At least 19 recordsLinked to original sources
PubMed1994

Computed tomographic demonstration of the vacuum phenomenon in the subtalar and tibiotalar joints.

Gas has been identified within diarthrodial joints for more than eight decades. From a radiologic standpoint, the so-called "vacuum phenomenon" is the most common demonstration of gas. We retrospectively reviewed computed tomographic scans of 495 feet and ankles performed over a 24-month period. We found 12 patients (2.4%) with clearly demonstrable gas within the tibiotalar or subtalar joints. This gas was not associated with the presence of fixation hardware or infection. Each patient with gas in the subtalar joint had plain radiographic changes consistent with subtalar arthritis. We conclude that gas in the subtalar joint can be effectively demonstrated by high-resolution CT techniques in the subtalar and tibiotalar joints in patients with advanced degenerative disease.

Adult↗
PubMed1993

Aneurysmal bone cyst.

Key findings that aid in the diagnosis of an aneurysmal bone cyst are: 1) typically the patients are young individuals less than 20 years old; 2) an expansile bone lesion is bordered by a thin, low signal intensity rim mass; 3) the lesion is inhomogenously increased in signal on T2-weighted images; and 4) multiple fluid-fluid levels are seen with the mass on T2-weighted magnetic resonance imaging scans.

Adult↗
PubMed1988

Giant cholesterol cysts of the petrous apex.

The giant cholesterol cyst is a clinical entity distinct from cholesterol granulomas and other destructive lesions of the petrous bone. Preoperative assessment by computed tomographic scan and magnetic resonance imaging is extremely helpful. Attempts at total resection of the lesion are not necessary. Adequate surgical drainage may be established through the mastoid or middle fossa.

Adolescent↗
PubMed1986

Intraoperative ultrasonic localization of a small pancreatic pseudocyst.

Intraoperative pancreatic ultrasound can be useful to identify small masses or cysts that are not readily palpable at surgery. In our case, a small (2.0 cm diameter) pseudocyst was demonstrated preoperatively by ultrasound and computed tomography, but could not be palpated at surgery. Intraoperative ultrasound located and helped to guide needle aspiration of the pancreatic pseudocyst. Other indications for intraoperative pancreatic ultrasound are reviewed.

Adult↗
PubMed1986

Contrast medium precipitation during abdominal CT.

Abdominal computed tomography (CT) scans of 55 patients who had ingested Gastrografin (meglumine diatrizoate and diatrizoate sodium) diluted to 2% with tap water and flavored with a commercial fruit juice base were reviewed. Twenty patients (36%) demonstrated intraluminal precipitation of Gastrografin shown by focal areas of markedly increased attenuation within the gastric lumen or trapped within gastric folds. Beam-hardening artifact produced by precipitation was observed, which limited the diagnostic value of some examinations. In vitro CT scans of the same Gastrografin solution titrated with hydrochloric acid or sodium hydroxide showed that by raising the pH of the solution, precipitation was virtually eliminated. Fifty-one CT scans of the abdomen using a buffered Gastrografin solution demonstrated precipitation in only five patients. Properly buffered dilute oral Gastrografin solutions should significantly decrease the prevalence of precipitation during abdominal CT examinations.

Beverages↗
PubMed1985

Ectopic embryo detection using real-time sonography.

An analysis of the sonograms of 60 patients with a surgically confirmed diagnosis of ectopic pregnancy was performed. In 36 examinations, both real-time and static images were compared, and real-time was judged superior in 22 based on a correlation between the original report and surgical pathology. The appearance of the endometrial canal and the adnexa was characterized in a total of 65 scans. The endometrial canal appearance was variable, with the most common finding being a linear echo (39%). The adnexal changes were less diverse, with an adnexal ring suggestive of an extrauterine gestational sac identified in 60%. In 10 cases, the adnexal ring contained a distinct fetus with a measurable crown-rump length, and cardiac activity was evident in six. Our results indicate that real-time ultrasound coupled with serum beta-hCG RIA should be the procedure of choice when ectopic pregnancy is suspected.

Adnexa Uteri↗