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Biomedical subjects

A Drop

Publications and source records attributed to A Drop.

At least 19 recordsLinked to original sources
PubMed2006

Differentiation between cholesteatoma and inflammatory process of the middle ear, based on contrast-enhanced computed tomography imaging.

OBJECTIVE: To assess the usefulness of delayed post-contrast computed tomography (CT) examination for the detection of residual or recurrent cholesteatoma after canal wall up tympanoplasty. STUDY DESIGN AND SETTING: This prospective, non-randomized study, set within an academic medical centre, included 17 consecutive patients who had undergone canal wall up tympanoplasty for cholesteatoma, with possible recurrence. Pre-contrast CT scans and delayed post-contrast images were compared with second look surgical findings. RESULTS: A residual or recurrent cholesteatoma was found in eight of the 17 patients at revision surgery and was correctly diagnosed on post-contrast CT images in six patients (75 per cent). In the two misdiagnosed cases, cholesteatoma pearls smaller than 2.5 mm were not seen on post-contrast CT. The sensitivity of the imaging test was 75 per cent, the specificity was 60.1 per cent, the positive predictive value was 88.1 per cent and the negative predictive value was 81.8 per cent. CONCLUSION: Computed tomography with delayed post-contrast images is a sensitive imaging modality for the detection of residual cholesteatoma. If proven reliable, this method of non-invasive imaging could spare the patient unnecessary revision surgery.

Adult↗
PubMed2006

Changes in cerebral hemodynamics after carotid stenting: evaluation with CT perfusion studies.

PURPOSE: To determine changes in cerebral perfusion parameters, based on CT perfusion imaging, in patients after unilateral transluminal angioplasty and stent placement. MATERIAL AND METHODS: 74 patients with symptomatic high - grade internal carotid artery stenosis (>70%) were studied with CT perfusion imaging before and - on average - 70 hours and 172 days after carotid stent placement. There were 50 patients with unilateral carotid artery stenosis and 24 with stenosis and accompanying contralateral internal carotid artery occlusion. CT examination was performed using a multidetector helical CT scanner (Light Speed Ultra Advantage, GE Healthcare, USA). Maps showing the absolute values of cerebral blood flow (CBF), cerebral blood volume (CBV) and mean transit time (MTT) were generated. RESULTS: In a group with unilateral carotid artery stenosis perfusion deficits were present in 84% of patients, ipsilaterally to stenosis. MTT elongation was noted (6.2-6.8s) together with decreased values of CBF (40-46ml/100g/min) and slightly increased CBV (3.2ml/100g). In this group, 3 days after stenting, 30% of patients had perfusion deficits, and after 6 months only 6%. In a group with carotid artery stenosis and contralateral artery occlusion severe perfusion deficits were noted in both hemispheres and they were present in 100% of patients. 6 months after stenting hypoperfusion was observed only in 17% of patients. CONCLUSIONS: Brain perfusion deficits, observed in a majority of patients with carotid artery stenosis tend to improve considerably after carotid artery stenting, in long - term follow up.

Aged↗
PubMed2005

An unusual crossed course of separately originating left circumflex and left anterior descending arteries with concomitant anomalies found in multi-slice computed tomography.

Coronary artery anomalies occur in approximately in 1-2% of the population. The split origin of branches of the left coronary artery is a relatively common anomaly, usually with no significant observable impairment of cardiac function. The application of multi-slice computed tomography (MSCT) for cardiac imaging is increasing and becoming, along with other techniques, a recognised method of examination of the coronary arteries. In the case presented we observed in an ECG-gated MSCT the anomalous origin and proximal course of the arteries of the left sinus of Valsalva. The ostiae of both coronary arteries were located unusually: the ostium of the LAD was found posterior to the ostium of the LCx. Because of this, the proximal part of the LAD crossed the proximal part of the LCx superiorly. Furthermore, muscular bridges were found in the middle part and in the first diameter branch of the LAD. To our knowledge, this is the first case of a crossed course of the LCx and the LAD to be presented in the literature. Applications of MSCT in coronary imaging are presented in comparison with other diagnostic imaging methods. The advantages and limitations of MSCT as a diagnostic tool for anomalies of the coronary arteries are discussed.

Coronary Vessel Anomalies↗
PubMed2001

Types and patterns of contrast enhancement of hepatic tumours (hepatoma, hemangioma and metastasis) with dynamic computed tomography.

Dynamic sequential computed tomography (d-CT) of the liver was performed in 69 patients with histopathologic findings of hepatoma (HCC), 62 patients with hemangioma and in 78 patients with proved 134 liver metastases. Dynamic enhancement in hepatoma, hemangioma and metastases was analysed during the nonequilibrium phase (30-150s) and delayed equilibrium phase (2,5-7 min) using the following classification of tumour: totally hyperdense, centrally hyperdense, mixed density, totally isodense and totally hypodense. In the early examination phase 14 (19%) HCC were totally hyperdense or peripherally hyperdense, and 40 (57%) HCC were totally hypodense. In the early phase 49 (79%) hemangiomas were peripherally hyperdense. In the early nonequilibrium examination phase 62% metastases were hypodense. In the delayed phase 94% HCC were totally hypodense. Hemangiomas in the delayed phase were totally hyperdense and totally isodense (17/29). In the equilibrium examination phase 97% metastases were hypodense. The contrast enhancement pattern of hepatomas, hemangiomas and metastases seen in dynamic CT scanning is useful in diagnosis of these tumours.

Adult↗
PubMed1999

[Importance of dynamic computed tomography in detecting and evaluating liver cavernous hemangioma].

Dynamic sequential computed tomography (d-CT) was performed in 83 liver hemangiomas in 71 patients. In study group single lesions were present in 62 patients, 9 patients had two or more. In early phase (30-150 s) (79%) hemangiomas were peripherally hyperdense. In the delayed phase (2-7 min) 27% were totally hyperdense, 48% were isodense and 18% were of mixed density. We conclude that the contrast enhancement pattern of hemangiomas seen in dynamic computed tomography is useful in detecting and in differential diagnosis of these tumors.

Hemangioma, Cavernous↗
PubMed1997

[One hundred years of teaching stomatology in Poland].

The development of teaching stomatology in Poland during the loss of independence, between the two World Wars and after the Second World War has been presented in this study. Stomatology was a specialization practised by physicians who were educated in diseases of teeth and oral cavity. Nowadays stomatology is the department of the Faculty of Medicine at all Medical Universities. Dentists are licensed to practise dentistry and to get specialization grades and university degrees.

Education, Dental↗
PubMed1997

[Ultrasound contrast agents].

The article discusses the achievements in ultrasound diagnostics with of contrast agent. Agents which change echogenicity of blood and organ-specific agents as well as three generations of contrast medium were shown. The significance of applied contrast medium in differential diagnostics of hepatic focal lesion was indicated.

Contrast Media↗
PubMed1997

[Pulmonary embolism as a complication of nephrotic syndrome--case report and therapeutic management].

A case of a 41-year-old man, who was treated due to severe steroid and immunoresistant nephrotic syndrome is described. During the pulsed steroid therapy the patient underwent a pulmonary embolism and developed the post-infarction cavern and abscess of the lung. In this study the case history, complications, diagnostic procedures and therapeutic management were described. The probable mechanism of the described complications was carefully discussed.

Adult↗
PubMed1995

[Diagnosis of temporal bone paraganglioma].

On the basis of 7 cases of temporal bone paraganglioma diagnosis of this tumor is presented. Apart from aural symptoms cranial nerves palsy may appear. Computer tomography, magnetic resonance imaging and subtraction angiography are essential investigations.

Adolescent↗
PubMed1991

[Diagnosis of dental caries based on intra-oral roentgenograms].

On 238 intra-oral roentgenograms there were assessed carious process, shape, size, extent and depth of defects as well as the possibility of complications in teeth which were not treated. There were assessed 277 defects, out of which 194 in upper teeth and 83 in lower ones. In all the teeth of the maxilla and of the mandible there was found the greatest number of amorphic defects and semilunar contact surfaces. There were also observed a lot of defects in radiciform cementum, thus, often under the gingivae. These are sites difficult for access for clinical examination. That is why radiologic examination is often conclusive in localizing carious process and in accurate diagnosing in the case of pulpitis going on.

Dental Caries↗