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Biomedical subjects

T Pirnar

Publications and source records attributed to T Pirnar.

At least 19 recordsLinked to original sources
PubMed2001

Splenic vascular malformations and portal hypertension in hereditary hemorrhagic telangiectasia: sonographic findings.

Hereditary hemorrhagic telangiectasia, or Osler-Rendu-Weber disease, is an autosomal dominant disorder in which a variety of vascular dysplasias occur throughout the organ systems. We report the gray-scale and color Doppler sonographic findings in a case of hereditary hemorrhagic telangiectasia. Gray-scale sonographic examination revealed massive splenomegaly, multiple dilated intrasplenic vascular structures (some with adjacent punctate calcifications), an aneurysmal dilatation of the splenic vein, dilated intrahepatic portal branches, and marked atrophy of the right hepatic lobe. Color Doppler sonography showed dilatation of the truncus coeliacus and high-velocity flow in the splenic artery. There were significant aliasing in the splenic hilum and an abnormal, arterialized flow in intrasplenic branches of the splenic vein. The splenic vein was massively enlarged with increased flow velocity and contained an isolated aneurysmal dilatation in the hilum. There were multiple serpiginous retroperitoneal collateral vessels, and the left gastric vein was dilated with hepatofugal flow. The patient had portal hypertension that developed secondary to the increased portal flow.

Adult↗
PubMed2001

The prediction of papaverine induced priapism by color Doppler sonography.

PURPOSE: We identified color Doppler sonography findings that are useful for predicting priapism in patients after the intracavernous injection of diagnostic papaverine. MATERIALS AND METHODS: We evaluated 72 men with erectile dysfunction by color Doppler sonography after the diagnostic injection of papaverine. Cavernous artery waveforms were recorded, and peak systolic and diastolic velocity of the recorded waveforms was measured. In cases of priapism color Doppler sonography findings were retrospectively evaluated to identify any finding that would predict priapism. RESULTS: Priapism was observed in 8 of the 72 patients (11.1%). In 6 of 8 priapism cases there was no blood flow in the cavernous artery during or after adequate erection, including after minutes 5, 10 and 20 in 3, 1 and 2, respectively. This absence of encoding was not relieved even after all stimuli were removed. In 2 patients who later presented with complaints of priapism the Doppler study was completed normally and all parameters were acquired without any cessation of blood flow in the cavernous artery. The persistent disappearance of color and pulse encoding in the cavernous artery predicted priapism with 75% sensitivity, 100% specificity, a positive and negative predictive value of 100% and 96.9%, respectively, and 97% accuracy. CONCLUSIONS: The persistence of absent blood flow in the cavernous artery even after the elimination of all stimuli during penile color Doppler ultrasound is a reliable predictor of priapism. The finding is accurate enough to initiate treatment for priapism to avoid further delay.

Humans↗
PubMed1997

Magnetic resonance imaging evaluation of incision healing after cesarean sections.

The purpose of this study was to examine the healing period of incision scar in myometrial wall and the normal pelvis after cesarean sections by means of MRI. In this study 17 voluntary women were examined after their first delivery with cesarean section in the early postpartum period (first 5 days), and following this, three more times in 3-month intervals. The MRI examinations were performed on a 1.0-T system (Magnetom, Siemens, Erlangen, Germany), and sagittal T1-weighted (550/17 TR/TE) and T2-weighted (2000/80 TR/TE) spin-echo (SE) images of the pelvis were obtained. During follow-up examinations incision scar tissues lost their signals within the first 3 months on both SE sequences, and little alteration was observed in the subsequent tests. Zonal anatomy of the uterus reappeared completely 6 months after cesarean sections. The time for the involution of the uterus was independent of the zonal anatomy recovery, and the maximum involution was inspected within the first 3 months. In conclusion, the maturation time of myometrial scar tissue in uncomplicated cesarean sections, which can be evaluated by the signal alterations in MRI, is approximately 3 months, whereas the complete involution and the recovery of the zonal anatomy need at least 6 months.

Adolescent↗
PubMed1994

Magnetic resonance imaging in the staging of renal cell carcinoma.

Correct diagnosis and accurate staging of renal cell carcinoma are critical in the evaluation of prognosis and subsequent treatment planning. Between October 1989 and April 1993, 25 patients with histologically proven renal cell carcinoma (RCC) were studied, comparing magnetic resonance imaging (MRI), computerized tomography (CT), operative findings and histopathological results. Two patients with pT3 tumours were understaged by both methods as T2. Three other patients staged as T4 by CT and T3 by MRI were actually pT3. N and V status were accurately detected by both imaging modalities. One patient with biopsy-proven liver metastasis missed by CT was correctly diagnosed by MRI. We conclude that MRI is complementary to CT and is especially helpful in patients with advanced stage and large sized tumours.

Adult↗
PubMed1992

Magnetic resonance imaging and computed tomography in the detection and localization of intraocular foreign bodies.

In this experimental study, various foreign bodies were inserted into fresh bovine eyes, in different localizations. Twenty-one magnetic and non-magnetic foreign bodies, dimensions of which varied from 1.5 x 1.5 x 2 mm to 3.5 x 6 x 7 mm, were tried to detect by computed tomography (CT) and magnetic resonance imaging (MRI) scanning. In addition, further dissections were applied to check the ocular damage attributable to movement of the foreign bodies. Ferromagnetic foreign bodies have been shown to move in the eye and the risk of torsional forces being applied to the ferromagnetic foreign body seemed to cause intraocular complications during MRI scanning. All of the foreign bodies that were implanted in bovine eyes were recognized on CT scanning, except intraocular lenses. As a general rule, metallic foreign bodies produced beam-hardening artifacts, but these artifacts did not cause any problem in detecting the localizations of foreign bodies.

Animals↗
PubMed1992

Spondylometaphyseal dysplasia, type VII.

Spondylometaphyseal dysplasia was first described by Kozlowski et al. in 1967 as a new dysplastic bone disease, characterized by metaphyseal dysplasia associated with generalized platyspondyly in the vertebral column [1]. Kozlowski et al. have pointed out the autosomal dominant transmission of this disorder at that time. However, later reports showed that the manner of genetic transmission and the degree of the manifestation of the radiological findings could be variable and accordingly seven types of spondylometaphyseal dysplasia were described [2]. In this article, three cases displaying one of the rare forms of spondylometaphyseal dysplasia, "type VII" are presented and the diagnostic findings as well as the differential diagnostic criteria are discussed.

Bone Diseases, Developmental↗
PubMed1992

Pulmonary blastoma: a rare case of childhood malignancy.

A case of pulmonary blastoma is presented with review of the radiographic, ultrasonographic and CT appearances of this rare malignant tumor of children. Pulmonary blastoma arises from primitive lung mesenchyma and histologically resembles fetal lung. The clinical presentation is usually respiratory distress. The prognosis of the disease is poor even if surgical resection, supplemental chemotherapy and radiation therapy are performed. We present a case of pulmonary blastoma who died two days after surgical resection.

Child, Preschool↗
PubMed1990

Swollen neck in children: a report of two cases.

Two cases of swollen neck during straining, coughing, or crying caused by internal jugular vein dilatation that were diagnosed by ultrasonography and computed tomography are presented. With a review of the literature the aetiology and diagnostic procedure are discussed.

Child↗