Computerized tomography and 3-D rendering help to select surgical strategy in leiomyosarcoma of the inferior vena cava.

Leiomyosarcoma of the inferior vena cava is a rare tumor that is usually fatal. The tumor may grow very slowly or occasionally very rapidly, shows extensive local invasion, and metastasizes more frequently than previously believed. Complete surgical resection remains the only potential curative therapeutic option. The aim of this study was to report the clinical experience in the management of a patient with leiomyosarcoma. A 65-year-old woman with a history of vague abdominal pain and leg swelling underwent computed tomography which demonstrated an occlusion of the inferior vena cava. The patient received a complete excision of the tumor without reconstruction and histological analysis confirmed the diagnosis of leiomyosarcoma type 1. At 3 years, the patient is still doing well with minimal leg edema and a contrast-enhanced CT demonstrates no evidence of recurrence locally or in distant sites. Leiomyosarcoma is a rare and aggressive tumor that presents with non-specific symptoms. Computerized tomography with 3-D reconstruction is a useful tool to define the presence and entity of the collateral circulation and therefore to decide on the surgical strategy. Resection probably offers the best opportunity for long-term survival.

Coronary imaging of anomalous origins and aneurysms of the left coronary artery by multislice computed tomography.

In this paper, we describe two cases of anomalous origin of the left coronary artery and two cases of aneurysm on the left coronary artery. Detailed three-dimensional images were acquired by the multislice computed tomography (MSCT) SOMATOM Sensation Cardiac 64 during clinical studies of cardiac diseases.

Detection of coronary artery anomalies and coronary aneurysms by multislice computed tomography coronary angiography.

We report some variants, anomalies and aneurysms of the coronary artery tree observed in patients referred to our radiology department for suspected or known coronary artery diseases. 265 patients, with heart rate < 70 beats per minute and stable clinical conditions, underwent 64-MSCT. They were intravenously given contrast medium followed by saline as a chaser. Images and data were reconstructed and evaluated by two radiologists. Seven out of these patients (5 males and two females) were found to have abnormalities (variants or anomalies) of coronary arteries or coronary aneurysms, with an incidence respectively of 1.88% and 0.75%. Two patients had an anomalous origin of the left coronary artery from the pulmonary artery, as previously described (Castorina S et al., 2008). As regards the other patients, one had separate origins of the anterior descendant and circumflex arteries from the left lateral sinus with two ostia, one had quadrifurcation of the left coronary trunk, one had agenesis of the left coronary ostium and trifurcation of the right coronary artery and two had coronary aneurysms. Images acquired by 64-MSCT, because of their spatial dislocation, permit anatomical study from different perspectives. Our data confirm the ability of MSCT to evaluate, in a few seconds, anomalies of coronary arteries offering additional information for a more complete diagnosis.

Heart, aorta, peripheral and supra aortic trunks imaging realized by MSCT 64. Our experience.

A new generation of Multislice Computed Tomography (MSCT 64) was introduced by Siemens in Italy in the end of 2004. It acquires 64 slices per rotation and provides significantly improved image quality with drastically reduced scan times. This technique allows newer applications, particularly in vascular, cardiac, and colonic imaging. We investigated the accuracy of MSCT 64 in 120 patients for the detection of high-grade coronary-artery stenoses and occlusions. A detailed description of the most intriguing images (big vessels of mediastinum, supra aortic trunks, collateral circulation in an aortic pathology, aortic fissuration) is reported. MSCT 64 (multislice CT 64) represents an undisputed technological evolution of the imaging in the living being. Contrary to conventional coronary angiography (CCA), it enables to carry out noninvasive angiography in various settings, providing potential diagnostic and prognostic applications.

The bioartificial thyroid: a biotechnological perspective in endocrine organ engineering for transplantation replacement.

A new concept for ex situ endocrine organ bioengineering is presented, focused on the realization of a human bioartificial thyroid gland. It is based on the theoretical assumption and experimental evidence that symmetries in geometrical coordinates of the thyroid tissue remain invariant with respect to developmental, physiological or pathophysiological transformations occuring in the gland architecture. This topological arrangement is dependent upon physical connections established between cells, cell adhesion molecules and extracellular matrix, leading to the view that the thyroid parenchyma behaves like a deformable "putty", moulded onto an elastic stromal/vascular scaffold (SVS) dictating the final morphology of the gland. In particular, we have raised the idea that the geometry of the SVS per se provides pivotal epigenetic information to address the genetically-programmed, thyrocyte and endothelial/vascular proliferation and differentiation towards a functionally mature gland, making organ form a pre-requirementfor organ function. A number of experimental approaches are explored to obtain a reliable replica of a human thyroid SVS, and an informatic simulation is designed based on fractal growth of the thyroid intraparenchymal arterial tree. Various tissue-compatible and degradable synthetic or biomimetic polymers are discussed to act as a template of the thyroid SVS, onto which to co-seed autologous human thyrocyte (TPC) and endothelial/vascular (EVPC) progenitor cells. Harvest and expansion of both TPC and EVPC in primary culture are considered, with specific attention to the selection of normal thyrocytes growing at a satisfactory rate to colonize the synthetic matrix. In addition, both in vitro and in vivo techniques to authenticate TPC and EVPC lineage differentiation are reviewed, including immunocytochemistry, reverse trascriptase-polymerase chain reaction, flow cytomery and proteomics. Finally, analysis of viability of the thyroid construct following implantation in animal hosts is proposed, with the intent to obtain a bioartificial thyroid gland morphologically and functionally adequate for transplantation. We believe that the biotechnological scenario proposed herein may provide a template to construct other, more complex and clinically-relevant bioartificial endocrine organs ex situ, such as human pancreatic islets and the liver, and perhaps a new approach to brain bioengineering.