Perfusion in ENT imaging

AbstractPerfusion MRI is an essential part of characterizing salivary gland tumors. The shape of the curves can provide a guide as to the type of lesion: benign (ascending plateau) or malignant (descending plateau), and can also occasionally strongly suggest a histological type such as a Warthin tumor (intense, rapid contrast enhancement with washout>30%). Perfusion imaging (CT or MRI) for other head and neck tumors is currently being developed and is being assessed. It should be a tool to assist in choosing the most appropriate initial treatment (chemotherapy, radiotherapy or surgery) and should also allow poor responders to conservative treatment to be identified and recurrences to be detected in post-treatment damaged tissues. Aims: (a) to determine when to perform perfusion MRI; (b) to determine the type of perfusion to carry out: CT, T1-weighted MRI; (c) to determine how to position the region of interest to plot the perfusion curve; (d) to know how to interpret MRI curves for salivary gland tumors; (e) to know how to interpret the information obtained from perfusion CT or MRI for the upper aerodigestive tract

Intraparotid Kimura disease

SummaryIntroductionIntraparotid locations are extremely rare in Kimura disease, especially in Europe.Case reportA 31-year-old man presented with intraparotid Kimura disease, managed by parotidectomy.Discussion/conclusionThe case was analyzed in the light of a review of the literature, focusing on the diagnostic and anatomopathologic problems encountered, and the physiopathology and treatment of this pathology. Any parotid mass found in a patient of Far-Eastern origin showing hypereosinophilia should suggest a diagnosis of intraparotid Kimura disease

Dynamic Analysis of a Disequilibrium Macroeconomic Model with Dual Labor Markets

We extend the general disequilibrium model of Malinvaud(1980) by using dual labor market theory. By considering two tiers of workers, we find that while the duality of the labor market expands an equilibrium regime in the short term, it does not always keep an equilibrium in the medium term. In the medium term, the business cycle converges toward a disequilibrium regime unless the goods market is potentially in equilibrium. Employment and wages at the steady state are affected by the size of the government, and the stability of wage bargaining is only a sufficient condition of the local stability of our dynamic system. Therefore, involuntary unemployment can be remedied only when goods demand is sufficiently large

GIS and spatial data analysis: Converging perspectives

We take as our starting point the state of geographic information systems (GIS) and spatial data analysis 50 years ago when regional science emerged as a new field of enquiry. In the late 1950s and 1960s advances in computing technology were making possible forms of automated cartography that in due course would lead to th

Malinvaud on Wicksell’s legacy to capital theory: some critical remarks

This critique of Malinvaud’s article of 2003 on Wicksell’s legacy to capital theory focuses in particular on three points raised there. The first regards the given amount of existing capital that appears in Wicksell’s theory and its connection with his alleged “missing equation”, the second the particular notion of the marginal product of capital adopted by Malinvaud and the meaning of its equality with the rate of interest, and the third the concept of the average period of production taken by Malinvaud from Hicks and its inverse relation to the rate of interest