CT findings of the lipomas in the neck

Abstract

Ordinary lipomas are the most common neoplasm ofmesenchymal origin. About 13% ofthem arise in the head and neck region. especially in the posterior neck. More than 80% of lipomas are ordinary lipoma, and histologically they are composed of mature fat.CT scan provides a definite diagnosis of lipoma in virtually all cases due to their characteristic finding ' a homogenous. well.defined low.atte nuation mass that usually m easures between -65 to -125 HU The authors reviewed the clinical and CT characteristics of 14 cases of lipoma in the neck.The results were as follows:1. A palpable nec k m ass was the most common symptom having a variable duration (months to years). 2. The age distribution of the patients was from 29 to 64 years, and the 6th decade was the most commonly af.

Catalytic and Mechanistic Insights of the Low‐Temperature Selective Oxidation of Methane over Cu‐Promoted Fe‐ZSM‐5

“…Given the poor solubility of traditional hydroxyl radical scavengers such as benzoquinones in the aqueous medium, an inorganic scavenger (Na 2 SO 3 ) was utilised. [17] As expected, the homogeneous Fentons system, which can only oxidise methane by the production of hydroxyl and hydroperoxyl radicals (Reactions 9 and 10), is significantly retarded by the presence of the radical scavenger, and a 75 % decrease in activity was observed over the 30 min reaction period. Conversely, no decrease in activity was observed for the heterogeneous ZSM-5 catalyst under similar conditions.…”