Benign osteoblastoma in an unusual mastoid location

SummaryIntroductionBenign osteoblastoma (OB) is an unusual primary bone tumor. The preferred locations are the posterior arch of vertebrae and long bones. We report herein an extremely rare location of an OB in the mastoid process of the temporal bone.Case reportA 22-year-old woman presented with painful left retro-auricular swelling. Computed tomography features were suggestive of an aggressive osteolytic lesion of the left mastoid. The pathologic examination of bone curettage material revealed a benign OB. A complete resection of the tumor was performed later, with no evidence of recurrence at 1 year.Discussion/ConclusionTo our knowledge, this is the 14th reported case of OB confined to the mastoid process of temporal bone. Its histological diagnosis can be difficult and osteosarcoma is its principal differential diagnosis. Although generally regarded as benign, OB has potential for recurrence and local invasion. As such, complete resection, whenever possible, is preferred over conventional curettage

COP27 climate change conference: Urgent action needed for Africa and the world

No Abstrac

From Architectured Materials to Large-Scale Additive Manufacturing

The classical material-by-design approach has been extensively perfected by materials scientists, while engineers have been optimising structures geometrically for centuries. The purpose of architectured materials is to build bridges across themicroscale ofmaterials and themacroscale of engineering structures, to put some geometry in the microstructure. This is a paradigm shift. Materials cannot be considered monolithic anymore. Any set of materials functions, even antagonistic ones, can be envisaged in the future. In this paper, we intend to demonstrate the pertinence of computation for developing architectured materials, and the not-so-incidental outcome which led us to developing large-scale additive manufacturing for architectural applications

Intérêt pronostique de l’infiltration du chorion dans les tumeurs vésicales pT1

Introduction: Les objectifs de notre travail sont d’évaluer l’impact pronostic de la profondeur d’infiltration tumorale du chorion et de l’envahissement ou non de la musculaire muqueuse des tumeurs pT1 de la vessie en étudiant les taux de récidive et de progression, les survies globale, sans récidive et sans progression. Patients et Méthodes: La relecture de toutes les lames a été effectuée pour déterminer la présence ou non de la musculaire muqueuse, son envahissement (pT1b) ou non (pT1a) et la profondeur d’envahissement du chorion (pT1 m: envahissement unifocal ≤ 0,5 mm ou pT1e: envahissement unifocal > 0,5 mm ou multiple). Résultats: En fonction de l’invasion de la musculaire muqueuse, les taux de récidive et de progression étaient plus fréquents pour les tumeurs pT1b par rapport à celles pT1a, avec un taux de récidive de 84.6% (p = 0,0012) et de progression de 38.5% (p = 0,003). En fonction du degré d’invasion du chorion, la récidive et la progression étaient plus fréquentes pour les tumeurs pT1e par rapport à celles pT1 m (respectivement 57.2 (p = 0,05) et 17.9% (p = 0.11)). La survie moyenne sans récidive était de 70.3 mois pour les tumeurs pT1a et 53.6 mois pour celles pT1b (p = 0,046), et elle était de 61.7 mois pour les tumeurs pT1e et de 55.5 mois pour celles pT1 m (p = 0,85). Conclusion: Le classement des ces tumeurs en fonction de l’importance d’envahissement du chorion et de l’infiltration de la musculaire muqueuse a prouvé son efficacité à travers les taux de récidive et de progression tumorale chez nos malades

Teratome kystique mature retro-vesical de l\'adulte: a propos d\'un cas

No Abstract. African Journal of Urology Vol. 13 (2) 2007: pp. 169-17

Chemical composition and antibacterial activity of essential oils from the Tunisian Allium nigrum L.

The chemical composition of the essential oils of different Allium nigrum L. organs and the antibacterial activity were evaluated. The study is particularly interesting because hitherto there are no reports on the antibacterial screening of this species with specific chemical composition. Therefore, essential oils from different organs (flowers, stems, leaves and bulbs) obtained separately by hydrodistillation were analyzed using gas chromatography–mass spectrometry (GC–MS). The antibacterial activity was evaluated using the disc and microdilution assays. In total, 39 compounds, representing 90.896.9 % of the total oil composition, were identified. The major component was hexadecanoic acid (synonym: palmitic acid) in all the A. nigrum organs oils (39.177.2 %). We also noted the presence of some sesquiterpenes, mainly germacrene D (12.8 %) in leaves oil) and some aliphatic compounds such as n-octadecane (30.5 %) in bulbs oil. Isopentyl isovalerate, 14-oxy-α-muurolene and germacrene D were identified for the first time in the genus Allium L. All the essential oils exhibited antimicrobial activity, especially against Enterococcus faecalis and Staphylococcus aureus. The oil obtained from the leaves exhibited an interesting antibacterial activity, with a Minimum Inhibitory Concentration (MIC) of 62.50 μg/mL against these two latter strains. The findings showed that the studied oils have antibacterial activity, and thus great potential for their application in food preservation and natural health product

Phytochemical study of the trunk bark of Citharexylum spinosum L. growing in Tunisia: Isolation and structure elucidation of iridoid glycosides

A phytochemical investigation of the trunk bark ethyl acetate extract of Citharexylum spinosum L. has led to the isolation of four previously undescribed iridoid glycosides, tunispinosides A-D, and five known phenylethanoid glycosides, verbascoside, leucosceptoside A, martynoside, isoverbascoside and plantainoside C, together with 4-hydroxy-2,6-dimethoxyphenyl 6'-O-vanilloyl-beta-D-glucopyranoside, two 8,3'-neolignan glycosides, plucheosides D-1-D-2, coniferyl aldehyde, vanillic acid, syringic acid, ferulic acid and tyrosol. All compounds were isolated for the first time from C. spinosum. Their isolation was carried out using silica gel column and high performance liquid chromatography (HPLC). Structures were established by spectroscopic means including 1D and 2D NMR experiments, and spectrometric ESI-HRMS analysis