This article aims at exploring the existing ideas of Angkola's local wisdom with relevance to the roles of philosophy, culture, language, and Islam. This research employed the ethnographic method which utilised the data from figurative peoples in Angkola culture, Angkola's cultural ceremonies, documents, and related media. The collected data were then reduced and analysed from philosophical, cultural, linguistic, and religious point of views to find the relevance. This research found that Dalihan Na Tolu covers triangle family members for Mora, Kahanggi, and Anak Boru. Dalihan Na Tolu consistently enhances humanity in harmony and it keeps warm in touch with the social profile. Angkola language has unique variations in the structure, coda sound, accent, and intonation to avoid saying subject as respect and the symbol of politeness. Dalihan Na Tolu creates and maintains norms in brotherhood and togetherness as an ingrained belief. The devotion poured in a sense of justice for triangle family members. The taste of brotherhood and togetherness is a fact that only humans have to think about expressing responsibility to unite humanity. The manifestation of Dalihan Na Tolu as a local, national, and perhaps international wisdom has faith, charity, and responsibility as the main point of view for humanity in harmony. The human faith in God has to be perfect with relevance for love, humanity and harmony. Charity humanises people. The responsibility unites humanity. Dalihan Na Tolu reflects many important values to learn from living in the society with particular philosophy, culture, langauge, and religion. CONTRIBUTION: This research describe about roles of philosophy, culture, language, and Islam in Angkola's local wisdom of "dalihan natolu" in South Tapanuli, Indonesia. This research contributes to providing a comprehensive understanding of how the values in the local wisdom "dalihan natolu" can create social harmonisation

Resumo Objetivo: Avaliar o desempenho da ressonância magnética (RM) na detecção de reação periosteal e comparar a classificação de presença ou ausência de reações periosteais entre a RM e a radiografia convencional (RC). Materiais e Métodos: Estudo retrospectivo incluindo 42 pacientes consecutivos (idade média, 22 anos; 20 homens) com diagnóstico confirmado de osteossarcoma ou sarcoma de Ewing, tendo exames de RM e RC adquiridos pré-tratamento. Três radiologistas avaliaram às cegas a presença ou ausência de reação periosteal e de cada subtipo de reação periosteal nas imagens de RC e RM: triângulo de Codman, multilamelada e espiculada. A RC foi usada como padrão de referência para cálculo do desempenho diagnóstico. Foi utilizado o coeficiente kappa para reprodutibilidade interobservador. Adicionalmente, foi realizado teste exato de Fisher bicaudal para avaliar se houve diferença significativa entre as leituras da RC e RM. Resultados: A RM mostrou alta especificidade, alto valor preditivo negativo e baixa sensibilidade na detecção de reação periosteal. A concordância interobservador para a reação periosteal foi quase perfeita para a RC e RM. A concordância interobservador para a classificação dos diferentes subtipos de reação periosteal foi maior para o subtipo triângulo de Codman e menor para o subtipo espiculada. Não houve diferença na detecção por RM e RC (p < 0,05). Conclusão: Não houve diferença significativa entre as classificações da presença ou ausência de reações periosteais entre os métodos RC e RM. A RM apresentou alta especificidade e concordância interobservador quase perfeita para a detecção de reação periosteal. A concordância interobservador para os diferentes subtipos de reação periosteal foi variável.

Abstract Objective: To evaluate the performance of magnetic resonance imaging (MRI) in detecting periosteal reactions and to compare MRI and conventional radiography (CR) in terms of the classification of periosteal reactions. Materials and Methods: Retrospective study of 42 consecutive patients (mean age, 22 years; 20 men) with a confirmed diagnosis of osteosarcoma or Ewing's sarcoma, MRI and CR images having been acquired pretreatment. Three blinded radiologists detected periosteal reactions and evaluated each periosteal reaction subtype in CR and MRI images: Codman's triangle; laminated; and spiculated. The CR was used as a benchmark to calculate the diagnostic performance. We used the kappa coefficient to assess interobserver reproducibility. A two-tailed Fisher's exact test was used in order to assess contingency between CR and MRI classifications. Results: In the detection of periosteal reactions, MRI showed high specificity, a high negative predictive value, and low-to-moderate sensitivity. For CR and for MRI, the interobserver agreement for periosteal reaction was almost perfect, whereas, for the classification of different subtypes of periosteal reaction, it was higher for the Codman's triangle subtype and lower for the spiculated subtype. There was no significant difference between MRI and CR in terms of the classifications (p < 0.05). Conclusion: We found no difference between MRI and CR in terms of their ability to classify periosteal reactions. MRI showed high specificity and almost perfect interobserver agreement for the detection of periosteal reactions. The interobserver agreement was variable for the different subtypes of periosteal reaction.