ACUTE ABDOMEN IN THE OLDEST-OLD: ETIOLOGIES AND MORTALITY OUTCOMES IN NONAGENARIANS. - ERDEMİR, Ahmet Gürkan; BOLUKÇU, Ayşenur; AKÇİÇEK, Esra; KAHRAMAN, Gökhan; BATUR, Ali; İDİLMAN, İlkay Sedakat; ONUR, Mehmet Ruhi; AKPINAR, Erhan (Turkish Journal of Geriatrics / Türk Geriatri Dergisi, 2026)