Region-Grounded Report Generation for 3D Medical Imaging: A Fine-Grained Dataset and Graph-Enhanced Framework. - Cong Huy Nguyen; Son Dinh Nguyen; Guanlin Li; Tuan Dung Nguyen; Aditya Narayan Sankaran; Mai Huy Thong; Thanh Trung Nguyen; Hong Son Mai; Reza Farahbakhsh; Phi Le Nguyen; Noël Crespi (CoRR, 2026)