When Minor Edits Matter: LLM-Driven Prompt Attack for Medical VLM Robustness in Ultrasound. - Yasamin Medghalchi; Milad Yazdani; AmirHossein Dabiri Aghdam; Moein Heidari; Mojan Izadkhah; Zahra Kavian; Giuseppe Carenini; Lele Wang; Dena Shahriari; Ilker Hacihaliloglu (CoRR, 2026)