Systemic disease associations and management of pyoderma gangrenosum: a single-center retrospective case series. - El Kassimi, Ilyas; Rkiouak, Adil; Sahel, Nawal; Zaizaa, Meryem; El Bougrini, Zineb; Talamoussa, Bilal; Sekkach, Youssef (European Journal of Medical Case Reports, 2026)