Vascular involvement and thrombosis is seen in

Mucormycosis occurs as a systemic infection following dissemination from a primary focus in the upper respiratory tract or nasal cavity, where the spores germinate and the mycelia invade the adjacent tissues- orbit, sinuses and the brain. When the lung is the primary site of infection, the fungi may invade the aeries to cause thrombosis and infraction. Ref: Textbook of Microbiology, Ananthanarayan and Paniker; 9th edition