Mucormycosis is aggressive and potentially fatal in patients, particularly among diabetic patients suffering from ketoacidosis. A 16-year female patient came to the medical department with a complaint of fever for 15 days, cough and breathlessness, chest pain, and palpitation
for 10 days also had left orbital and facial swelling for 3 days. The patient is a known case of type 2 diabetes mellitus. On CT Scan PNS (Plain) showed a soft tissue thickening causing complete opacification of the left maxillary sinus extending to the left frontal, left ethmoid, and left he misphenoid sinuses. The treatment of debridement of necrotic tissue from the left maxillary sinus was done. On histopathology diagnosed as invasive mucormycosis. We are presenting this case of mucormycosis in diabetic patients suffering from ketoacidosis for its clinical, radiological, and histopathological findings and management of the disease. Early diagnosis and prompt treatment significantly improve survival and decreases morbidity.