<prompt> Mucormycosis of paranasal sinus is most common inHIVDiabetesThose on immuno suppressantsPost surgical  <response>: MUCORMYCOSIS: Caused by - rhizopus , rhizomucor , cunninghamella Moulds with non septate hyphae The higher prevalence of mucormycosis in India turned out to be statistically significant p 0.0001 in comparison with all other countries Predisposing factors - Organ transplant recipients - Long term desferroxamine therapy - Immunosuppression due to steroids or cytotoxic drugs Hematological malignancy - Diabetics - Chronic renal failure Five forms Rhinocerebral most common site Pulmonary mucormycosis 2 most common Cutaneous Gastrointestinal Disseminated Diagnosis: Microscopy and biopsy show organisms that appears as broad ribbon like usually non septate hyphae which branch at right angles 