Determination of variables for a more accurate diagnostic approach in suspected acute invasive fungal rhinosinusitis: A non‐concurrent cohort study

To describe a group of patients with suspected acute invasive fungal rhinosinusitis (AIFRS) diagnosis, and identify factors associated with a greater risk of presenting this disease.Non-concurrent cohort study.A single-centre non-concurrent follow-up of patients with suspected AIFRS between August 2015 and July 2018.50 inpatients referred due to suspected AIFRS at Hospital Clínico Universidad Católica based on the association of a predisposing factor (neutropenia/immunodeficiency/poorly controlled diabetes) with fever of unknown origin.The primary outcome was AIFRS diagnosis, defined as a concordant tissue biopsy.Acute invasive fungal rhinosinusitis was confirmed in 18% (9/50) of the evaluated patients. AIFRS was significantly associated with a positive galactomannan (P = .04), and a paranasal sinus MRI with lack of contrast enhancement (LoCE) (P = .04) orbit compromise (P = .03) or global extrasinusal extension (P = .04). LoCE and extrasinusal extension in the paranasal sinus/brain MRI were risk factors for AIFRS (OR 16; CI 1.2-210.6 and OR 12.75; CI 1.3-128.8, respectively). Conversely, a nasal endoscopy showing healthy mucosa was identified as a protective factor for AIFRS (OR 0.06; CI 0.007-0.57).In patients with suspected AIFRS, we identified laboratory and radiologic variables associated with the disease, which may help for a more accurate diagnostic algorithm and approach in this population.