The differentiating factor between invasive and fulminant infections is that the progress of the disease is very rapid in fulminant. The progress of the disease is so quick that it can kill a person in a month if not treated. One of the most common type of fulminant fungal infection is mucormycosis. Signs and symptoms
Individuals with the condition of fungal sinusitis mostly present with features that include facial pain and pain around the eyes, nasal congestion, rhinorrhea(running nose), headache, later there may be ophthalmoplegia (paralysis of ocular muscles). Pathophysiology
The mechanism of fungal sinusitis depends on which form, such as:

Acute fulminant form – the fungus invades into vessels causing thrombosis, necrosis with minimum inflammation 
Chronic invasive – fungal hyphae invades tissue leaving necrosis with minimal inflammation 
Granulomatous form – invasive hyphae invades tissue with inflammation and non-caseating granuloma (with foreign bodies). Saprophytic infection – growth of fungus seen on mucous crusts within sinus cavity. Sinus fungal ball – sequestration of fungal hyphae as densely tangled, and has gritty matted appearance. Eosinophil related Allergic fungal sinusitis – though not completely understood, a possible mechanism sees the protein component of fungus elicits IgE mediated allergic mucosal inflammation. Diagnosis
In terms of diagnosis, the clinical examination gives an idea about fungal sinusitis, as well as:

Suggestive clinical features include - multiple recurrent episodes, persistent pathology, and absent ability to smell (the Eustachian tube may also be affected). X-Ray - can be done if the diagnosis is not certain.
CT – can document the presence of sinusitis, in the coronal views
MRI – used to find the CNS spread (extent of the disease), to evaluate individuals who demonstrate signs of invasive fungal sinusitis 
Histology studies

Treatment
Treatment for fungal sinusitis can include surgical debridement; helps by slowing progression of disease thus allowing time for recovery additionally we see the options below:

In cases where the fungus has invaded the sinus tissue, echinocandins, oral voriconazole, and I.V amphotericin may be used
For allergic fungal sinusitis, systemic corticosteroids like prednisolone, methylprednisolone are added for their anti-inflammatory effect, bronchodilators and expectorants help to clear secretions in the sinuses. Epidemiology
Though it is widely held that fungal infections of the nose and paranasal sinuses are not common, most agree that their frequency has been increasing over past decades. See also
Granuloma

References
Further reading
Thaler, Erica; Kennedy, David W. (2008). Rhinosinusitis: A Guide for Diagnosis and Management. Springer Science & Business Media. ISBN 9780387730622. Retrieved 22 February 2017. Aribandi, Manohar; McCoy, Victor A.; Bazan, Carlos (2007). "Imaging Features of Invasive and Noninvasive Fungal Sinusitis: A Review". RadioGraphics. 27 (5): 1283–1296. doi:10.1148/rg.275065189. PMID 17848691. == External links ==