chronic invasive fungal sinusitis
Chronic invasive fungal sinusitis is a form of invasive fungal sinusitis.
The condition has a more prolonged course than acute invasive fungal sinusitis, usually more than 12 weeks . Patients are usually immunocompetent or have a milder level of immunocompromise. There may be a history of chronic sinusitis.
CT usually shows homogeneous opacification of the affected sinus(es), iso- to hyperattenuating to muscle tissue.
Other suggestive features include:
- relative lack of expansion of sinuses
- mottled lucencies or irregular bone destruction may be seen
- bone erosion localized to the area of extrasinus extension
- extrasinus component of the disease more prominent than the intrasinus component
- there may also be sclerotic changes in the bony walls of the affected sinuses representing chronic disease
Signal characteristics of affected region include:
- T1: iso- or hypointense signal
- T2: usually markedly hypointense signal
- acute invasive fungal sinusitis
- clinical setting of less than 4 weeks
- usually does not show hyperdense material within the sinus
- bony sclerotic changes are uncommon
- chronic granulomatous invasive sinusitis
- indistinguishable on imaging
- complicated chronic sinusitis
- sinonasal carcinoma
- sinonasal non-Hodgkin lymphoma