2.1 Subjects
This study included 23 patients with FD involved in at least one paranasal sinus bone and in the adjacent skull base. There were 19 cases of MFD, 3 cases of PFD, and 1 case of MAS. The 23 patients included 12 females and 11 males. The median age was 33 (range, 2-67) years. The common symptoms were nasal obstruction (13 cases, 56.6%), rhinorrhea (9 cases, 39.1%), headache (7 cases, 30.4%), facial pain (6 cases, 26.1%), visual impairment (4 cases, 17.4%), snoring (5 cases, 21.7%), facial deformity (3 cases, 13%), and obvious exophthalmos (2 cases, 8.7%). There was no obvious epistaxis or diplopia. The clinical characteristics of the patients were listed in Table 1, 2 and 3.
This study was approved by the Ethics Committee of our hospital and conducted with written informed consent from patient.
All the patients received a thin slice computed tomography (CT) scan of the paranasal sinuses, including coronal and axial views. The CT scan revealed the lesion location and was helpful for diagnosis. The most common findings of FD on CT are an expanded bone with ground-glass appearance. The bone window showed that the image of a normal bone’s structure was replaced by the image of an ivory high-density pattern (Figure 1), a low-density pattern (Figure 2) or a frosted glass pattern (Figure 3A and 3B).