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Fig. 5 | BMC Medical Imaging

Fig. 5

From: Development of CT-based methods for longitudinal analyses of paranasal sinus osteitis in granulomatosis with polyangiitis

Fig. 5

Discriminative value of diameter ratio measurement (DRM) in patients with maximum score in global osteitis scoring scale (GOSS). The DRM and GOSS are calculated for a single sinus in (a) and (b). In (a) we show GOSS and DRM development for the left maxillary sinus of a GPA patient. There is a gradual ceiling effect of the GOSS (upper, left plot) while the DRM decreases continuously across the observation period (lower plot). Below the plots is a slice from the baseline (far left) and last CT of this patient. In (b) we show similar data from the left sphenoid sinus of a patient where the GOSS for this sinus had reached its highest score (GOSS = 5) already at the baseline CT (immediate ceiling effect; upper, right plot), but the DRM can still measure the progression of the osteitis (lower plot). The accompanying CT images show that the left sphenoid sinus is almost obliterated at the last CT (far right image)

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BMC Medical Imaging

ISSN: 1471-2342

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