## 3 Results
### Classification Proposal  
Based on the following, the authors want to suggest their own classification proposal mostly based on radiological findings, where clinical symptoms play a secondary role in either confirming or neglecting the following MS deformities based on SSS/CMA findings [20; 21; 22; 23; 24; 25; 26; 27; 28; 29; 30; 31; 32; 33]. Type 0 MS (Figure 1) is a typical MS, with healthy, clear OMC, full symmetry, and no opacification. The authors' proposal on SSS/CMA divides them into types and sub-types of classification based on the literature [15; 16; 17; 18; 19] and their own observations:  
1. Type 1 SSS (pure SSS = pSSS) (Figure 2) MS four (4) wall retraction, OMC not patent, opacification present;
2. Type 2 in-pure SSS (iSSS) (Figures 3, 4 and 6) related to maxillary deformation (might be related to maxilla-mandibular skeletal class II/III deformities or others), clinically asymptomatic, not related to trauma or surgery, 1-3 MS walls retracted, OMC clear, no opacification, like suggested by [PERSON] et al., the \"not so silent sinus\" [18];
3. Type 3 CMA (pure form of chronic maxillary atelectasis--PCMA) (Figure 7), suggested by [PERSON] and [PERSON] [17], corresponding to the clinical presentation of CRS, pain, and symptomatic sinus manifestation, complete sinus opacification;
4. Type 4 CMA (an in-pure form of chronic maxillary atelectasis--iCMA) (Figure 8), corresponding to the clinical presentation of CRS, pain, and symptomatic sinus manifestation, however lacking a complete sinus opacification; OMC function might not be disturbed, 1-4 MS walls can be retracted;
5. Type 5 Mixed form SSS-CMA on both MCs (Figure 9)--present asymmetrically, combines both forms of SSS and CMA in pure or in-pure forms;
6. Type 6 atypical SSS or CMA (tsoSSS/tsoCMA--trauma, surgery, or other related SSS/CMA) of post-traumatic occurrence, post-surgical, or other iatrogenic related, such as suggested by [PERSON] et al. [30];
7. Type 7 MSH = maxillary sinus hypoplasia (Figures 10 and 11)--a very rare, probably somehow atypical case of complete symmetrical MS retraction and atrophy, without \begin{table}
\begin{tabular}{c c c c c c c c} \hline  & \multicolumn{3}{c}{**SSS**} & \multicolumn{3}{c}{**CMA**} & \\ \cline{2-7}  & **Pure** & **In-Pure** & **Pure** & **In-Pure** & **SSS-CMA** & **MSH** & **\(p\)**-Value** \\  & **/pSSS** & **/iSSS** & **/pCMA** & **/iCMA** & **(\(n\) = 1)** & **(\(n\) = 1)** & **(\(n\) = 1)** & **\(p\)**-Value** \\  & **(\(n\) = 5)** & **(\(n\) = 5)** & **(\(n\) = 1)** & **(\(n\) = 1)** & & & \\ \hline Spontaneous unilateral enophthalmos & 5 & 3 & 1 & 1 & 0 & 0 & 0 \\  & (100.0) & (60.0) & (100.0) & (100.0) & (0.0) & (0.0) & 0.074 \\ Hypoglobus & 0 & 1 & 0 & 0 & 0 & 0 & 0 \\  & (0.0) & (20.0) & (0.0) & (0.0) & (0.0) & (0.0) & 0.821 \\ Facial asymmetry & 4 & 4 & 0 & 1 & 0 & 0 & 0 \\  & (80.0) & (80.0) & (100.0) & (100.0) & (0.0) & (0.0) & 0.143 \\ Asymptomatic maxillary sinusitis & 5 & 5 & 0 & 0 & 1 & 0 & 0.012 \({}^{*}\) \\  & (100.0) & (100.0) & (0.0) & (0.0) & (100.0) & (0.0) & 0.012 \({}^{*}\) \\ Diplopia in severe cases & 0 & 0 & 0 & 0 & 0 & 0 & 0 \\  & (0.0) & (0.0) & (0.0) & (0.0) & (0.0) & (0.0) & 1.000 \\ CRS presence & 0 & 0 & 1 & 1 & 0 & 0 & 0.043 \({}^{*}\) \\  & (0.0) & (0.0) & (100.0) & (100.0) & (0.0) & (0.0) & 0.043 \({}^{*}\) \\ \hline Mid-facial asymmetry & 5 & 3 & 0 & 0 & 0 & 0 & 0 \\  & (100.0) & (60.0) & (0.0) & (0.0) & (0.0) & (0.0) & 0.029 \({}^{*}\) \\ Maximillary asymmetry & 5 (100.0) & 4 & 1 & 1 & 1 & 0 & 0.262 \\  & (80.0) & (100.0) & (100.0) & (100.0) & (0.0) & 0.069 \\ Facial pain/pressure & 0 & 1 & 1 & 0 & 1 & 0 & 0.089 \\  & (0.0) & (20.0) & (100.0) & (0.0) & (100.0) & (0.0) & 0.089 \\ Headaches & 0 & 0 & 1 & 0 & 1 & 0 & 0.042 \({}^{*}\) \\ Nasal obstruction with/without taste & 0 & 0 & 1 & 1 & 1 & 0 & \\  & and smell variations & (0.0) & (0.0) & (100.0) & (100.0) & (0.0) & 0.012 \({}^{*}\) \\ \hline \end{tabular} SSS: silent sinus syndrome; CMA: chronic maxillary atelectasia; MSH: maxillary sinus hypoplasia; \({}^{*}\): statistically significant.  
\end{table}