This systematic review and meta-analysis investigate anatomical variations in the maxillary sinus (MS) and their clinical implications. The study analyzed 26 articles with 12,969 samples, revealing that anatomical variations such as Haller cells, Concha Bullosa, and septa are common, with prevalence rates of 0.30, 0.36, and 0.39, respectively. These variations can lead to sinusitis, tumors, or complications affecting neighboring structures. The review emphasizes the complexity of distinguishing anatomical variations from pathological abnormalities, highlighting the importance of understanding these variations for clinical decision-making. The MS is a complex structure with variations in architecture, dimensions, and morphology, and its variations can influence dental procedures, sinusitis, and other conditions. The study also notes that anatomical variations like hypoplastic sinus, mucosal thickening, and nasal septal deviation are associated with various clinical outcomes, including increased risk of complications during surgery. The review concludes that knowledge of these variations is crucial for clinicians, as they can impact diagnosis, treatment planning, and patient care. The study's findings underscore the need for further research to better understand these variations and their clinical implications.This systematic review and meta-analysis investigate anatomical variations in the maxillary sinus (MS) and their clinical implications. The study analyzed 26 articles with 12,969 samples, revealing that anatomical variations such as Haller cells, Concha Bullosa, and septa are common, with prevalence rates of 0.30, 0.36, and 0.39, respectively. These variations can lead to sinusitis, tumors, or complications affecting neighboring structures. The review emphasizes the complexity of distinguishing anatomical variations from pathological abnormalities, highlighting the importance of understanding these variations for clinical decision-making. The MS is a complex structure with variations in architecture, dimensions, and morphology, and its variations can influence dental procedures, sinusitis, and other conditions. The study also notes that anatomical variations like hypoplastic sinus, mucosal thickening, and nasal septal deviation are associated with various clinical outcomes, including increased risk of complications during surgery. The review concludes that knowledge of these variations is crucial for clinicians, as they can impact diagnosis, treatment planning, and patient care. The study's findings underscore the need for further research to better understand these variations and their clinical implications.