The maxillary sinus floor elevation procedure has gained popularity with predictable results, and is a safe, acceptable technique for bone augmentation, providing a base for dental implant treatment. Faint radiopaque lesions at the base of the maxillary sinus are frequent diagnoses on radiographs and must be identified during dental implant planning. Pseudocysts classically appear hemispheric, homogeneously opaque, and well delineated in panoramic and periapical radiographs. The great majority of these lesions are asymptomatic and do not require surgical treatment. In this case report, we present 4 patients who had a maxillary sinus floor elevation procedure using either crestal or lateral approaches in the presence of antral pseudocysts. No complications were encountered during follow-up periods in these patients and all implants are functioning successfully.
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