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INTRODUCTION: Maxillary sinus mucocele is an unusual clinic entity (incidence of 3-10%), represented by mucous secretion
lined by respiratory stratified pavemented epithelium and its origin is mainly secondary to infections, inflammations,
surgery, trauma or neoplasia.
CASE REPORT: We present a case of maxillary sinus mucocele. Subject of the study is a 74 aged patient referring positive
anamnesis for nasal cavity surgery. His symptoms appeared six months ago and he complainted vertical ocular diplopia
and ocular tension sensation, without rhinologic complaints. Oculistic examination confirmed an isolated left inferior
rectus palsy, and CT showed mucous secretion occupying left maxillary sinus, with bone erosion to the orbital floor
until orbital muscles. MRI is the gold standard for differential diagnosis with neoplastic lesions but the patient refused
to perform this radio-diagnostic exam. He underwent to Endoscopic sinus surgery, consisting in middle meatal antrostomy
and removal of the mucocele. Four months later the endoscopic follow-up showed regular maxillary cavity and regular
CONCLUSION: In our opinion the rebuilding of the eroded bone is not mandatory if the integrity of the maxillary upper
wall mucosa is respected, and antrostomy with drainage allows to recover ocular and paranasal sinus function.