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Introduction: The causes of spontaneous enophthalmos, without trauma, surgical factors, or systemic illness, which can be found are rare. A particular entity called silent sinus syndrome in the Anglo-Saxon literature, which concerns the long-term effect of hypoventilation of the maxillary sinus responsible for an attraction of the sinus walls, resulting in sagging of the orbital floor, itself responsible for the enophthalmos., Case Report: We report the case about a 29-year-old woman, presenting a left-side spontaneous enophthalmos, with sinus-type pains for 2 months. The clinical examination revealed a horizontal diplopia when looking leftwards. Computed tomography showed a maxillary homolateral sinusitis with characteristic attraction of the sinus walls. The draining of the sinus collection by inferior endoscopic enlargement of the maxillary ostium led to pain resolution. The enophthalmos and diplopia were stabilized., Conclusion: After eradicating the orbital causes of enophthalmos, the sinus causes were sought more precisely, the pauci-symptomatic causes such as the silent sinus syndrome. The recognition of this syndrome stopped the progression of enophthalmos by making the maxillary sinus permeable again. A surgical reconstruction of the orbital floor can be proposed in order to correct the motility of the eyes and esthetic considerations.