Sudoriferous cyst of the orbit

Purpose: A case of sudoriferous cyst of the orbit in an adult patient is re ported. This unusual cyst in the orbit has heretofore been reported only in congenital cases. Methods: Case report. Results: A 45-year-old woman sought treatment for an asymptomatic mass of t he left lower eyelid. Computed tomography of the orbits showed a cystic les ion in the inferior orbit with bony remodeling. Histopathologic examination showed the lesion to be a solitary cyst lined by two to three layers of cu boidal epithelial cells with eosinophilic cytoplasm. Some of the epithelial cells contained periodic acid-Schiff-positive, diastase-resistant granules . The pathologic diagnosis was a sudoriferous cyst. Conclusion: Sudoriferous cysts, although uncommon, should be included in th e differential diagnosis of orbital cystic tumors.