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A Case of Idiopathic Orbital Sudoriferous Cyst in an Adult

Purpose: To report a rare case of an idiopathic sudoriferous cyst involving the orbit in an adult. Case summary: A 52-year-old male visited our clinic with an orbital mass in the right eye, which had developed 4 months prior to admission. A 2 × 1.5 cm-sized hard orbital mass was palpated in the middle area of the right upper orbit. On sonographic imaging, a well-demarcated tumor was identified that showed no echogenicity. We performed anterior orbitotomy with a lid crease incision. The tumor was completely removed. Histopathological examination showed a solitary cyst lined with two or three layers of cuboidal epithelial cells with scattered goblet cells. The tumor was classified as a sudoriferous cyst. Conclusions: Sudoriferous cyst should be considered in the differential diagnosis of a well-circumscribed mass lesion involving the orbit in adult patients.