LAUSR

Dear Editor, Glomus tumors are rare, benign vascular tumors, arising from the glomus body, an arteriovenous structure with thermoregulatory function. We describe an atypical presentation of a glomus tumor that occurred as a painless nodular eyelid mass. A 30-year-old male presented with a history of painless swelling in the right lower lid of 6 months duration, which had gradually increased in size (Fig. 1A). Best-corrected visual acuity in both eyes were 20 / 20. A non-tender, firm, nodular bilobed lesion with smooth surface about 3 mm away from the lid margin was noted in his right eye. No signs of inflammation were present and overlying skin was normal in appearance. It was neither adherent to skin above nor to the structure underneath. Posterior edge of the mass could be felt. Rest of the ocular examination was within normal limits. Left eye was unremarkable on examination. Provisional diagnosis of a solitary benign neurogenic tumor or an implantation dermoid was made. Patient underwent an excision biopsy of the mass. Intraoperatively, a 9 × 5 × 4-mm subcutaneous, bilobed, pink, non-encapsulated mass was seen (Fig. 1B). Unusually excessive bleeding was encountered during dissection following which the mass was completely excised. Histopathological examination of the tissue specimen revealed a well circumscribed neoplasm composed of irregularly dilated vessels, surrounded by collars of homogenous tumor cells forming nests (Fig. 1C). Tumor cells were uniform, round to oval with lightly eosinophilic cytoplasm having a centrally placed rounded or punched out nucleus. No atypia or mitoses was noted. The tumor cells were interspersed with smooth muscle cells. Immunohistochemistry further revealed strong cytoplasmic positivity for smooth muscle actin (Fig. 1D). These findings were consistent with the diagnosis of glomus cell tumor. Postoperative period was uneventful without any evidence of recurrence for the last 2 years. Glomus tumors are benign perivascular neoplasms, typically seen in young adults in the 3rd and 4th decade. They are known to arise from the glomus body, an arteriovenous anastomosis surrounded by smooth muscle cells. These are commonly seen in distal extremities of the body [1], subungual region of the fingers being the most common site. Ocular incidences of glomus tumors are rare. There have been very few cases of orbital glomus tumors reported in previous literature most of which presented as an orbital swelling with gradually increasing proptosis [1]. To the best of our knowledge and after a thorough literature search very few cases of these tumors in the eyelids have been reported. The occurrence of glomus tumors in the eyelid is rather rare and it may be suggestive of the presence of glomus bodies in the lid, although this has not been confirmed [2]. In 1941, Kirby [2] reported first case of glomus tumor which presented as an eyelid mass. Cases reported earlier Korean J Ophthalmol 2021;35(2):171-172 https://doi.org/10.3341/kjo.2020.0113