Abstract
Aim
To report on the clinical features of eccrine hidrocystoma involving the eyelid.
Methods
Data on a series of consecutive patients with histopathologically confirmed diagnosis were reviewed.
Results
Among 34 patients, 69 tumours were identified. The mean age at diagnosis was 59 years (range 39–91 years). The majority (71%) of patients had only a single tumour. The tumours appeared as a small (median size=1 mm) clear cystic lesion with 87% located near the eyelid margin.
Conclusions
The eccrine hidrocystoma is a benign small cystic tumour that characteristically occurs close to but does not involve the eyelid margin.
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Introduction
Eyelid tumours can be clinically classified as cystic, nodular, ulcerative, papillomatous, or infiltrating. Various types of sebaceous glands (Zeis and Meibomian) and sweat glands (eccrine and apocrine) are present in the eyelid and each type of gland can develop cystic pathology.
Eccrine sweat glands are widely distributed in the body and each gland consists of a single duct with a coiled deeper component.1 By contrast, the apocrine sweat glands are limited to the special regions such as axilla, nipple, external ear, external genitalia, and the eyelids.1 The apocrine glands are larger than the eccrine glands, are more numerous in the lower eyelid, and their ductal openings are closely associated with eyelashes.2
Eccrine hidrocystoma is a cutaneous lesion that occurs predominantly on the face.3, 4 Clinical manifestations include either multiple (Robinson type)5 or solitary lesions (Smith and Chernosky type).6 Eccrine hidrocystoma is believed to represent cystic dilatation of intradermal sweat ducts rather than a neoplastic proliferation.6 Although cases of rare sweat gland tumours of the eyelids have been reported previously,7 there is limited information about the clinical features of eccrine hidrocystoma involving the eyelids. In this report, we present the clinical features of 34 consecutive patients with histopathologically proven eccrine hidrocystoma, so as to facilitate improvement in clinical recognition.
Materials and methods
Data from all patients with a histopathologically proven diagnosis of eccrine hidrocystoma treated at the Department of Ophthalmology, Royal Hallamshire Hospital, Sheffield between March 1994 and March 2002 were retrospectively collected. During this period, approximately 1000 eyelid biopsies were performed. Clinical records, drawings, external photographs (where available), and histopathology of all cases were reviewed. In addition to basic demographic data, detailed ophthalmic clinical features such as extent of involvement (unilateral/bilateral; upper/lower eyelid), number (per patient), distribution (medial/central/lateral/diffuse), size (largest dimension), and colour (clear/brown/blue) of the tumour was also investigated. The location of the tumour was classified as marginal (epicentre of the lesion within 4 mm of the eyelid margin), palpebral (epicentre of the lesion more than 4 mm of the eyelid margin and up to the paplebral sulcus) and orbital (epicenter of the lesion beyond the palberal sulcus).
Results
Among 34 patients (male patients=19; female patients=15), 69 tumours involving 38 eyes (right eye only=16 patients; left eye only=14 patients; and both eyes=four patients) were identified and they formed the basis of the present study (Table 1 ). The mean age at diagnosis was 59 years (range 39–91 years). Most of the patients (71%) had only one tumour, nine patients (26%) had up to 10 tumours, and only one patient had more than 10 tumours. Of the 69 tumours, about one-third (22 of 69) involved the lower eyelid and two-thirds (47 of 69) involved the upper eyelid. The tumours were predominantly (87%) near the eyelid margin and tended to be along the medial (36%) or lateral (32%) aspects (Figure 1). Almost all (97%) tumours were less than 10 mm in size with the vast majority (75%) of them less than 5 mm in maximal diameter. About one-third of all tumors were 1 mm or less in size. The mean tumour size was 4 mm. The tumours appeared as a clear cyst (90%) with brown pigmentation observed in only six tumors (9%). All tumors were excised completely without recurrence.
Discussion
Benign adnexal lesions of the eyelids are much more frequent than the malignant lesions.8, 9 In a series of 864 eyelid lesions that were biopsied, 82% were benign.8 The frequency of eccrine hidrocystoma is not known. In a series of 130 sweat gland lesions of the eyelids seen at Armed Forces Institute of Pathology, Washington, DC, hidrocystoma represented 22% of all cases.10 A clinicopathological series of 55 sweat gland tumours involving the eyelids did not include any cases of eccrine hidrocytoma.7 Our series of 34 patients with eccrine hidrocystoma represents less than 5% of all eyelid biopsies performed during the study period.
The accuracy of clinically suspecting a malignant eyelid tumour is reported in the range of 90%.8, 9 However, no such figures are available when evaluating benign eyelid lesions. The differential diagnosis of eccrine hidrocystoma includes other cystic lesions of the eyelid such as follicular derived cysts, epidermal inclusion cyst, haemangioma, lymphangioma, apocrine hidrocystoma, and eccrine acrospiroma. Eccrine hidrocystoma can be differentiated clinically from the apocrine hidrocystoma (cyst of Moll)11 by the location of the tumour in relation to the eyelid margin. In contrast to apocrine hidrocystoma, the eccrine hidrocystoma does not involve the eyelid margin. This is due to the fact that the eccrine sweat glands are distributed throughout the eyelid skin and are not confined to the eyelid margin unlike the apocrine glands. In addition, the apocrine hidrocystoma tend to have bluish colour with yellow apical deposits.12
Our observations indicate that a typical eccrine hidrocystoma of the eyelid manifests in an adult as a solitary clear cystic lesion although cases with simultaneous bilateral involvement have also been reported.13 The tumour is usually located along the medial or lateral aspect of the eyelid. The eccrine hidrocystoma characteristically occurs close to but does not involve the eyelid margin. It is rare for eccrine hidrocystoma of the eyelid to be larger than 10 mm and on average they measure 4 mm in the largest dimension. These set of findings should help in the clinical recognition of eccrine hidrocystoma.
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Singh, A., McCloskey, L., Parsons, M. et al. Eccrine hidrocystoma of the eyelid. Eye 19, 77–79 (2005). https://doi.org/10.1038/sj.eye.6701404
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DOI: https://doi.org/10.1038/sj.eye.6701404
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