Abstract
Poroid hidradenoma is a benign eccrine neoplasm of the poroma family. We report a 65-year-old male patient who presented to his general practitioner with a poroid hidradenoma in zone 2 of the flexor surface of his left middle finger. Diagnosis was confirmed histologically, after which the patient was referred to us for wider excision. Although poroid hidradenoma is a benign tumour, wide local excision is mandatory. Here we discuss the reasoning behind this and present a rationale for excision margins.
Highlights
Poromas are typically benign sweat gland neoplasms that account for 10% of sudoriferous tumours, which themselves represent around 1% of primary skin lesions [1]
One paper reported a case of vulvar poroid hidradenoma, leading the authors to agree with others in that there is no true site of predilection for this rare tumour [5] [6]
Poroid hidradenoma is an increasingly recognised neoplasm, with more cases being reported across the globe, and diagnostic techniques successful in setting it apart from other members of the poroma family
Summary
Poromas are typically benign sweat gland neoplasms that account for 10% of sudoriferous tumours, which themselves represent around 1% of primary skin lesions [1]. In 1990, Abenoza and Ackerman put forward the addition of a fourth member to this poroma family—poroid hidradenoma [2]. This is an uncommon, benign neoplasm with eccrine differentiation, so-called because it is a hybrid lesion with morphology intermediate between a poroma and a hidradenoma [3]. When the neoplastic poroid and cuticular cells (i.e. features of a poroid neosplasm) are in a tumour with solid and cystic components, all within the dermis without connection to the epidermis (i.e. features of a hidradenoma), the neoplasm is called poroid hidradenoma [4]. We present an overview of poroid hidradenoma and a case demonstrating a typical presentation and management pathway. We suggest a hypothesis for this, as yet to be described in the current literature
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