Ann Dermatol.  2013 Feb;25(1):92-94. 10.5021/ad.2013.25.1.92.

Eccrine Poroma on the Postauricular Area: A Rare Presentation

• Choi YJ
• Kim HS
• Lee JY
• Kim HO
• Park YM

• KMID: 2265978
• DOI: http://doi.org/10.5021/ad.2013.25.1.92

Abstract

An eccrine poroma is a benign neoplasm that originates from the intraepidermal ductal portion of the eccrine sweat duct. Although eccrine poromas are most commonly found on the sole or side of the foot, eccrine poromas have been observed on other areas of the skin, such as the scalp, neck, and chest. We report an interesting case of an eccrine poroma, which presented as a 1x1 cm protruding dome-shaped, skin-colored-to-black nodule on the right postauricular area. The patient denied a previous history of trauma to this area. The histopathologic diagnosis was consistent with an eccrine poroma. There has been no local recurrence 5 months after complete excision.

Keyword

Ear; Poroma

MeSH Terms

Ear
Foot
Humans
Neck
Poroma
Recurrence
Scalp
Skin
Sweat
Thorax

Figure

• 

  Fig. 1 Asymptomatic, solitary, 1×1 cm, protruding, dome-shaped, glistening, skin-colored-to-black mass on the postauricular area.

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  Fig. 2 (A) The tumor consists of broad anastomosing bands extending from the epidermis to the dermis. (B) Small, irregular ductal lumina were found within the tumor. (C) A view at higher magnification revealed that the tumor cells are connected intercellular bridges and have a uniform small cuboidal appearance and a round, deeply basophilic nucleus (H&E stain; A: ×40, B: ×100, C: ×400).

Reference

1. Joshi RR, Nepal A, Ghimire A, Karki S. Eccrine poroma in neck of a child--a rare presentation. Nepal Med Coll J. 2009. 11:73–74.

2. Kim TJ, Ji HR, Chyung EJ, Park SY, Yang SK, Kim JT. Eccrine poroma: an unusual variant. Korean J Dermatol. 1983. 21:119–123.

3. Hyman AB, Brownstein MH. Eccrine poroma. An analysis of forty-five new cases. Dermatologica. 1969. 138:29–38.

4. Goldman P, Pinkus H, Rogin JR. Eccrine poroma; tumors exhibiting features of the epidermal sweat duct unit. AMA Arch Derm. 1956. 74:511–521.

5. Moore TO, Orman HL, Orman SK, Helm KF. Poromas of the head and neck. J Am Acad Dermatol. 2001. 44:48–52.