Eccrine poroma on the forearm in a child: A rare presentation
1Department of Dermatology, Mohammed V University in Rabat, Ibn Sina University Hospital, Rabat. Morocco, 2Department of Histopathology, Mohammed V University in Rabat, Ibn Sina University Hospital, Rabat. Morocco
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Eccrine poroma (EP) is a benign adnexal tumor arising from the terminal duct of the sweat gland. It represents 10% of all sweat gland tumors and is most commonly found on the sole or the side of the foot . Herein, we report a case of EP on the right forearm in a child.
A thirteen-year-old female with no past medical history presented with an asymptomatic nodule on the right forearm (Fig. 1). The nodule had gradually increased in size and was not associated with pain, pruritus, or bleeding from the lesion. A physical examination revealed a firm, mobile flesh-colored nodule on the right forearm 7 × 6 mm in size. A dermoscopic examination revealed chalice-like vessels, whitish-pink areas, and yellow structureless areas (Fig. 2). The nodule was completely excised and histopathological findings showed a tumor proliferation connecting to the epidermis, organized on thick, cellular cords and composed of small, cohesive, round cells forming homogeneous layers. These cellular cords were separated by fibrous interstitial tissue, not especially inflammatory, and traversed by regularly distributed capillaries (Figs. 3 and 4). Based on these histological findings, a diagnosis of EP was reached.
Although the pathogenesis of EP is unknown, it has been associated with trauma, scarring, and X-ray radiation . EP occurs in middle-aged individuals, with only around ten cases reported in children. EP typically presents as a solitary, asymptomatic papule, nodule, or plaque gradually enlarging, with colors varying from flesh-colored to red, and brown, and bluish. The palm and sole are the most common localizations of this tumor. The main dermoscopic features are vascular structures, a white-to-pink halo surrounding vessels, pink-white structureless areas, and yellow structureless areas . Pigmented EP may resemble basal cell carcinoma clinically and dermoscopically. Routinely, the diagnosis is reached by histopathology. Surgical excision is the treatment of choice. EP does not recur after excision. Malignant transformation rarely occurs .
The examination of the patient was conducted according to the principles of the Declaration of Helsinki.
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