Pigmented eccrine poroma: report of an atypical case with the use of dermoscopy

Abstract

Poromas are uncommon benign neoplasms originating from the terminal ductal portion of the sweat glands, mainly characterized by skin-colored or pink pa pules or nodules, usually on the extremities. Due to their rarity, the pigmented form clinical hypothesis is hardly ever suggested and psychopathology is fundamental. We report a case of pigmented eccrine poroma in the right palmer area, a location considered atypical. We stress the importance of dermoscopy as a method for diagnosis of poromas, especially in the differential diagnosis with other pigmented nodular-popular lesions.

Dermoscopic features and patterns of poromas: a multicentre observational case–control study conducted by the International Dermoscopy Society

“…Lesion morphology (macule, papule, plaque, nodule, tumour), number of colours and maximum diameter (in millimetres) were recorded. A comprehensive list of dermoscopic structures reported to be present in poromas was created (Data , Supporting Information) . After careful appraisal of previous descriptions and consensus amongst the reviewers, cherry‐blossom vessels, flower‐like vessels, floral vessels, chalice‐like vessels and leaf‐like vessels were categorized as structure called branched vessels with rounded endings, defined as branched vessels with looped or coiled terminal endings that characteristically have a rounded silhouette.…”

“…A comprehensive list of dermoscopic structures reported to be present in poromas was created (Data S1, Supporting Information). [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] After careful appraisal of previous descriptions and consensus amongst the reviewers, cherry-blossom vessels, flower-like vessels, floral vessels, chalice-like vessels and leaf-like vessels were categorized as structure called branched vessels with rounded endings, defined as branched vessels with looped or coiled terminal endings that characteristically have a rounded silhouette. We considered milky-red areas, pink-white structureless areas, pink homogeneous area and creamy red background as one feature called milky-red areas, defined as structureless areas with pink to white-red areas.…”

Acquired digital fibrokeratoma: review of its clinical and dermoscopic features and differential diagnosis

“…It shares clinical resemblance with ADFK and presents as a skin‐colored or pink papule, plaque, or nodule, but exophytic or ulcerated nodules and hyperkeratotic plaques are also described . Histological examination may show proliferation of uniform cuboid cells with light‐colored cytoplasm and evident intercellular bridges that are not seen in ADFK . The pigmented variant, also known as pigmented eccrine poroma, often occurs in nonacral regions and contains melanin pigments on histology …”

“…40 Histological examination may show proliferation of uniform cuboid cells with light-colored cytoplasm and evident intercellular bridges that are not seen in ADFK. 40 The with nerve fibers, wavy collagenous strands, and myxoid matrix is seen on histology. 5,44 In neurofibromatosis type 1, these tumors are typically present in multiples, and malignant transformation to neurofibrosarcoma can occur.…”

Eccrine poroma and porocarcinoma on the same unusual location: report on two cases

“…There is a malignant variant, eccrine porocarcinoma (EPC), which may be a primary tumor, but generally results from the malignant transformation of EP. 1 Both commonly occur in the palms or sides of the feet; these areas have a high concentration of eccrine sweat glands. We describe two respective cases of EP and EPC on the scrotum, which entailed good excisional results.…”