Features Of Eccrine Poroma Research Articles

Dermoscopic Features of Eccrine Poroma

Eccrine poroma is a benign adnexal neoplasm that clinically may mimic malignant skin tumors such as squamous cell carcinoma and amelanotic melanoma. The dermoscopic features of pigmented and nonpigmented eccrine poroma have recently been described. We present 2 cases of eccrine poroma, with their dermoscopic features. The lesions were characterized by multiple red lacunes and a polymorphous vascular pattern in both cases. Dermoscopy can improve the clinical diagnosis of this benign adnexal skin tumor.

Eccrine Poroma: One Tumor, Many Faces

Pinkus initially described eccrine poroma as a benign neoplasm of the acrosyringium. The tumor, often consisting of broad anastamosing bands, arises from the epidermis and extends downward into the dermis. However, it may be completely intraepidermal (“hidroacanthoma simplex”), and, at times, appear to be completely dermal (“dermal duct tumor”). The characteristic tumor cell is squamoid, but smaller than the epidermal squamous cell. The cell has a cuboidal appearance with a uniform basophilic nucleus, and intercellular bridges. One can usually observe a sharp line of demarcation between the adjacent epidermis and the tumor cells. The histological sections presented are offered as evidence of the eclectic nature of eccrine poroma. The examples to be discussed include: the intraepidermal variant, the intraepidermal variant with “microcysts, the intraepidermal variant with “macrocysts” the epidermal/classic variant, the dermal variant, the pigmented variant, the irritated variant, the chondroid variant, the syringomatous variant and the focally malignant variant. Each example has the classic features of eccrine poroma and an outstanding individual characteristic. But, all are eccrine poromas. These specimens are from the Medical College of Virginia/Francis H. McMullan collection, representing fifty years of practice, teaching and service.

A Single Lesion Demonstrating Features of Eccrine Poroma and Poroid Hidradenoma

A case of a single poroma lesion with the features of eccrine poroma and poroid hidradenoma is reported. The patient was a 61-year-old woman with a soft nodule, light brown in color, located on the posterior aspect of the right knee and containing a pigmented papular lesion in its center. The histological features of the papular lesion and the nodule were consistent with those of eccrine poroma and poroid hidradenoma, respectively. The eccrine poroma portion consisted mostly of poroid cells. The number of cuticular cells was slightly greater than that of poroid cells in the poroid hidradenoma portion. The cuticular cells in this portion as well as the poroid cells in both portions were immunohistochemically positive for epithelial membrane antigen. The findings in this case suggest that there is a close relationship between eccrine poroma and poroid hidradenoma and support the view that poroid hidradenoma is a type of poroma.

Eccrine Poroma on the Scalp: A Case Report with MR Findings

Eccrine poroma is a benign neoplasm thought to originate from the eccrine sweat glands. The majority of eccrine poroma occur on the hairless acral surface, and cases of eccrine poroma on the scalp are rare. Moreover, all these case reports describe only the histopathological, not radiological, features of eccrine poroma. Here, we first report the magnetic resonance (MR) findings in a rare case of scalp eccrine poroma.