Linear Eccrine Poroma

Eccrine poromas in a patient with mycosis fungoides treated with electron beam therapy.

“…Both MF and EP are relatively rare among all skin disorders. To the best of our knowledge, case reports about multiple EPs are extremely rare, 8–11 and furthermore, except for our present case, no report has been published about MF with multiple EPs. It is of great interest that there was a case report of multiple EPs arising in chronic radiation dermatitis, suggesting that X‐rays might in fact trigger the development of this appendage tumour 10 .…”

Multiple apocrine poromas: a new case report

“…The tumor on the patient's nostril which had previously been diagnosed as a basal cell carcinoma was probably an apocrine poroma with primitive follicular differentiation. Although separate cases of apocrine poromas and a few case reports of multiple eccrine poromas have been reported, to our knowledge, this is the first case report of multiple apocrine poromas. Other cases of multiple eccrine poromas were associated with immunosuppressive conditions because of total body irradiation .…”

Reactive epidermal eccrine proliferation on the foot due to lymphedema: Eccrine poroma or syringofibroadenoma?

“…Decades after its initial description, ESFA has been categorized to occur as five distinct clinical subtypes: (a) solitary ESFA, (b) multiple ESFAs associated with ectodermal dysplasia, including Clouston syndrome (hidrotic ectodermal dysplasia) and Schöpf‐Schulz‐Passarge syndrome, (c) multiple ESFAs without associated cutaneous findings, (d) nonfamilial linear (nevoid) ESFA, and (e) reactive ESFA associated with inflammatory or neoplastic dermatoses, including lichen planus, venous as well as diabetic foot ulcers, epidermolysis bullosa, lymphedema, and others . However, it is worth noting that single, multiple, reactive, and linear variants of eccrine poroma have also been described in the literature . Moreover, eccrine poromatosis has been described in a patient with Clouston syndrome (hidrotic ectodermal dysplasia) who is a member of the kindred originally described by Clouston .…”

“…Additionally, in a review of 25 cases of Schöpf‐Schulz‐Passarge syndrome, three of the patients had eccrine poromas . Some may argue that ESFAs differ histologically from eccrine poromas in that thin epithelial strands are associated with ESFA, while broad, anastomosing bands of epithelial cells are associated with eccrine poroma; however, this distinction seems inadequate as a justification for a separate classification, and moreover, some of the earliest reports of poroma in the literature include those that were described as having a “lace‐like pattern” of thin anastomosing strands of tumor cells indistinguishable from an ESFA …”