Mucinous eccrine nevus: an unusual lesion in a child

Mucinous Eccrine Nevus

A 46-year-old man with an erythematous, tender, swollen patch on the dorsum of his left fourth toe visited us. The biopsied tissue showed a proliferation of normally structured eccrine glands and ducts surrounded with abundant materials confirmed as mucin by toluidine blue stain. Mucinous eccrine nevus is an extremely rare entity, and only two cases have been reported in the literature. We describe a case of mucinous eccrine nevus which was late in onset and presented as a swollen patch.

Mucinous eccrine naevus: case report and review of the literature

Mucinous eccrine naevus (MEN) is an extremely rare variant of eccrine naevus. There are only nine reported cases in the English literature. We report a 3-month-old boy with a congenital lesion on the lower back, and review the other cases in the literature. In most cases, MEN presents before puberty. The commonest presentation is a unilateral, solitary, brownish nodule without hyperhidrosis occurring on the legs. The diagnosis of this condition is confirmed by the characteristic histopathological features. Treatment options may be considered if symptomatic.

A unique presentation of eccrine hamartoma: eccrine nevus with abnormal eccrine structures and angiomyxoid stroma

Eccrine hamartomas are very rare lesions usually presenting in early childhood, with variable clinical presentations. Local hyperhidrosis is often noticed. These lesions are all characterized by an increase in number and/or size of normal eccrine glands. We report the case of a hamartomatous lesion composed of eccrine structures and prominent angiomyxoid stroma, diagnosed in a 9-year-old girl. In this lesion, eccrine structures were not normal eccrine coils or ducts but ramified strands of small eosinophilic cells, containing a few eccrine ducts. These epithelial structures expressed carcinoembryonic antigen, cytokeratin 14, and cytokeratin 77, in a pattern suggesting ductal eccrine differentiation. The mesenchymatous component contained numerous capillary vessels in an abundant myxoid stroma. It was organized concentrically around the epithelial structures. This angiomyxoid stroma was somewhat reminiscent of mucinous eccrine nevi and eccrine angiomatous hamartomas. We propose to describe this unique lesion inside the group of eccrine nevi with the term "angiomyxoid eccrine nevus."

Congenital mucinous eccrine nevus in a 5-month-old girl with frequent intertriginous dermatitis

We present a 5-month-old girl with one localized plaque in a bandlike distribution on the left wrist since birth. Localized hyperhidrosis was also noted. Histopathologic examination of the lesion showed typical findings of mucinous eccrine nevus. Our report may serve to alert dermatologists to consider this entity in congenital lesions.

Mucinous hidradenoma: a report of three cases

Mucinous cutaneous adnexal tumors are an uncommon occurrence. We describe three cases of mucinous hidradenoma characterized by diffuse and prominent mucinous cell proliferation and discuss the relevant literature. The patients (two men and one woman) ranged in age from 32 to 72 years. The lesions were completely excised, and all patients were alive without evidence of disease (follow-up interval 3-4 years). Case 1 presented as a 1.3-cm eyelid nodule and histology showed a mucinous apocrine hidradenoma with a proliferation of mucinous cells and apocrine glands. Case 2, from the shoulder of a 40-year-old man, was a 2.5-cm well-circumscribed nodule composed of hyperplastic villoglandular proliferation of mucinous cells with focal squamous whorls and focal columnar glandular cells showing decapitation secretion. The tumor was also interpretated as a mucinous hidradenoma, most likely of follicular-apocrine origin. Case 3 was a 3.0-cm scalp nodule. The histology showed a mucinous clear-cell hidradenoma composed of numerous mucinous glands amidst small squamous cells with clear cytoplasm and a hyalinized fibrovascular stroma.

Eccrine mucinous metaplasia associated with an apocrine cystadenoma

Mucinous metaplasia occurs uncommonly in cutaneous pathology, usually at specialized anatomic locations (genitalia, palms, and soles) and within restricted pathologic contexts (inflammation and trauma). Here, we report a unique case of eccrine mucinous metaplasia associated with an apocrine cystadenoma. A 13-year-old girl had an asymptomatic, 4-mm nodule on the chest. Histopathology demonstrated a typical apocrine cystadenoma in the upper and middle dermis. Adjacent to this lesion was a cluster of coiled eccrine secretory glands, of which the inner layer was almost entirely replaced by benign-appearing cells containing abundant, non-sulfated acid mucopolysaccharides. At 10 months' follow up, there was no recurrence. Our case demonstrates that, very uncommonly, mucinous metaplasia may be associated with a pathogenetically separate, adjacent proliferative adenomatous lesion, in this instance, an apocrine cystadenoma.