Mucinous Eccrine Nevus

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.