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Arch Dermatol. 2005;141:897-902.

	Since this article does not have an abstract, we have provided the first 150 words of the full text and any section headings.

Diagnosis: Mucinous nevus (MN) (a connective tissue hamartoma).

MICROSCOPIC FINDINGS

Routine histologic examination demonstrated a normal epidermis. In the papillary and superficial reticular dermis, increased interstitial mucin and an increased number of fibroblasts and blood vessels were seen. Thickened collagen fibers were not noted. Colloidal iron staining confirmed the abundance of mucin, and a van Gieson stain showed a decreased density of elastic fibers in the affected areas.

DISCUSSION

Mucinous nevus is an uncommon connective tissue hamartoma that is characterized by increased deposition of dermal mucin in a nevoid or linear pattern. The term was first used by Redondo Bellón et al¹ to describe a brown, interscapular plaque of firm, coalescent papules that had been present in a 16-year-old girl since birth. Histopathologic examination showed an accumulation of mucin in the superficial dermis, without any other remarkable findings. Other cases of both congenital and later-onset MN have subsequently been reported.^2-6 An earlier report of "congenital mucinosis of infancy" presenting in a . . . [Full Text of this Article]

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Arch Dermatol. 2005;141(7):897-902.
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