Pseudoxanthoma elasticum-like papillary dermal elastolysis

Pseudoxanthoma elasticum-like papillary dermal elastolysis (PXE-like papillary dermal elastolysis), also known as papillary dermal elastolysis or fibroelastolytic papulosis, is a rare acquired skin disorder that primarily affects elderly women. It is characterized by the appearance of small, yellowish-white, non-follicular papules that may coalesce into cobblestone-like plaques, typically distributed on the neck, axillae, and other flexural areas. The clinical appearance closely mimics pseudoxanthoma elasticum (PXE), but the two conditions are distinct. Unlike PXE, this disorder does not involve systemic complications such as ocular angioid streaks or cardiovascular calcification. Histologically, the condition is defined by a selective loss or fragmentation of elastic fibers in the papillary dermis, without the calcification of elastic fibers that is characteristic of true PXE. The mid and deep dermal elastic fibers are typically preserved. The pathogenesis remains poorly understood, and no specific genetic mutation has been identified; the condition is considered acquired and sporadic rather than inherited. There is no established curative treatment for PXE-like papillary dermal elastolysis. The condition is generally benign and primarily of cosmetic concern. Management is largely supportive and may include reassurance and differentiation from true PXE to avoid unnecessary systemic investigations. The prognosis is favorable as the disease does not progress to involve other organ systems. Due to its rarity, awareness among clinicians is important to prevent misdiagnosis as PXE or other elastolytic conditions.

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