Localization of 99mTc-Methylene Diphosphonate in Skin Lesions of Pseudoxanthoma Elasticum

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Increased uptake of 99mTc-methylene diphosphonate (MDP) is demonstrated in a patient with pseudoxanthoma elasticum (PXE) at the affected site. PXE is a hereditary disease with variable expression. Calcification of dermal elastic fibers is a characteristic feature of affected skin. Recently, apatite crystals were identified in the affected skin of the patients with PXE. The mechanism of uptake of 99mTc-MDP is probably related to chemisorption of the tracer onto hydroxyapatite crystals in the affected dermis.

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