Smooth muscle hamartoma (SMH) is an organoid malformation characterized by a painless hyperpigmented plaque with local hypertrichosis that is generally found on the trunk or proximal limbs, with lesions ranging from 2 to 10 cm in diameter. Histological examination reveals an increased density of smooth muscle bundles in the dermis and subcutis. Herein, we describe a Japanese patient with acquired SMH with Meyerson phenomenon. Histologically, a lymphoeosinophilic infiltrate in the dermis coexisted with the features of SMH.
Matsuda M, Hamada T, Ishii N, et al. Acquired Smooth Muscle Hamartoma of the Patchy Follicular Variant With Meyerson Phenomenon. Arch Dermatol. 2011;147(10):1234–1235. doi:10.1001/archdermatol.2011.294
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