Combined blue nevus-smooth muscle hamartoma: a series of 12 cases

Authors


Shane A. Meehan, MD,

Dermatopathology Section, NYU Langone Medical Center, 530 First Avenue, Suite 7J, New York, NY, USA

Tel: +212 263 7250

Fax: +212 684 2991

e-mail: Shane.Meehan@nyumc.org

Abstract

Background

One of the most common types of combined melanocytic nevus is that of a blue nevus with ordinary melanocytic nevus. Blue nevi have also been described in association with non-melanocytic cell types, such as those of neural or mesenchymal derivation. Although there are rare descriptions in the literature of blue nevi with myomatous structures, the specific association of combined blue nevi with smooth muscle hyperplasia has not been reported

Methods

We review the clinicopathological features of 12 cases of combined blue nevi with smooth muscle hyperplasia.

Results

The majority of these lesions occurred on the back of middle-aged patients and were clinically interpreted as melanocytic nevi or melanoma. Histopathologic examination revealed a combined population of ‘common’ and blue nevus melanocytes with accompanying smooth muscle hyperplasia. In addition to a lentiginous proliferation of melanocytes at the dermal-epidermal junction with variable basilar hyperpigmentation, there were varying degrees of epidermal acanthosis and follicular induction (three cases).

Conclusion

We present an unusual hamartoma with features of combined blue nevus and smooth muscle hyperplasia, which has not been previously described.

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