[P106] A case of linear atrophic smooth muscle hamartoma = [P106] A case of linear atrophic smooth muscle hamartoma

다국어 초록 (Multilingual Abstract)

Smooth muscle hamartoma is a benign proliferation of mature smooth muscle. It is usually found on the trunk or extremity, and it can manifests as several forms: a single patch or plaque that can be accompanied with follicular prominence, or grouped solitary lesions (rarely with a linear distribution). The lesions can exhibit variable hyperpigmentation and hypertrichosis. A 50-year-old woman presented with linear brownish atrophic patches on her scalp for 1 week. The lesion did not cause any discomfort to the patient. No hypertrichosis or follicular prominence were noted. The clinical appearance suggested a diagnosis of linear morphea. An incisional biopsy showed a marked increase of well-defined bundles of smooth muscle fibers scattered throughout the dermis and basal layer hyperpigmention. Based on these findings, a diagnosis of smooth muscle hamartoma was made. Herein, we report a rare case of smooth muscle hamartoma that showed linear, atrophic features resembling a linear morphea.