Congenital Smooth Muscle Hamartoma Characterized by Hypopigmented Appearance
- Author:
Jongwook KIM
1
;
Giwook LEE
;
Jun-Oh SHIN
;
Dong Young ROH
;
Yeona KIM
;
Sang-Hyeon WON
;
Jungsoo LEE
;
Kihyuk SHIN
;
Hoonsoo KIM
;
Hyun-Chang KO
;
Byung Soo KIM
;
Moon-Bum KIM
Author Information
1. Department of Dermatology, Pusan National University School of Medicine, Busan, Korea
- Publication Type:Case Report
- From:Korean Journal of Dermatology
2024;62(3):165-168
- CountryRepublic of Korea
- Language:EN
-
Abstract:
Congenital smooth muscle hamartoma is a benign proliferation of smooth muscles within the dermis. The classic form presents as well-defined, skin-colored, or hyperpigmented plaques associated with hypertrichosis. However, there have been reports of atypical forms, including a follicular spotted appearance, linear atrophic plaques, and morphea-like forms. In such cases, distinguishing congenital smooth muscle hamartomas from other cutaneous diseases can be challenging. Herein, we report on a 16-month-old boy who presented with a hypopigmented patch and hypertrichosis on his back since birth. Histopathological examination revealed mild acanthosis and well-defined smooth muscle bundles haphazardly oriented in the dermis. These bundles stained positively with Masson’s trichrome stain. Based on these findings, a definitive diagnosis of congenital smooth muscle hamartoma was established. In conclusion, an exceptionally rare case of congenital smooth muscle hamartoma with a hypopigmented appearance is reported.
