Diagnosis: Congenital smooth muscle hamartoma. Congenital smooth muscle hamartomas (CSMH) are benign skin tumors seen at or shortly following birth, most commonly located on the trunk or proximal ...

Growths vary in size from 1 to 9 centimeters and consist of lobules of cartilage, fat, fibromyxoid tissue and, on occasion, smooth muscle and bone. The growth of these lesions is extremely slow ...