Letter: Absence of pectoralis major muscle in two sisters associated with leukemia in one of them.
D002536:Cerebral Arteries / Q000002:abnormalities; D002675:Child, Preschool; D004200:Diseases in Twins; D005260:Female; D006801:Humans; D007223:Infant; D007945:Leukemia, Lymphoid / Q000150:complications*; D010369:Pectoralis Muscles / Q000002:abnormalities*