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D. F., a youth, aged 19, is husky and muscular except for the absence of the left pectoralis major and minor muscles. In their location the ribs are plainly evident on inspection up to the clavicle. The infraclavicular region is a well marked fossa covered with loose skin. The right pectoral region is very rotund and muscular. The left mammary region seems atrophied and much smaller than the right. There is a history of suppurative infection of the left mammary gland a few days after birth. This was diagnosed "witches' milk" (whatever that is) by the attending physicians at the time of birth, and the chest deformity was attributed to it. There are no scars and no history of the breast being opened.
Heyde JM. ABSENCE OF LEFT PECTORALIS MAJOR AND MINOR MUSCLES. JAMA. 1924;83(2):121. doi:10.1001/jama.1924.26610020002018