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July 1965

Picture of the Month

Am J Dis Child. 1965;110(1):85-86. doi:10.1001/archpedi.1965.02090030091013

Denouement and Discussion 


MAJOR MANIFESTATIONS  Absence of the pectoralis major or, more frequently, of the sternal portion of this muscle with syndactyly on the same side.

GENETICS  Does not appear to be genetically determined (only one reported case which was hereditary).

SEXUAL INCIDENCE  Appears equally in both sexes.

PHYSICAL FINDINGS  The pectoralis major or its sternal head is missing, thereby causing the absence of the normal, well-developed anterior axillary fold. There may be a band of fibrous tissue present, forming a web over the anterior surface of the axilla which limits the abduction of the arm.There is syndactyly on the involved side. There may be associated congenital anomalies of the homolateral hemithorax such as rib and costal cartilage defects, absence of the ipsilateral nipple, and asymmetry of breasts. The extremity on the affected side is usually smaller than on the unaffected side, and there may be limitation of movement at elbow and

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