M. K., white, born Feb. 19, 1924, was the first child of healthy parents and a full term baby. Delivery was a face presentation and the membranes ruptured thirty-six hours before. Forceps and strong traction were required to effect a delivery, the mother being under ether anesthesia for two and a half hours. The abnormal position of the upper extremities was noticed immediately after delivery. The mother first noticed it on the fifth day when the baby held the arms abducted, the elbows flexed, the wrists dropped and deviated ulnarward, and all fingers flexed. The bases of the thumbs touched the acromion processes. This position was maintained continuously except during sleep when the hands were under the chin.
—On April 28 the child, then nearly ten weeks old, was seen by Dr. Lewis J. Pollock, who reported normal findings except for the arms, as follows:
Philip Lewin, Harry Arkin. A CASE OF UNUSUAL BRACHIAL PLEXUS PALSY. Arch NeurPsych. 1926;16(1):75–77. doi:10.1001/archneurpsyc.1926.02200250078009