That "post hoc non propter hoc" is sometimes a worthy maxim seems well exemplified by the misadventures of the two patients whose histories follow. Because of medicolegal possibilities both are of considerable interest.
H. R., a white man, aged 61, was referred by Dr. W. Mallory for treatment with arsphenamine in the hope that it would alleviate the great pain associated with an aneurysm of the transverse arch. Exactly twelve hours before the time appointed for the injection, the aneurysm ruptured. No antecedent treatment of any kind had been given.
As though to keep the law of averages, the following events occurred a month or two later:
Miss H., aged 41, had been a patient on and off for ten years. On June 6, 1929, she again came to the office because of a neurodermitis about 1 inch (2.5 cm.) in diameter, situated on the back of the scalp 1
HAZEN HH. COINCIDENCES IN MEDICINE. Arch Derm Syphilol. 1930;22(2):305–306. doi:10.1001/archderm.1930.01440140107011
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