The heart had only one cavity but all the other organs
were perfectly formed. This case seems to be unique. Tichomiroff
records the case of a woman of twenty-four who died of pneumonia
in whom the left lung was entirely missing. No traces of a left
bronchus existed. The subject was very poorly developed
physically. Tichomiroff finds four other cases in literature, in
all of which the left lung was absent. Theremin and Tyson record
cases of the absence of the left lung.
Supplementary pulmonary lobes are occasionally seen in man and
are taken by some authorities to be examples of retrogressive
anomalies tending to prove that the derivation of the human race
is from the quadrupeds which show analogous pulmonary
malformation. Eckley reports an instance of supernumerary lobe of
the right lung in close connection with the vena azygos major.
Collins mentions a similar case. Bonnet and Edwards speak of
instances of four lobes in the right lung. Testut and Marcondes
report a description of a lung with six lobes.
Anomalies of the Diaphragm.--Diemerbroeck is said to have
dissected a human subject in whom the diaphragm and mediastinum
were apparently missing, but such cases must be very rare,
although we frequently find marked deficiency of this organ.
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