#Subclavian Aneurysm.#--Subclavian aneurysm is usually met with in men
who follow occupations involving constant use of the shoulder--for
example, dock-porters and coal-heavers. It is more common on the right
side.
The aneurysm usually springs from the third part of the artery, and
appears as a tense, rounded, pulsatile swelling just above the clavicle
and to the outer side of the sterno-mastoid muscle. It occasionally
extends towards the thorax, where it may become adherent to the pleura.
The radial pulse on the same side is small and delayed. Congestion and
oedema of the arm, with pain, numbness, and muscular weakness, may result
from pressure on the veins and nerves as they pass under the clavicle;
and pressure on the phrenic nerve may induce hiccough. The aneurysm is
of slow growth, and occasionally undergoes spontaneous cure.
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