ἀνεύρυσμα

The ancient Greek aneurysma (ἀνεύρυσμα) derived from aneurynein — to dilate, widen, or open up — compounded from ana- (up, again) and eurynein (to widen), from eurys (wide, broad). In Greek medical writing the word described any pathological widening of a vessel: the arterial wall, weakened by disease or injury, balloons outward under the pressure of the pulse. Greek and Roman surgeons were aware of aneurysms as clinical entities; the Greek physician Antyllus in the 2nd century CE described both the pulsating tumor and a surgical technique for managing it — ligating the vessel above and below the bulge and opening the sac. This was not always successful, but it was an attempt at intervention.

Galen described aneurysms in his anatomical writings, and the word passed into Latin medical literature. Medieval Arabic physicians — working in a tradition that preserved Galenic anatomy through Ibn Sina and others — recognized aneurysm as a distinct pathological entity. The critical limitation of ancient and medieval aneurysm understanding was that physicians could only detect and treat those near the surface: aneurysms of the temporal artery, the popliteal artery behind the knee, the aorta when it had grown large enough to be felt through the abdominal wall. The deeper aneurysms — in the aorta before they grew palpable, in the cerebral arteries — were invisible until they ruptured.

The 17th and 18th centuries brought systematic anatomical study of aneurysms. The London surgeon John Hunter developed collateral circulation theory in the 1780s — showing that if an artery is ligated above an aneurysm, collateral vessels can maintain blood supply to the distal limb — and applied this to successful treatment of a popliteal aneurysm in 1785, a landmark in vascular surgery. The 19th century revealed the pathological mechanisms: aortic aneurysm from syphilitic aortitis, atherosclerotic aneurysm from arterial wall degeneration, the berry aneurysm of the cerebral circulation arising at arterial branch points. Each required a different understanding of how the arterial wall could widen to catastrophic rupture.

In the 20th century, surgery became capable of reaching the aorta and the cerebral circulation. The cardiac surgeon Michael DeBakey performed the first successful resection of an abdominal aortic aneurysm with graft replacement in 1952. Neurosurgeons developed the clip — a tiny metal clasp placed across the neck of a cerebral aneurysm to exclude it from the circulation — and in the 1990s, endovascular coiling (filling the aneurysm sac with wire coils through a catheter threaded from the groin) joined clipping as a treatment for brain aneurysms. CT angiography now allows detection of aneurysms before they rupture. The Greek widening-word has been the name of a race against rupture for twenty-five centuries.