Case report : rupture of popliteal artery aneurysm

An 83-year-old female patient with a history of prior endovascular treatment to repair an abdominal aortic aneurysm presented with intense pain and edema in the left leg, with hyperemia and localized temperature increase. Doppler ultrasonography revealed a voluminous aneurysm of the popliteal artery with a contained rupture, and hematoma involving the popliteal fossa and the medial and anterior surfaces of the knee causing compression of the popliteal vein. Endovascular repair was accomplished with covered stents and the rupture was confirmed. during the procedure The aneurysm was excluded and the signs and symptoms it had caused resolved completely, but during the postoperative period the patient developed sepsis of pulmonary origin and died.


INTRODUCTION
Popliteal artery aneurysms (PAA) are responsible for 70 to 80% of cases of peripheral aneurysms.They have greatest incidence in men over 65 years of age and in 50% of cases they are bilateral. 1While etiology is multifactorial, the most common agent is atherosclerosis; clinical diagnosis only occurs when arterial dilation has attained large dimensions or when ischemic complications in the limb emerge. 2 Clinical manifestations of PAA include acute arterial thrombosis, distal embolization, compression of veins and/or nerves and rupture, the last of which is a rare complication. 1owadays, endovascular surgery has become established as an alternative treatment to open repair of PAA, since it offers certain advantages, such as reduced blood loss, more rapid postoperative recovery and earlier hospital discharge. 3,4We report a rare case of PAA rupture that was treated in the emergency room using endovascular techniques.

CASE DESCRIPTION
An 83-year-old female patient with prior history of endovascular repair of an abdominal aortic aneurysm was admitted 15 days after onset of significant pain and edema in the left lower limb.Physical examination revealed edema with pitting involving the left knee and leg, discrete hyperemia and localized temperature increase, in addition to a pulsating mass in the popliteal area (Figure 1).Doppler ultrasonography of the lower limbs revealed a voluminous aneurysm of the popliteal artery and hematoma involving the popliteal fossa and the medial and anterior surfaces of the knee, with images compatible with a contained rupture causing compression of the popliteal vein.The patient had presented at a different service with the rupture around a week previously and had been treated for erysipelas; she had a high surgical risk and considerable cardiac arrhythmia, in addition to anemia (her hemoglobin level was 10).Surgery was performed via anterograde puncture of the common femoral artery and the aneurysm was accessed using a hydrophilic guide wire and multi-purpose catheter; the proximal zone was assessed and two Gore Viabahn  covered stents were released and fitted with the aid of an angioplasty balloon.During the endovascular surgical procedure it was possible to observe that the aneurysm had ruptured and that after repair it was completely excluded (Figures 2 and 3).The patient required one bag of concentrated red blood cells during the procedure.The patient's signs and symptoms resolved completely after the procedure,   but during the postoperative period she developed sepsis of pulmonary origin and died.

DISCUSSION
Popliteal artery aneurysms are the most common type of peripheral aneurysm and they are the second most frequent out of all different types of aneurysms, with only abdominal aortic aneurysms occurring more often. 5][6] The presence of a PAA is suggestive of the existence of aneurysms in other territories, particularly the contralateral popliteal arteries, the femoral and iliac arteries and the abdominal aorta. 1,4,5,7][9] Patients may be asymptomatic or they may present with ischemic symptoms related to thrombosis of the aneurysm or an embolic event secondary to it, which can occur in 33% of cases. 7The manifestations of ischemia are the same that result from any type of ischemic event, including pallor, low-temperature, absent pulses paresthesia and pain.Symptoms of nerve compression, such as tingling and burning sensations, or of venous pressure, such as edema and deep venous thrombosis, can also occur. 5n general, AAPs are responsible for high complication rates, varying from 68 to 77% of cases over 5 years.Rupture of a PAA occurs in 0.5 to 7% of cases. 7,9,10p to 40 percent of patients can require lower limb amputation and life-threatening events occur in 5% of cases. 7reatment consists of excluding the aneurysm in cases where diameter is greater than 2 cm, there is mural thrombus or torsion exceeds 45 o .Bilateral cases and patients with concomitant arterial hypertension should also be treated because of the higher rates of complications. 7,11,12his report describes the case of a woman with a ruptured popliteal artery aneurysm who was successfully treated using endovascular techniques to place covered stents.The emergence of endovascular surgery as a treatment option is transforming care because it offers less perioperative blood loss and shorter hospital stays and recovery times, when compared with conventional open treatment.

Figure 1 .
Figure 1.Preoperative presentation.Image of medial surface of the thigh, showing voluminous hematoma and ecchymosis of subcutaneous tissues.

Figure 2 .
Figure 2. Intraoperative image showing aneurysm rupture, with contrast leakage, and its containment.