Table of Contents Author Guidelines Submit a Manuscript
Case Reports in Radiology
Volume 2018 (2018), Article ID 4694931, 5 pages
Case Report

Endovascular Embolization of Spontaneous Iliopsoas Hematoma: First Experience with Squidperi

1ASST Santi Paolo and Carlo, San Carlo Borromeo Hospital, Department of Diagnostic Science, Radiology and Interventional Radiology Unit, Via Pio II 3, 20153 Milano, Italy
2Department of Diagnostic Imaging, Interventional Radiology Unit, Galliera Hospital, Mura delle Cappuccine 14, 16128 Genova, Italy
3Postgraduation School in Radiodiagnostics, Università degli Studi di Milano, Via Festa del Perdono 7, 20122 Milano, Italy

Correspondence should be addressed to Silvia Squarza

Received 15 September 2017; Revised 17 January 2018; Accepted 1 February 2018; Published 27 February 2018

Academic Editor: Roberto Iezzi

Copyright © 2018 Pierluca Torcia et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


A 79-year-old man, suffering from atrial fibrillation and on anticoagulation therapy, was admitted at the emergency department of our institution because of a worsening respiratory insufficiency. After a diagnostic work-up, he was found to suffer from pneumonia, and antibiotic therapy was settled. He was kept under observation for his pulmonary conditions but, within a week, he developed a spontaneous iliopsoas hematoma, due to a sudden dysregulation of anticoagulation therapy subsequent to new in-hospital treatments. An endovascular approach was attempted and the bleeding vessels were embolized with a new liquid agent, named Squidperi (Emboflu, Switzerland). Complete exclusion of the diseased vessels was obtained and no complications occurred after the procedure. We conclude that Squidperi can be considered as an option for treatment of spontaneous iliopsoas hematomas.

1. Introduction

The incidence of spontaneous iliopsoas hematoma is 0.1% in general population and 0.6% in elderly patients receiving anticoagulant therapies or affected by coagulopathies [1].

As typically it is not considered a life threatening condition, a nonoperative approach should be attempted at first. In fact, a correction of the International Normalized Ratio (INR) can be sufficient to let the bleeding stop. More radical handling (i.e., endovascular or surgical therapies) should be taken into consideration when dealing with continuous and/or consistent bleeding, leading to hemodynamic instability [2].

At present, when an invasive treatment is needed, percutaneous management by selective embolization of the bleeding vessels is considered as gold standard [3].

Herein, we describe a case of spontaneous iliopsoas hematoma treated with Squidperi (Emboflu, Switzerland), a new formulation available for embolization procedures.

2. Case Report

A 79-year-old man was admitted at the emergency department of our institution because of a worsening respiratory insufficiency. After a first evaluation he was found to suffer from lobar right pneumonia, so he was hospitalized to receive proper antibiotic treatment and supportive medical care. At the time of admission, he was on oral anticoagulation therapy because of a persistent atrial fibrillation. After a week of treatment, his haemoglobin (Hb) level decreased by 1.5 g/dl (having 10 g/dl at admission). He did not report other symptoms and his blood tests were otherwise consistent with the previous ones obtained during hospitalization. Because of his pulmonary condition, a bronchial artery haemorrhage was suspected, so he underwent urgent Multidetector Computed Tomography (MD-CT).

A thoracic-abdominal CT with triphase technique was performed and it demonstrated a left iliopsoas hematoma with three active points of contrast extravasation (Figures 1(a)1(c)). No active bleeding was detected at pulmonary level.

Figure 1

After multidisciplinary agreement, the patient underwent urgent Digital Subtraction Angiography (DSA) that confirmed the three points of bleeding described on CT, that is, gluteal artery, iliolumbar artery, and lumbar arteries (Figures 2(a) and 2(b)). DSA also demonstrated a site of active bleeding from circumflex iliac artery (Figure 3(a)). A coaxial superselective catheterization was performed for all these arteries with a Terumo Progreat microcatheter 2.7-Fr (Terumo, Tokyo, Japan) and then all the bleeding spots were embolized using the liquid embolic agent Squidperi 18 (Figures 3(a) and 3(b)). The final DSA control confirmed the complete embolization of all the diseased vessels and absence of active residual bleeding (Figure 4). The postoperative course was uneventful. Patient was discharged 3 days later, after completion of medical therapy for his pneumonia.

Figure 2
Figure 3
Figure 4: Final angiographic control demonstrates the complete exclusion of hematoma.

3. Discussion

Spontaneous iliopsoas hematoma is commonly found in elderly patients on anticoagulant therapies. As perfect compliance to anticoagulation treatments is not easy to obtain, patients’ INR can be easily found over the therapeutic range for a number of reasons, and this is the main risk factor for spontaneous bleeding [2]. Likewise, several treatments can react with the anticoagulation drugs, leading to a sudden alteration of INR, like in the case presented.

Anyhow, spontaneous retroperitoneal bleeding is rare and detection can be difficult. In a typical setting, patients may report acute low back pain, but it can be underestimated (both by the patient and the clinician) and referred to spinal neuromuscular problems. However, when the pain is associated with decreasing Hb values and peripheral neurologic symptoms (due to compression by the increasing hematoma), the clinician should suspect a retroperitoneal bleeding [2].

A triphase multislice CT angiography is considered the gold standard for diagnosis, as it allows detection of site and extension of hematoma as well as the evidence of active bleeding presenting as a blush of contrast media in arterial CT phase, that is, an indication for immediate treatment [4].

As stated, different approaches can be proposed when dealing with an iliopsoas hematoma and, at present, there is no general agreement about the best treatment options [3]. In our clinical practice, when a patient is found with a retroperitoneal hematoma but without signs of active bleeding or hemodynamic instability, a medical treatment is firstly proposed. Conversely, in case of blood loss and active arterial bleeding detected by CT scan, endovascular treatment is the first choice. Venous bleeding presents no indications to be treated with endovascular approach and, in case of patient’s clinical instability, surgical approach is the only choice of treatment.

Angiography has multiple advantages in this cases as, thanks to high resolution images and to injection of intra-arterial contrast media, it allows confirming the diagnosis obtained with CT scan and searching for other bleeding points that can be missed with other diagnostic modalities. This particular role was demonstrated also in our case. Moreover, once the bleeding vessels are detected, they can be selectively embolized, saving surrounding tissue [5].

Because all of these reasons, surgery should be proposed only after endovascular failure, or when other surgical conditions occur or in case of significant compressive neurological symptoms [6].

After treatment, CT angiography has to be repeated after treatment only in case of unexpected clinical or hemodynamical instability to evaluate the presence of new bleeding; it can also play a role in recognizing complications such as pseudoaneurysms during the follow-up.

To our knowledge, there are no previous reports regarding the embolization of a spontaneous iliopsoas hematoma with Squidperi. It is a nonadhesive liquid embolic agent made with EVOH (ethylene vinyl alcohol) copolymer dissolved in DMSO (dimethylsulfoxide), and suspended in a micronized tantalum powder. First experiences were reported by Akmangit et al. who extensively used Squidperi to treat arteriovenous malformations, arteriovenous fistula, aneurysms, and tumors [7]. Shortly after, Erbahceci Salik et al. reported the use of Squidperi to embolize a pelvic arteriovenous malformation [8]. Recently our group described the successful use of Squid for the management of a spontaneous rectus sheat hematoma [9].

Two forms of the agent are available, with decreasing viscosity: Squidperi 12 and Squidperi 18.

The biggest advantages in using the Squidperi are the high homogeneity of suspension and its stability over time, which allows an easily controlled and prolonged injection. Squidperi presents also a homogenic radiopacity that improves the assessment of vascular architecture

The main limitation of Squidperi is the time needed to prepare the formulation (about 15–20 minutes), mainly in emergency cases. However, if the preparation starts before the superselective cannulation of the bleeding vessels, it can be efficiently delivered without losing precious time.

In conclusion, due to the good intraprocedural result obtained with this embolic agent, it can be considered for treatment of spontaneous iliopsoas hematomas, although further studies are needed to state the outcome of patients on long-term basis.

Conflicts of Interest

The authors declare that there are no conflicts of interest regarding the publication of this paper.


  1. X. Estivill Pallejà, P. Domingo, J. Fontcuberta, and J. Félez, “Spontaneous retroperitoneal hemorrhage during oral anticoagulant therapy,” JAMA Internal Medicine, vol. 145, no. 8, pp. 1531–1534, 1985. View at Publisher · View at Google Scholar · View at Scopus
  2. J. Tsai, P. Yang, H. Lin, and C. Chang, “Spontaneous Iliopsoas Hematoma,” The Journal of Emergency Medicine, vol. 51, no. 3, pp. e53–e54, 2016. View at Publisher · View at Google Scholar
  3. Y. C. Chan, J. P. Morales, J. F. Reidy, and P. R. Taylor, “Management of spontaneous and iatrogenic retroperitoneal haemorrhage: conservative management, endovascular intervention or open surgery?” International Journal of Clinical Practice, vol. 62, no. 10, pp. 1604–1613, 2008. View at Publisher · View at Google Scholar · View at Scopus
  4. M. Scialpi, M. Scaglione, G. Angelelli et al., “Emergencies in the retroperitoneum: Assessment of spread of disease by helical CT,” European Journal of Radiology, vol. 50, no. 1, pp. 74–83, 2004. View at Publisher · View at Google Scholar · View at Scopus
  5. J.-M. Isokangas and J. M. Perälä, “Endovascular embolization of spontaneous retroperitoneal hemorrhage secondary to anticoagulant treatment,” CardioVascular and Interventional Radiology, vol. 27, no. 6, pp. 607–611, 2004. View at Publisher · View at Google Scholar · View at Scopus
  6. K. L. Sunga, M. F. Bellolio, R. M. Gilmore, and D. Cabrera, “Spontaneous retroperitoneal hematoma: Etiology, characteristics, management, and outcome,” The Journal of Emergency Medicine, vol. 43, no. 2, pp. e157–e161, 2012. View at Publisher · View at Google Scholar · View at Scopus
  7. I. Akmangit, E. Daglioglu, T. Kaya et al., “Preliminary experience with Squid: A new liquid embolizing agent for AVM, AV fistulas and tumors,” Turkish Neurosurgery, vol. 24, no. 4, pp. 565–570, 2014. View at Publisher · View at Google Scholar · View at Scopus
  8. A. Erbahceci Salik, F. Islim, A. Akgul, and B. E. Cil, “Concomitant transarterial and transvenous embolization of a pelvic arteriovenous malformation using a new liquid embolic agent, squid-12 and detachable coils,” Case Reports in Vascular Medicine, vol. 2014, Article ID 972870, 5 pages, 2014. View at Publisher · View at Google Scholar
  9. P. Torcia, U. G. Rossi, S. Squarza, and M. Cariati, “Spontaneous Hematoma of the Rectus Sheath: Urgent Embolization with Squidperi Liquid Embolic Device,” Case Reports in Radiology, vol. 2017, pp. 1–3, 2017. View at Publisher · View at Google Scholar