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Kardiochirurgia i Torakochirurgia Polska/Polish Journal of Thoracic and Cardiovascular Surgery
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4/2016
vol. 13
 
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Retroperitoneal tumor: giant cavernous hemangioma – case presentation and literature review

Jacek Zielinski
,
Ireneusz Haponiuk
,
Radoslaw Jaworski
,
Rafal Peksa
,
Ninela Irga-Jaworska
,
Janusz Jaskiewicz

Kardiochirurgia i Torakochirurgia Polska 2016; 13 (4): 375-379
Online publish date: 2016/12/30
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Introduction

Primary retroperitoneal tumors (PRTs) of vascular origin are a diverse group of rare abdominal neoplasms, both benign and malignant [1]. The most frequent malignant tumors are liposarcoma and leiomyosarcoma, while the most often found benign tumors are lipoma, leiomyoma and cavernous hemangioma [2–5]. Hemangiomas are a group of neoplasms originating from vascular tissue where benign tumors prevail. Among these capillary hemangioma, cavernous hemangioma, racemous hemangioma, angioleiomyoma and hemangiopericytoma are most frequent. Malignant hemangiomas are rare. Cavernous hemangiomas most frequently occur in the liver. Other described localizations are skin, muscles, bones, central nervous system and retroperitoneal organs (intestines, kidneys, adrenal glands, urinary bladder, uterus) [6–16].
An interventional staged therapy is becoming more popular with the aim of reducing the diameter of the main hemangioma, especially that surrounded with diffuse hemangiomatosis [17]. Successful combination of transcatheter arterial embolization (TAE) prior to the surgery of cavernous hemangioma of the liver was reported recently [18]. Nevertheless, the treatment of choice for primary retroperitoneal tumors is still radical surgical resection that leads to recovery. Surgical techniques used for treatment of PRTs are: open procedures, laparoscopy, surgical endoscopy and percutaneous radiofrequency ablation [8, 19].
The present case is a patient with giant retroperitoneal cavernous hemangioma originating from the ilium with atypical clinical course who was referred for surgical treatment.

Case report

A 71-year-old female patient was referred to the Department of Surgical Oncology with a giant retroperitoneal tumor located in the left iliac fossa. The patient discovered the abdominal tumor 15 years earlier, but as it did not cause any problems she refused to seek medical help. No symptoms from the intestinal or urinary tract were present. Several months prior to admission to the department the first symptoms appeared: left lower limb edema, exertional dyspnea, abdominal distension and anemia with pallor and lowered hemoglobin level. Physical examination revealed a large, skin modeling, nonpulsatile mass in the left iliac fossa (Fig. 1 A).
When abdominal contrast-enhanced computed tomography (CT) was performed, a tumor 20 × 17 × 18 cm in diameter lying on the iliac ala was found (Fig. 1 B). The tumor did not meet radiological criteria for vascular tumors. No lesions in the liver were found. Infiltration of retroperitoneal organs and structures could not be excluded. Chest X-ray did not reveal any abnormalities within the thorax. An ultrasonography-guided fine needle biopsy was performed, revealing blood cells with necrotic masses and connective tissue which prevented precise diagnosis. Blood laboratory findings were: anemia (Hb 8.8 g/dl), elevated white blood cell count (21.81 G/l) and high C-reactive protein level (100.8 mg/l).
Because of uncertainties regarding the histological type of the tumor, escalation of abdominal pain and left lower limb edema in recent weeks and the patient’s strong willingness to remove the tumor, the decision to perform laparotomy was made (Figs. 2 A, B).
During the surgery a large mass on the ala was found. There were no signs of infiltration of neighboring organs, and the sigmoid colon was tight on the tumor. After separating the sigmoid and identification of the left ureter and iliac vessels the tumor was removed. No other organs were hurt or resected. Massive damage to the internal surface of the ala was found in the place where the tumor grew. Hemostasis was performed and the surface marked with titan clips. The postoperative period was uncomplicated. The patient was discharged from the hospital on postoperative day 5.
Pathologic examination showed a tumor 20 × 19 × 16 cm in diameter, weighing 3000 g (Fig. 2 C). On 1/3 of its surface a peduncle connecting the tumor to the ala was found. The tumor had microscopic features of vascular neoplasm – cavernous hemangioma. Histochemically the cells lining the lacunae were stained positively by markers for CD34 (Figs. 3 A, B).
The postoperative follow-up is 3 years. Within this time limb edema and other symptoms gradually abated.

Discussion

Primary retroperitoneal tumors are usually diagnosed late, when the disease is advanced. This is caused by its initially symptomless course and therefore delayed presentation to a physician.
The most frequent symptoms of retroperitoneal tumors are non-specific abdominal pain (51.8%) and abdominal distension (18.7%). Less frequent symptoms include constipation (8%), fever (8%), dysuria (4.3%), lower limb edema (6.5%), weight loss and cachexia (5%) [2]. The time of these symptoms’ occurrence varies from several months for sarcomas to years for benign tumors. Patients usually visit a physician when they discover a pathological mass in the abdomen (60.4%) [1]. In the present case her first symptoms (abdominal distension and limb edema) occurred 15 years after discovering the tumor.
On CT images retroperitoneal tumors present as heterogeneous pathological masses with hypoechogenic areas corresponding to necrotic zones in the tumor [1]. The giant tumor mass causes displacement of adjacent organs. Usually their infiltration is hard to exclude. Similar manifestations occurred in the present case.
We considered an interventional staged therapy with TAE for its possible advantage of reduction of the diameter of the main tumor mass, and surrounding diffuse hemangiomatosis, which was reported in the case of cavernous hemangioma of the liver [18]. The age of the patient with possible diffuse arteriosclerosis and the necessity to resect the symptomatic tumor were the arguments to abandon the percutaneous option.
Radical resection remains the treatment of choice for cavernous hemangioma. However, one can find publications on treatment of hepatic cavernous hemangioma with percutaneous radiofrequency ablation [19]. In the present case the size and localization of the tumor and urgent necessity made the operation a high-risk procedure with possibility of resecting vital structures, such as the sigmoid colon or ureter.
In the present case the long-term history of abdominal tumor indicated a benign tumor, while radiological and clinical findings suggested malignant disease. The literature review shows that in differential diagnosis of giant abdominal tumors, rare benign neoplasms should be considered in every case. Radical surgical resection resulted in full recovery in our patient, which corresponds to commonly found conclusions despite the huge diameters and the origin of retroperitoneal tumors [20, 21].
In the literature reports we found only 15 cases of retroperitoneal cavernous hemangiomas in kidneys, adrenal glands, urinary bladder, uterus and the retroperitoneal part of the rectum [6–15]. However, no description of cavernous hemangioma of the ilium was found; therefore our report seems to be a unique contribution to contemporary knowledge (Tab. I).

Conclusions

Because of their initially symptomless course, primary retroperitoneal tumors are usually diagnosed in an advanced stage of the disease, which is the reason for many uncertainties regarding safe surgical resection. Radical surgical resection remains the treatment of choice for primary retroperitoneal cavernous hemangiomas, although the decision of performing such operations should be taken after thorough analysis of indications (escalation of symptoms) and contraindications (risk of damaging vital retroperitoneal organs with massive bleeding).

Acknowledgments

The authors thank Dr Pawel Kabata for his great support in preparation of this manuscript.

Disclosure

Authors report no conflict of interest.

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Copyright: © 2016 Polish Society of Cardiothoracic Surgeons (Polskie Towarzystwo KardioTorakochirurgów) and the editors of the Polish Journal of Cardio-Thoracic Surgery (Kardiochirurgia i Torakochirurgia Polska). This is an Open Access article distributed under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) License (http://creativecommons.org/licenses/by-nc-sa/4.0/), allowing third parties to copy and redistribute the material in any medium or format and to remix, transform, and build upon the material, provided the original work is properly cited and states its license.
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