Adult Kasabach-Merritt Syndrome due to Hepatic Giant Hemangioma.

Cavernous hemangiomas are the most common benign tumors of the liver. They can reach enormous sizes and cause various complications. Kasabach-Merritt syndrome is a rare but serious complication characterized by consumptive coagulopathy caused by the hemangioma; mortality rate ranges between 10 and 37%. More than 80% of cases occur within the first year of life. Goals of the treatment are to control the coagulopathyand thrombocytopenia as well as to eradicate the hemangioma. Different nonsurgical treatment regimens are performed, includingsystemic corticosteroids, irradiation and various chemicals. Surgery should be limited to symptomatic or complicated cases. Although difficult, resection of the tumor is usually curative. Here we present a 44-year-old woman with giant hepatic hemangioma causing Kasabach-Merritt syndrome managed by enucleation.

Introduction

Cavernous hemangiomas are the most common benign tumors of the liver. Giant cavernous hemangiomas are those larger than 4 cm in diameter and can reach enormous sizes. The diagnosis should not be augmented by biopsy because of the risk of hemorrhage [1]. Enucleation is an underused procedure that if carefully performed allows resection of giant hemangiomas with reduced blood loss and preservation of virtually all normal hepatic parenchyma [2]. Kasabach-Merritt syndrome (KMS) is a consumptive coagulopathy caused by hemangioma. The mortality rate of this syndrome is 10-37% [3]. Here we present a 44-year-old woman with giant hepatic hemangioma causing KMS managed by enucleation.

Case Report

A 44-year-old female presented with pain persisting for two months on the right upper abdominal quadrant. An abdominal ultrasound performed one month earlier showed a mass in the liver. She had been examined by a gynecologist two years before due to dysmenorrhea and her clotting tests revealed that she had a prolonged clotting time but no cause was found. She did not use any medication including oral contraceptives. Physical examination was normal. Complete blood count showed that she had trombocytopenia (platelet count 20,000/mm3). The international normalized ratio was prolonged (table 1) and Quick test time was shortened. Abdominal ultrasound and contrast computerized tomography revealed two different masses on the liver. One of the masses was a 46 × 27 mm hypovascular inhomogeneous mass with centrally cystic degeneration on segment 2. The other mass was a 218 × 158 × 128 mm giant mass on the right lobe with the same characteristics (fig. 1, fig. 2). Laparotomy revealed multiple numerous microhemangiomas on the remaining liver. The major hemangioma was totally enuclated (fig. 3), but the lesser one was located on the middle of the left lobe and could damage the remaining liver tissue and so was not suitable for excision. The major hemangioma weighed 2,800 g and measured 25 × 19 × 9 cm. The postoperative course was uneventful. Platelet count was normal on postoperative day 3. Pathology was consistent with cavernous hemangioma (fig. 4). The 6-month control visit was uneventful.

Table 1

Clotting tests of the patient

	One week before surgery	Preoperative	Postoperative day 7	Normal range
Trombosit	190	87	251	150–450
Quick test	88	49	109	70–130
INR	1.07	1.53	0.95	0.90–1.25
APTT	30	33	31	25.9–125.0

Fig. 1

Axial CT image of the hemangioma.

Fig. 2

Coronal CT image of the hemangioma.

Fig. 3

Surgically removed hemangioma.

Fig. 4

Microscopic appearance of the hemangioma.

Discussion

Cavernous hemangiomas are the most frequent type of benign liver tumor mostly discovered unexpectedly, either when patients undergo routine examination for nonspecific abdominal complaints or during laparotomy [4]. KMS is a rare but serious complication defined by a huge hemangioma with thrombocytopenia and consumption coagulopathy due to endothelial defects within the hemangioma. More than 80% of cases occur within the first year of life [5]. The etiology and malignant transformation is unknown and the typical patient is an infant, often male [6]. Mostly they remain asymptomatic and are discovered incidentally. Rarely a large hemangioma may cause right upper quadrant pain, but the potential for rupture is negligible and does not in itself constitute an indication for resection [7,8]. The hematologic features of KMS and those of chronic coagulopathy seen with other vascular malformations can be similar, which makes KMS difficult to distinguish [9].

In the diagnostic process, these lesions must first be distinguished from hepatic malignancies. The widespread use of ultrasound and computed tomography scanning has made the occasional finding of a ‘nonhomogeneous area’ more common. Magnetic resonance imaging and computed tomography reveal a vascular enhancing mass which is difficult to differentiate from a vascular malformation [6]. Magnetic resonance imaging has reported sensitivities and specificities of up to 100% by gadolinium administration and is the preferred imaging technique for lesions smaller than 15 mm [10].

Treatment of this syndrome is often difficult, but resection of the tumor is usually curative. Since they are benign lesions, treatment is not imperative. There are two major treatment objectives, the control of the coagulopathy and thrombocytopenia as well as eradication of the hemangioma. Different treatment regimens are performed, including systemic corticosteroids, irradiation, compression, embolization, antifibrinolytic agents, platelet aggregation inhibitors, interferon low dose heparin infusion, cryoprecipitate and aminocaproic acid [11,12,13,14,15,16,17,18]. Surgery should be limited to symptomatic or complicated cases. However, Velin et al. suggested that removal of localized hemangiomas in nonfunctional areas is the most appropriate treatment for the patients with KMS [19]. There have been reports of ‘enucleation’ of the tumor [20]. We treated the patient by excising only one hemangioma because there was not sufficient residual liver tissue. Instead we cauterized the mass and still we treated KMS. Extremely rarely, hemangiomas of the liver require liver transplantation. Meguro et al. [6] and Klompmaker et al. [21] described one case of successful liver transplantation in an adult with giant hemangiomas and KMS.

In conclusion, KMS is a complicated disease due to its mortality and difficult treatment modalities. Surgical treatment is still controversial but the only curative modality.