This report describes an adult case of hemangiolymphangioma (HL) complicated by chronic thromboembolic pulmonary hypertension (CTEPH) in a 20-year-old female patient. HL is a congenital anomaly caused by anomalous embryological development of the lymphatic and vascular system [1]. Therefore, most reports of HL have involved perinatal diagnosis [2], childhood diagnosis [3], or neonatal management [4]. Furthermore, CTEPH has not been described in HL survivors. The present report emphasizes the long-term follow-up of coagulation in HL survivors.

A 20-old-female was referred to our outpatient department with recent chest pain and severe dyspnea. She was diagnosed postnatally with systemic and multiple HLA with high-output heart failure, which pediatric surgeons operated on to remove the tumor three times in early childhood. However, the patient had residual HLA in the abdomen, thorax, and systemic skin.

After hospitalization, right heart failure was diagnosed echocardiographically as corpulmonale, supported by elevated levels of brain natriuretic peptide (577 pg/ml) and possible pulmonary thrombosis on magnetic resonance images. Initially, we did not understand the relationship between these symptoms and residual HL. We performed gastrointestinal bleeding scintigraphy (99 m Tc-diethylenetriaminepentaacetic acid-human serum albumin, 99 mTc-HSA-D) because she had unexpectedly low hemoglobin (4.5 g/dl) at hospitalization. The patient’s medical history, family history, and laboratory examinations did not reveal definitive evidence of an inherited coagulation disorder; however, we strongly suspected that she had HLA-related thrombosis due to abnormal pooling in accordance with a residual HL site (Figure 1). Therefore, we tried to start anticoagulation therapy, which improved the severe symptoms and clinical laboratory data. After improvement of her clinical symptoms, the patient was diagnosed with CTEPH because of the presence of residual pulmonary arterial hypertension based on catheterization and ventilationperfusion mismatch using scintigraphy [5]. The patient was discharged from our hospital after 1 month. Some of the previous symptoms recurred due to self-discontinuation of the antithrombotic medication.

Recently, she has started taking the antithrombotic medication again and presented at our outpatient department without symptoms. The patient had a baby at 27 years old, delivered by cesarean section. During the cesarean section, residual HLA in the abdominal cavity appeared to have a black clotting pool, similar to a bunch of grapes (Figure 2).

HL is a congenital anomaly and histologically benign tumor composed of both lymphatic and blood vessels [1] that has the potential to occur at any anatomical location, including axillary [6], the urinary bladder [3], and parotid gland [7]. Despite its benign histology, the huge cystic mass may compress, invade, and destroy normal tissue. A large left-to-right shunt flow may lead to highoutput heart failure [8]. Therefore, HL survivors might have a characteristically small size, small shunt, or successful operative extraction.

However, no reports are available on the long-term outcomes of HL survivors because of the benign character of HL. Furthermore, thrombosis has not been reported in HL. In the present case, hemorrhage scintigraphy provided a possible diagnosis of pulmonary thrombosis. The patient was definitively diagnosed with pulmonary thrombosis based on the recurrence of symptoms without

anticoagulation.

When considering the cause of CTEPH, it is important that HL does not have only two histological components, but also two functions. The lymphatic aspect of HL is cystic mass formation in which the cyst is filled with lymph fluid but does not affect systemic circulation. On the other hand, the blood vessel aspect has the communication with normal vessels, which may cause highoutput heart failure due to a left-to-right shunt [8]. The latter is an important function in the long-term follow-up of HL survivors. Operative findings elucidate a close relationship between CTEPH and residual HL.

Clinical symptoms may be relieved in HL survivors who undergo surgery, but survivors with left-to-right shunt might experience CTEPH during long-term followup. 99 mTc-HSA-D scintigraphy is useful for examining the left-to-right shunt in residual HL.