Klippel-Trenaunay-Weber syndrome (KTWS) is a very rare syndrome that involves three conditions: Cutaneous hemangiomas, varicosities, and soft-tissue hypertrophy of the affected limb. There are few cases of ischemic infarction with KTWS. Here, we describe a case of KTWS with ischemic stroke.

A 43-year-old man was diagnosed with KTWS with ischemic stroke. His chief complaints were worsening weakness and spasticity in the right leg. These symptoms had been present for 1 year, but the patient did not receive comprehensive rehabilitation until he underwent a 3-week integrated inpatient rehabilitation program at our center. After the program, his muscle strength, walking ability, and exercise endurance improved. Although relatively rare, clinicians should consider the possibility of a thromboembolic event in KTWS patients. Integrated rehabilitation can help such patients to recover function.

In conclusion, although rare, patients with KTWS may experience central nervous system vascular malformations and accompanying stroke. It is necessary to investigate whether such patients have any neurological or comorbid abnormalities. Even in the subacute or chronic period after neurological insult, integrated rehabilitation programs can lead to structural and functional enhancement.

Klippel-Trenaunay-Weber syndrome (KTWS) is a rare vascular disorder distinguished by hemihypertrophy, variceal veins, and port-wine stains. Klippel and Trenaunay first described Klippel-Trenaunay syndrome (KTS) in 1900 as hemihypertrophy and varicose veins[1]. In 1907, Weber described KTS in more detail and called the disease KTWS when a port-wine stain was present with KTS. The vascular malformations caused by KTWS generally influence the capillary, venous, and lymphatic systems of the legs[2]. Central nervous system (CNS) vascular anomalies, especially rapid blood flow vascular anomalies such as arteriovenous brain malformations and arteriovenous fistulas, are common in KTWS patients, whereas slow blood flow vascular anomalies, also known as CNS-associated cavernous angiomas, are rare[3]. In addition to vascular malformation or hemimegalencephaly, hemorrhagic or ischemic strokes have rarely been reported in KTWS[5].

Here, we report a case of cerebral infarction related to KTWS, with a literature review.

KTWS with ischemic stroke.

The patient was given 10 mg of oral baclofen daily. We developed an exercise program to improve his muscle strength and blood flow of the right leg, consisting of resistance and aerobic exercises (Table 1). The heavy resistance exercise consisted of knee extensions after fastening a 1.3-kg sandbag around the right ankle. The patient performed three sets of 10 extensions at 50% of his maximum walking speed, 5 d per week, for 3 wk. In another resistance exercise, a Thera-Band was applied to the ankle while the patient was lying on the floor, with the metatarsal heads of his right foot fixed. The knee was fully stretched with the Thera-Band extended to 170% of its resting length, as has been done elsewhere[4]. Each resistance exercise session took around 30 min to complete. The aerobic exercise included 20 min on a treadmill at 50%-70% of the patient’s maximum walking speed for 5 d per week for 3 wk. The patient’s maximum walking speed was based on the result of a 1-min walk test. He was instructed to walk as fast as he could without running. After 3 wk of the exercise program, the ABI, thermographic outcomes, strength level, and gait function were reassessed. The strength of the patient’s right leg as well as his walking speed and walking endurance all improved (Table 2), and the differences in leg temperature and ABI decreased (Figure 4).

The patient’s resistance and aerobic exercises focused on his right leg. As a result, his muscle strength, gait speed, and exercise endurance improved (Table 2). We think that these results were related to improved vascular factors, although the improvement in vascular factors was measured indirectly using the ABI before and after the training regimen.

KTWS is a congenital disease that is typically discovered in childhood, although some patients may not be diagnosed until adulthood due to the varying degrees of severity. Our patient was diagnosed with KTWS late in life due to his mild symptoms. The first and most common sign of KTWS is capillary hemangiomas or port-wine stains. The exact etiology and pathogenesis of KTWS remain unclear. It may be associated with RASA1 gene mutations in some patients, but genetic abnormalities are not present in most cases of KTWS[1,5].

The CNS abnormalities reported in KTWS include hemorrhage, infarction, hemimegalencephaly, cavernomas, and arteriovenous malformations[5]. Deep vein thrombosis and pulmonary embolism have been reported with KTS, but cerebral infarction related to KTWS is rare, and the stroke mechanism remains unclear. A few KTWS patients have had transient ischemic attacks and patent foramen ovale[6]. Grira et al[7] reported a patient with KTWS presenting with stroke, who also had antithrombin III deficiency. In a KTWS patient with recurrent cerebral infarction, fibromuscular dysplasia in the carotid artery was observed[5]. Arterial vascular malformations such as intracranial aneurysms and carotid artery dissection have also been seen in KTWS-related stroke[8]. In the cases described above, the KTWS patients had risk factors for stroke. There is additionally a report of a KTWS patient with both ischemic stroke and cerebral hemorrhage; the cerebral infarction occurred first, and cerebral hemorrhage occurred after the administration of 100 mg of acetylsalicylic acid. The underlying etiology of both events remained undetermined, but increased vascular fragility might have been a cause[9].

In this study, there were no abnormal findings suggesting the focus of the thromboembolic event, including those from the blood coagulation tests and cardiac evaluation. The patient experienced asymmetry from childhood but received no medical services. We could not determine exactly when the stroke occurred, and it might have been a cryptogenic stroke. Although time-resolved MRA did not entirely exclude a small arteriovenous malformation or cavernous angioma, the only specific findings were infarction, a small presumed capillary telangiectasia in the left pons, and hypotrophy in the left midbrain. Anticoagulation was not considered because there were no abnormal findings that could cause a thromboembolic event, and cerebral hemorrhage had been observed to follow aspirin administration for cerebral infarction in a KTWS patient[9].

The ABI is the ratio of the blood pressure in an ankle to that in an arm and is a sensitive, non-invasive marker for diagnosing peripheral arterial disease (PAD). Without PAD, increased arterial impedance due to narrowed distal arteries increases the arterial blood pressure farther from the heart. Consequently, the systolic pressure in the ankle is usually higher than those of brachial arteries. People with no PAD have an ABI between 1.10 and 1.40[10]. We examined the differences in ABI and temperature in both legs although there were no stenotic lesions on CTA. To improve perfusion in the right leg, resistance and aerobic exercises were prescribed. After the exercise program, the ABI improved, reflecting improved peripheral artery stiffness and blood flow[11]. Resistance exercise training can increase muscle fiber size and tissue capillary networks[12]. The increased metabolites from contracting muscle diffuse to resistance arterioles and directly induce vasodilation; prolonged exercise prompts angiogenesis and increases peripheral blood volume[13]. The blood flow capacity of skeletal muscle increases with training, causing structural vascular remodeling within skeletal muscle, such as angiogenesis and remodeling of the arterial tree within skeletal muscle[12].

In conclusion, although rare, patients with KTWS may experience CNS vascular malformations and accompanying stroke. It is necessary to investigate whether such patients have any neurological or comorbid abnormalities. Even in the subacute or chronic period after neurological insult, integrated rehabilitation programs can lead to structural and functional enhancement.