Noteworthy effects of a long-pulse Alexandrite laser for treatment of high-risk infantile hemangioma:A case report and literature review

Wen-Ting Su,Ji-Xin Xue,You-Hui Ke

Abstract

Key words: Alexandrite laser;Infantile hemangiomas;Treatment;Case report

INTRODUCTION

Infantile hemangiomas (IHs),affecting approximately 10% of infants younger than 1 year old,are true neoplastic proliferations of endothelial cells and the most common type of congenital benign vascular tumors during infancy[1,2].IHs have a typically characteristic growth curve with an initial proliferation phase for several months followed by a spontaneous regression phase for several years[3-5].However,involution does not mean disappearance;children may be left with a residual deformity,such as scarring,anetoderma,fibrofatty residuum,destroyed anatomical structures,redundant skin,and telangiectasias[6].In addition,owing to the risk of complications,including discomfort or pain,infection,ulceration,and permanent discoloration or scarring[7,8],IHs located in particular anatomic areas (such as in the perineum,nose,ear,lip,periorbital,oropharyngeal,and parotid regions),those with complications,and those which are ulcerated need rapid and active treatment[3,9].

There is no standardized management strategy for IHs,but several treatment modalities have been used to manage the growth of IHs and to increase the speed of involution,including steroids,interferon-α,vincristine,propranolol,surgical excision,and laser therapy.With regard to laser therapy,it was reported that pulsed dye laser(PDL) treatment,as a safe and effective option that has been used for many years,limits superficial IH proliferation and increases complete clearance rates[7,10,11].However,because of its limited penetration,PDL treatment was not very effective for thick/deep IHs[12,13].In our previous study,we proved that treatment of thick/deep IHs with a long-pulse Alexandrite laser was clinically effective and safe[14].In the current study,one infant with a rapidly growing and thick IH located on the right labia majora was treated using a long-pulse Alexandrite laser because of the particular location that makes this IH harbor a high risk of ulceration,infection,and even scarring.Finally,a noteworthy effect was obtained without severe complications.We also briefly review the literature,emphasizing the pros and cons of other options for the treatment of IHs.Because most patients with IH present with superficial or nonorgan dysfunctional lesions,clinicians should be noted the indications for treatment.Generally,accepted indications of treatment for IH are summarized by the acronym GLUT-ONE and include liver and/or other visceral organ involvement,giant infantile hemangiomas,and ulcerated or bleeding infantile hemangiomas;this acronym can help clinicians make rapid treatment decisions.

CASE PRESENTATION

Chief complaints

A purplish spot located on the right labia majora for 2 months.

History of present illness

A two-month-old girl presented to our department with her parents.She was born at full-term (38 wk) and weighed pproximately 3300 g.Three weeks after birth,she was noted to have a light purplish spot located on the right labia majora.The vascular lesion promptly grew in size over a period of 5 wk.No ulcers or hemorrhagic areas were noted externally.No prior treatment had been administered.

History of past illness

Unremarkable.

Personal and family history

There were no similar patients in the family.

Physical examination upon admission

Physical examination showed that the right labia majora was covered with a thick hemangioma (Figure 1A).

Laboratory examinations

There were no suitable laboratory examinations.

Imaging examinations

There were no suitable imaging examinations.

FINAL DIAGNOSIS

Because of the characteristic clinical course,such as appearing in the first few weeks following birth and exhibiting a characteristic sequence of growth,a diagnosis of IH was supported.

TREATMENT

The study protocol conformed to the ethical guidelines of the 1975 Declaration of Helsinki,and the family was informed in detail of the likely risks,benefits,and potential complications of the treatment and about the other therapeutic alternatives available.Written informed consent was obtained from the patient's parents for publication of this case report and any accompanying images.

Treatment with a long-pulse Alexandrite laser was administered to the IH at 4-to 6-wk intervals with laser settings as follows:3 ms pulse duration;8 mm spot size;45 to 50 J/cm2fluences,adjusted as needed to achieve the correct treatment endpoint at each treatment session;and concurrent dynamic cooling device (DCD) cryogen spray spurt duration of 90 ms with 80 ms delay.The target treatment endpoint with the long-pulse Alexandrite laser is transient gray discoloration of the skin followed by lasting purpura,and it was attempted and achieved in nearly all treatment session.No areas were double-pulsed.For posttreatment care,a topical antibiotic cream(Fusidic acid,Bright Future Pharm,Hong Kong) was applied once a day for approximately 1 wk.

OUTCOME AND FOLLOW-UP

As described in the previous study[14],the patient had taken photographs before the first treatment,at regular intervals during treatment,and at four months and ten months after the final treatment.The infant was examined for clinical assessment,treatment compliance,and tolerance.Treatment with the long-pulse Alexandrite laser was initiated on the day of the evaluation.Improvement was noted after the first treatment session,and the IH showed a reduction in thickness (Figure 1B).After two treatment sessions,the IH showed a remarkable reduction in size,thickness,and appearance with part of the IH nearly completely regressing (Figure 1C).Following the next two treatment sessions,the size of the IH decreased dramatically,and the appearance improved further without any sign of relapse (Figure 1D and E).Ten months after the last treatment,the patient was reexamined,and the IH had completely regressed without adverse effects such as hypopigmentation,dyspigmentation,or scarring (Figure 1F).

During the laser treatment,no severe side effects were observed;blistering occurred only immediately after treatment and then scabbed over the next day,gradually improving in the following days (Figure 2A and B).

DISCUSSION

Figure1 The patient before,during,and after treatment with a long-pulse Alexandrite laser.

IH is the most commonly observed benign vascular tumor in infants with a reported incidence of approximately 10%[1,15].The incidence is three times higher in females than in males and is especially prevalent in premature infants because lower birth weight and younger gestational age are associated with tumor development[16].However,the patient in this case report is a female,but full-term infant.

Most IHs (70% to 80%) can be left untreated and allowed to follow their natural course without negative consequences[17,18].Unfortunately,in the other cases,it is now possible to find residual changes such as fibrofatty tissue,scarring,or simply telangiectasia,wrinkling,and dyspigmentation,which significantly affect the patients and their families both physically and psychologically[16].Moreover,it is difficult to predict the possible occurrence of functional impairments and complications[19,20].As a result,the timing of IH treatment is important but difficult to determine.Many IHs do not require any treatment,but only a close observation of the infant made through periodic visits.Specialists should continuously monitor IHs through measurements and photographs,not only with the aim to check on the situation but also to help the patient’s parents better understand that the “wait and see” approach is feasible and to provide them with emotional support.The factors leading to aggressive treatment are essentially as follows[16]:Specific anatomical location with high aesthetic risks,ulceration/infection or likeliness of ulceration/infection/scarring,potential of the IH to limit some important functions,and presence of life-threatening risks.In this case report,the particular location (labia majora) of the IH caused it to be high risk for ulceration,infection,and even scarring,so active treatment was needed.

When treatment is needed,the best choice involves many factors that physicians must take into consideration:Depth,size,anatomic location,phase of the IH,age of the patient,and physician’s experience[16].Treatment modalities can include medical management,laser therapy,or a surgical approach.

Since the first case reported by Zarem and Edgerton,systemic corticosteroids are commonly used for treatment of orbital IHs,segmental IHs,and other large and (or)aggressive IHs elsewhere in the patient’s body.However,the efficacy of systemic steroids is limited by numerous potential side effects,such as behavior changes,Cushingoid appearance and growth delay,irritability,and increased susceptibility to infection[21-24].Although reversible,these side effects can be too difficult for parents to endure.Fortunately,systemic steroids are now the second-line treatment for IH in the senior author’s practice.

Figure2 Side effects observed during laser therapy.

Propranolol,a nonselective oral beta-blocker,was serendipitously discovered to be clinically effective for the treatment of cutaneous IH by Léauté-Labrèzeet alin 2008[25].Since then,the large-scale use of propranolol for the treatment of IH has been prompted,and its promising effectiveness in IH has been demonstrated.In the following years,investigators confirmed that propranolol was effective in the treatment of IH at all sites on the body[26-28].Regression of IHs and improvement of ulcerated ones with the administration of propranolol in patients younger than 12 mo were documented[29].The drug works well if started at 2 to 3 mg/kg/d and divided into 2 or 3 doses,and it can be used for 3 to 9 mo.The results can be very rapid,and gradual discontinuation can take 3 to 4 wk[25,30].Currently,propranolol is a first-line treatment option for IH.Despite its widespread use,several adverse events of propranolol should be considered,such as transient hypoglycemia,insomnia,bronchospasm,bradycardia,and hypotension.

Additionally,topical timolol maleate,a nonselective β-blocker that comes as a solution or gel-forming solution,is used alone or in conjunction with oral propranolol for the treatment of IH.However,laser therapy provides better results than timolol solution because it penetrates deeply enough to reach the deep dermal blood vessels[31,32].Other pharmacologic agents,including interferon-α and vincristine,were used occasionally for the treatment of IH.Owing to their potential severe side effects,such as neurotoxicity with use of interferon-α and peripheral and autonomic neuropathies with use of vincristine[33-35],the use of interferon-α and vincristine for the treatment of IH was not recommended as first-line therapy.

The aim of laser treatment of IH is to maximize vascular damage while minimizing epidermal and dermal injury.The efficacy and safety of laser treatment in dermatology was completely improved in 1983 due to the introduction of the selective photothermolysis theory by Anderson and Parrish[36].Numerous studies have confirmed the efficacy of PDL treatment,especially for the treatment of superficial IHs[37,38].However,it was not very effective for thick/deep IHs,because of the limited penetration of the laser.In our previous study,we treated IHs,including superficial and thick/deep ones,using a long-pulse Alexandrite laser with the following settings:3 ms pulse duration,6-8 mm spot size,and 45-70 J/cm2fluences.As expected,very significant improvement accompanied by relatively few complications was observed in the group with thick/deep IHs[14].These results indicated that the long-pulse Alexandrite laser may be more efficacious than the PDL for the treatment of IHs with a prominent deep or hypertrophic component because of the greater depth of penetration of the Alexandrite laser.However,the disadvantage of the long-pulse Alexandrite laser is that higher fluences are needed compared with the PDL,and this significantly increases the risk of deep dermal heating and associated side effects,such as tissue breakdown,ulceration,dyspigmentation,and scarring[14].In this case report,a decision to treat IH with a long-pulse Alexandrite laser was made after an extensive discussion with parents about the risks and benefits of different treatment modalities.On the other hand,due to the significantly greater tissue penetration of the laser,the risk of scarring with Alexandrite lasers appears to be greater than the risk with PDLs reported in the treatment of port wine stains (PWS)[39,40].To prevent the occurrence of scarring,relatively conservative parameters were recommended in the treatment of IH using a long-pulse Alexandrite laser.In the current study,relatively conservative fluences of 45 to 50 J/cm2were adopted.In addition,a higher cooling setting of the DCD was used to provide more protection.

A neodymium:Yttrium-aluminum-garnet (Nd:YAG) laser has also been used occasionally for treating IHs with a prominent deep component[31,41,42].However,the challenge of the Nd:YAG laser for the treatment of vascular lesions is the narrow therapeutic window.Forthermore,increasing the fluences to greater than 20% beyond the minimal purpuric dose can cause dermal blisters and scarring and deep dermal damage[43-45].

Surgical treatment can be seen from two different points of view:Early surgery and late surgery[16].Early surgery has a relevant role for IH during the proliferative phase,which is drug-resistant and/or function-impairing and/or complicated by ulcerations and persistent bleedings.Late surgery can be useful to repair residual deformities,typically observed after regression,including:Anetoderma,destroyed anatomical structures,fibrofatty residuum,redundant skin,wrinkles,scarring,dyspigmentations,and telangiectasias.The main risk correlated with the surgical a approach is the induction of post-healing scarring.

CONCLUSION

Despite decades of development,treatment of IH remains a major challenge.Recently,the combination of laser therapy and drugs in IH treatment in various approaches for increased efficacy is a growing trend.Combination treatments may have potential benefits,including possibilities of synergistic effects,greater efficacy,and lower toxicity of drugs.Several researchers have reported that IH treatment using a combination of propranolol and PDL therapy resulted in significantly better improvement compared to either treatment alone[46,47].Whether a PDL is the optimal laser for use in combination with propranolol remains to be investigated.We speculate that it would be more effective to treat the IH reported in this study with a combination of a longpulse Alexandrite laser and propranolol.We are now performing a clinical trial of propranolol-Alexandrite laser combination therapy compared with monotherapy to further advance the treatment of IH.