Lymphatic malformations in children: retrospective review of surgical and interventional management

Short-term Postoperative Complications of Lymphatic Malformation Surgical Excision: A 20-Year Institutional Review

OBJECTIVE

To evaluate outcomes and postoperative complications following surgical resection of lymphatic malformations (LMs) at a single multidisciplinary vascular anomalies center.

METHODS

A single-center retrospective review of all patients ≤21 years old who underwent surgical resection of a lymphatic malformation at a quaternary referral center with a multidisciplinary vascular anomalies team from 2004 to 2024. Data pertaining to postoperative outcomes and treatments was abstracted.

RESULTS

A total of 109 surgical procedures were included and examined. The most common 30-day postoperative complications included: seroma (18.3 %), superficial surgical site infection (18.3 %), and wound dehiscence (12.8 %), with lower rates of nerve palsy/injury (5.5 %), lymphedema (2.8 %), hematomas (3.7 %), and abscesses (4.6 %). An interventional radiology procedure within 30-days postoperatively was required for management of seroma in 8 patients (7.3 %), while 7 (6.4 %) patients required reoperation. Among patients who underwent attempted complete resection, recurrence of the LM was documented in 32.0 % (16/50). Subjective quality of life improvement was noted in 69.7 %. There was no difference in incidence of postoperative complications reported in patients who underwent preoperative sclerotherapy vs those that did not (p = 0.980).

CONCLUSION

Seroma and surgical site infection were the most reported short-term postoperative complications followed by wound dehiscence with low rates of other complications in surgical resection of LMs. Few patients required postoperative procedural intervention. Despite a relatively high rate of short-term complications, patients reported high satisfaction and symptom improvement following LM resection, which underscores the important role for surgical management of LMs in select patients.

LEVEL OF EVIDENCE

III.

TYPE OF STUDY

Cohort study.

Ex Utero Intrapartum Treatment for Prenatally Diagnosed Cervicofacial Lymphatic Malformations

INTRODUCTION

Cervicofacial lymphatic malformations (cf-LM) may be identified on prenatal ultrasound, prompting consideration of ex utero intrapartum treatment (EXIT) to secure the fetal airway. Furthermore, the recent shift in postnatal management of cf-LM from resection alone toward a multimodal approach including sirolimus and sclerotherapy may impact the neonatal outcomes of cf-LM. This study aims to characterize the neonatal outcomes of patients with prenatally diagnosed cf-LM who underwent EXIT-to-airway.

METHODS

Retrospective, single-center review of all patients who underwent EXIT-to-airway for cf-LM (2011-2020) was performed. Demographics, prenatal imaging, intraoperative details, and outcomes were analyzed using descriptive statistics (median [interquartile range]).

RESULTS

Six patients with prenatally diagnosed cf-LM underwent EXIT-to-airway at a median gestational age of 36 (33.8-36.9) wk. The median volume on fetal magnetic resonance imaging was 187.5 mL (142.3-237.8) and median tracheoesophageal displacement index was 11 mL (9.25-15). All were successfully intubated on placental support with a median duration of 25 (15.25-91) d. There was one fatality at day of life 10 due to necrotizing enterocolitis totalis. Among survivors, 2 of 5 underwent tracheostomy placement, 4 of 5 underwent gastrostomy tubes placement, and all 5 received sirolimus at day of life of 9 [8-10] d. Four patients underwent debulking or excision of their cf-LM during the initial hospitalization. Patients had a median length of stay of 68 (45-129) d. One patient experi enced a pneumothorax with evidence of barotrauma following EXIT-to-airway requiring chest tube placement (duration 8 d).

CONCLUSIONS

EXIT-to-airway procedure remains a feasible strategy for mitigating neonatal hypoxia in cases of prenatally diagnosed cervicofacial lymphatic malformations. However, postnatal outcomes are variable with potential long-term aerodigestive sequelae.

Sclerothrapy of giant lymphatic malformation in neonates

OBJECTIVE

To analyze the sclerotherapy of giant (≥8 mm) lymphatic malformations in neonates and discuss effective treatment.

METHODS

This was a single-center retrospective study. Twelve patients received bleomycin (BLM) (six patients) or BLM combined with polidocanol (POL) (eight patients). The safety and effects of BLM and BLM + POL were analyzed using a t-test for categorical data and likelihood ratios or Fisher's exact test for continuous data. Factors resulting in an increased number of treatment sessions were studied.

RESULTS

Treatment began 2-5 days after birth. The patients in the BLM group underwent more treatment sessions. Gestational age, lesion size and type, total response, and complications showed no significant differences between groups. Larger and mixed-ype lesions required more treatment sessions.

CONCLUSIONS

Both BLM group and BLM + POL group appear relatively safe and effective in neonates with giant lymphatic malformations. The combination of the two agents reduced the number of procedures and general anesthesia required.

A multi-step approach to overcome challenges in the management of head and neck lymphatic malformations, and response to treatment

BACKGROUND

Lymphatic malformations are vascular developmental anomalies varying from local superficial masses to diffuse infiltrating lesions, resulting in disfigurement. Patients' outcomes range from spontaneous regression to severe sequelae notwithstanding appropriate treatment. The current classification guides, in part, clinicians through the decision-making process, prognosis prediction and choice of therapeutic strategies. Even though the understanding of molecular basis of the disease has been recently improved, a standardized management algorithm has not been reached yet.

RESULTS

Here, we report our experience on five children with different lymphatic anomalies of the head and neck region treated by applying a multidisciplinary approach reaching a consensus among specialists on problem-solving and setting priorities.

CONCLUSIONS

Although restitutio ad integrum was rarely achieved and the burden of care is challenging for patients, caregivers and healthcare providers, this study demonstrates how the referral to expert centres can significantly improve outcomes by alleviating parental stress and ameliorating patients' quality of life. A flow-chart is proposed to guide the multidisciplinary care of children with LMs and to encourage multidisciplinary collaborative initiatives to implement dedicated patients' pathways.

Laparoscopic-assisted sclerotherapy in pediatric retroperitoneal lymphatic malformations

Background

Retroperitoneal lymphatic malformations (LMs) are rare. Currently, the treatment of retroperitoneal LMs remains challenging. This study aimed to examine the safety and efficacy of laparoscopic-assisted sclerotherapy for retroperitoneal LMs in pediatric patients.

Methods

We retrospectively reviewed patients treated with laparoscopic-assisted sclerotherapy for retroperitoneal LMs in a single tertiary medical center between July 2020 and February 2023. Doxycycline was prepared into a solution with a concentration of 10 mg/ml for use in sclerotherapy. Demographic data, clinical features, details of management, and outcomes were collected and analyzed.

Results

A total of six patients, comprising three males and three females, were identified. The LMs were categorized into four macrocystic and two mixed-cystic types. The mean age and weight were 52.2 months (range, 11-108 months) and 20 kg (range, 12.5-27.5 kg), respectively. Three patients presented with abdominal pain or distension, while the other three patients were asymptomatic. All six patients underwent a total of eight sclerotherapy sessions. Two patients experienced intra-cystic hemorrhage and required a second sclerotherapy session. Only one patient presented with vomiting after sclerotherapy, which resolved spontaneously. Five patients met the complete response criteria, and one patient met the effective criteria. The mean reduction in lesion size was 92.3% (range, 69.9%-99.6%). No further complications or recurrence were recorded during follow-up.

Conclusion

Laparoscopic-assisted sclerotherapy is a safe and effective approach for treating retroperitoneal LMs. This technique is applicable for both macrocystic and mixed-cystic retroperitoneal LMs.

Imaging manifestations of head and neck lymphatic malformations: A single-center experience of 170 surgical cases

OBJECTIVES

To discuss the imaging manifestations and the utility of preoperative ultrasonography (US), contrast-enhanced computed tomography (CE-CT) and contrast enhanced magnetic resonance imaging (CE-MRI) in diagnosing the pediatric head and neck lymphatic malformations (HNLMs).

METHODS

We performed a retrospective review of 170 children who were referred to our hospital in the past 9 years for the treatment of HNLMs.

RESULTS

The diagnostic rates of US, CE-CT and CE-MRI were 93.0% (146/157), 94.7% (143/151) and 100% (45/45), respectively. As in multilocular cases, intracystic septa detection rate was 91.5% (130/142), 50.4% (68/135) and 88.1% (37/42), and which had a statistical difference (χ2 = 25.8131, p < 0.05). US showed capsule contents anechoic in 51.0% (80/157) cases, hypoechoic or mixed echoic in 49.0% (77/157) cases, and flocculent or dotted echo floating in 36.9% (58/157) cases. CT showed low density of the capsule contents without enhancement in 69.5% (105/151) cases and mixed density with enhancement in 30.4% (46/151) cases. Liquid-liquid levers were seen in 8.6% (13/151) cases. MRI showed T1WI high signal and T2WI low signal of the capsule contents without enhancement in 28.9% (13/45) cases and mixed density in 71.1% (32/45) cases. Liquid-liquid levers were seen in 46.7% (21/45) cases. There were statistically significant differences between pure HNLMs and intracystic hemorrhage in capsule content (echo, density, signal), enhancement, and liquid-liquid lever (all p < 0.05). Among US, CE-CT and CE-MRI, intracystic hemorrhage diagnostic accuracy had a statistical difference (χ2 = 25.4152, p < 0.05).

CONCLUSIONS

For clinical diagnosis and evaluation of HNLMs, we suggest that US combined with CE-CT for acute cases, and for stable cases, US combined with CE-MRI.

Endoscopic Resection for Vascular Anomalies in Children: A New Standard

OBJECTIVE

To report an innovative endoscopic surgery for subcutaneous vascular malformations and intramuscular fibro-adipose vascular anomaly (FAVA) at our center.

BACKGROUND

Historically, open surgical resection has been the treatment of choice. Recent advances in minimally invasive surgery have led to the successful application of endoscopic resection techniques for the surgical management of diseases of soft tissue.

METHODS

Patients who underwent endoscopic resection of vascular anomalies were included in this retrospective review. Data were extracted from our Vascular Anomalies Center database between September 2019 and October 2022, including sex, age, symptoms, diagnosis, sites of surgery, previous treatment, surgery, and follow-up.

RESULTS

There were 13 females and 15 males in the current study, with ages ranging from 1 to 17 years. The diagnoses included microcystic lymphatic malformation (LM) (n = 8), Klippel-Trénaunay syndrome (n = 7), venous malformation (n = 6), FAVA (n = 6), and mixed cystic LM (n = 1). Surgical sites included the lower extremity (n = 24), abdominal wall (n = 2), upper extremity (n = 1), and thoracic wall (n = 1). Five patients had an intramuscular lesion (FAVA). The endoscopic technique used 2 or 3 small ports in a gas inflation manner. Surgery included thrombectomy, radical resection, and debulking of vascular anomalies. Postoperative sclerotherapy with bleomycin was performed through a drainage tube in 6 patients with microcystic LM. Technical success was obtained in 27 patients. The conversion to open surgery was performed in one patient owing to the deep location of the lesion. No wound-related complication was observed.

CONCLUSIONS

Endoscopic surgery is a minimally invasive, effective, and safe treatment for subcutaneous vascular malformations and intramuscular FAVA. This approach can set a new standard that minimizes wound complications and reduces recovery time in patients undergoing resection for benign soft-tissue lesions.