Cystic lymphangiomas, also known as lymphatic malformations Cystic lymphangiomas, also known as lymphatic malformations, are rare benign dyssembryoplasias of the lymphoganglionic system, responsible for a tumor syndrome caused by angiolymphatic proliferation leading to lymphatic sac filling (Miloundja et al., 2007) . Their anatomical location is almost exclusively cervicofacial and their clinical onset is generally very early (Perkins et al., 2010) . Diagnosis is suspected on the basis of clinical and imaging findings and confirmed by pathological examination after surgical excision. It mainly affects children under 2 years of age (90% according to authors), of whom 50% - 65% are diagnosed at birth and 75% in the first year of life (Zainine et al., 2012) . We report an exceptional case of cervical cystic lymphangioma in a 56-year-old adult.

This was a 56-year-old female patient, with no tare or pathological history reported, who consulted for a voluminous right laterocervical swelling that had progressed over 7 years without signs of compression.

Physical examination revealed a voluminous right laterocervical mass measuring 21 cm in vertical long axis and 14 cm in transverse short axis, taking in the right jugulocarotid region, extending superiorly into the sub-maxillary region, posteriorly into the retro-spinal region, and bordering inferiorly in the supra-clavicular region and anteriorly in the pre-tracheal region (Figure 1). The mass was soft, irregularly surfaced, painless, mobile in relation to the deep planes and non-pulsatile. There were no sensitivomotor disturbances in the homolateral upper limb.

A cervical CT scan revealed a voluminous, thin walled, multicompartmental cystic mass on the right laterocervical side, pushing the right jugular vein medially and anteriorly, and the common carotid artery medially, and remaining in contact with their walls (Figure 2).

We diagnosed a cystic lymphangioma and decided to perform surgery. The operation consisted of excision by dissection with a large starfish incision beforehand, removing a large quantity of skin tissue. The aim was to facilitate exposure and skin adhesion on both sides of the mass. We found a multi-loculated mass with pockets of clear liquid content and other hematic. There were a few ruptured pockets. The excision was considered total and complete. The post-operative course was straightforward. Histology confirmed the diagnosis of cystic lymphangioma (Figure 3). There was no recurrence after 1 year of clinical and ultrasound monitoring (Figure 4).

Lymphangiomas are rare benign tumors. They can be found in the abdomen, thorax, and cervical region. The cervicofacial region is the preferred site in 75% of cases (Zainine et al., 2012) . Cystic lymphangioma is a malformative lesion usually presenting in infancy (Owono et al., 2021) . It accounts for 5% to 25% of vascular tumors and 6% of benign tumors in children. All ages combined, the incidence would be 0.8% of benign tumors and 0.1% of benign cervico-facial tumors (Oosthuizen et al., 2010) . A few rare cases in young adults have been described between 20 and 30 (Owono et al., 2021; Sakthivel et al., 2018; Mukakala et al., 2020) . However, discovery beyond the age of 50 remains exceptional, as shown by Bentebbiche’s series in which the mean age of patients was 19.9 years, with extremes of 2 months and 59 years. The age group over 50 is the least representative, with 6% (Bentebbiche et al., 2020) . Our patient was 56 years old and presented with a large cervical cystic lymphangioma that had been evolving for 7 years. The pathophysiology of lymphatic malformations remains poorly understood, despite very recent advances in biology and knowledge of the lymphatic system (Lerat et al., 2019) .

Two pathogenic theories are mentioned in the literature:

­ The traumatic theory explains the occurrence of these cysts by lymphatic obstruction or contusion; but this theory is rarely confirmed by clinical history (Handa et al., 2004) .

­ The congenital theory is currently the most widely accepted. Lymphangiomas are thought to arise from sequestration of an embryonic lymphatic sac, which gradually fills with lymphatic fluid (Anne et al., 1992) . If this theory explains our case (in which the mass gradually increased in size), how can we explain the long latency, given that 50% of cysts are present at birth and 90% are diagnosed within the first two years (Giguère et al., 2002) .

Cervico-facial cystic lymphangiomas are most often discovered following the appearance of a cervical mass (50% - 67% of cases (Chen et al., 2009) . On physical examination, the swelling is soft, fluctuating, mobile and non-adherent to the superficial and deep planes, with positive transillumination, increasing in volume on crying and coughing. Size can vary from 1 to 30 cm. The swelling may be uni or bilateral, and outside infectious outbreaks the skin is healthy (Jean-Gilles & Brice, 2022) . The left side is often the most affected (Sjogren et al., 2017; Bentebbiche et al., 2020) whereas in our patient, it was a right later cervical mass.

Ultrasound and computed tomography provide more information on the topographical features and contents (liquid, pseudo-liquid, cavernous) of this tumor (Oosthuizen et al., 2010) . However, in addition to ultrasound findings, CT and MRI provide an initial pre-surgical work-up, highlighting infiltration of surrounding soft tissues and relationships with large vessels (Guruprasad & Chauhan, 2012) .

Some authors maintain that MRI remains the examination of choice, especially in small children, and enables the diagnosis to be made, the extension of the cyst to be seen, and helps in the choice of treatment (Bentebbiche et al., 2020) .

Histologically, it is a proliferation of small, thin-walled lymphatic vessels associated with fibrous tissue (Bahl et al., 2016) .

Current management involves either surgery or sclerotherapy (Zainine et al., 2012) . Our patient was treated surgically, and the follow-up was straightforward, with no sign of recurrence at 1-year follow-up. However, even after 4 years of follow-up, the risk of recurrence still requires monitoring (Zounon et al., 2022) .

Cystic lymphangioma in adults in their fifties is a rare malformation. It is most frequently found in the cervix, but rarely on the right side of the cervix. Diagnosis is radiological, with histological confirmation. Management is often surgical. Long-term post-operative surveillance is essential, however, as this is a recurrent lesion.

The authors declare no conflicts of interest regarding the publication of this paper.

Faty, A., Awam-Amioth, P., Ndiade, A., Loum, B., Sy, A., Diallo, O. A., & Diallo, B. K. (2024). Cervical Cystic Lymphangioma in an Adult in His Fifties: A Case Report. Voice of the Publisher, 10, 37-42. https://doi.org/10.4236/vp.2024.101003