Cystic Hygroma Workup
- Author: Jason L Acevedo, MD; Chief Editor: Glenn C Isaacson, MD, FACS, FAAP more...
Laboratory Studies
Studies have suggested that fluorescent in situ hybridization (FISH) can be used to evaluate for cystic hygroma (CH) in prenatal chromosomal analysis. Chromosomes 13, 18, 21, X, and Y are specifically mentioned.[3]
Imaging Studies
MRI, CT scanning, and ultrasonography are all helpful in delineating the nature of a cystic neck mass. CT scanning and MRI reveal ringlike margin enhancement with sharp demarcation of cystic areas. The cystic areas tend to appear circumscribed and discrete. A poorly defined isodense mass that obscures muscle and fatty planes is more consistent with a microcystic lymphatic malformation than a CH.
- MRI: MRI is the consensus study of choice. It provides the best soft tissue detail and can delineate the relationship of the lesion to underlying structures. Contrast can be used to differentiate hemangiomas from lymphangiomas. On MRI, CHs appear hyperintense on T2-weighted images and hypointense on T1-weighted images.
- CT scanning: CT scanning is faster and may be more readily available than MRI. CT scanning carries the risk of radiation exposure, and detail is lost if the CH is surrounded by tissue of similar attenuation. Contrast helps to enhance cyst wall visualization and the relationship to surrounding blood vessels. On CT scans, CHs appear isodense to cerebrospinal fluid (CSF). See the image below.
Reconstruction of CT in sagittal dimension. This patient was intubated because of respiratory distress caused by the large lymphatic malformation. - Ultrasonography: This is the least invasive study. It is very useful in demonstrating the relationship of CH to the surrounding structures. Ultrasonography has limited ability in assessing mediastinal and retropharyngeal structures. It can be used to detect CH in utero. Echographic visualization of multiple septae in fetal CH has been postulated to be a poor prognostic indicator.
- Plain radiography: With any large mass of the head and neck, airway radiography (high-kilovolt anteroposterior and lateral neck radiographs or airway fluoroscopy) can be helpful in delineating possible airway compromise. Plain radiography is a reasonable initial imaging modality in the evaluation of a neck mass with a potential airway manifestation.
- Lymphoscintigraphy: A case report highlighted the ability to visualize CH using lymphoscintigraphy.
Procedures
Several recent studies have documented the use of ultrasonography-guided endoscopic biopsy for diagnosis of GI lymphatic malformations.[4]
Histologic Findings
CHs are composed of large irregular sinuses with a single layer of flattened epithelial lining and fibrous adventitial coats. The thickness of the vessel wall varies, with both striated and smooth muscle components. CHs are identical to cavernous forms under a microscope; only the gross appearance of the cyst can be used to differentiate them.
Although most CHs are multicystic, in approximately 10% of cases, a unilocular cyst is found. Cysts can range from 1 mm to several centimeters in size and are filled with clear-to-straw–colored fluid, which is eosinophilic and protein rich. Individual cysts may be isolated or may freely communicate. The surrounding stroma is fibrous or fatty and may contain lymphoid aggregates, smooth muscle, or other local tissues.
Lymphangiomas may contain multiple subtypes (ie, capillary and cavernous) and, in these instances, are categorized based on the predominant subtype. In addition, lesions with a hemangiomatous component are considered hemangiolymphangiomas. Hemorrhage into the cyst is common and can be secondary to trauma or spontaneous bleeding.
Capillary lymphangiomas contain capillary-sized lymphatic channels that involve the epidermis. Cavernous lymphangiomas infiltrate surrounding structures and are dilated lymphatic channels. CHs (cystic lymphangiomas) are cystic masses lined by a single layer of endothelium with a connective tissue stroma.
Staging
Classification has been marred by a historical lack of conformity. In 1877, the first system was proposed by Wegener. In 1982, Mulliken and Glowacki presented a cell-based classification that is currently used by many authors.[5] Their system stratifies lesions into hemangiomas or vascular malformations. CHs fall into the latter category. The World Health Organization (WHO) recognizes 3 types of lymphangiomas: capillary, cavernous, and cystic.
Central in a discussion of CH is the understanding that it is synonymous with macrocystic lymphatic malformation and cystic lymphangioma.
Giguere et al have proposed categorization of lymphangiomas based on the size of the cystic component, as follows:[6]
- Macrocystic - Cystic spaces at least 2 cm
- Microcystic - Spaces less than 2 cm
- Mixed lesions
de Serres et al have proposed the following system for staging of CH of the head and neck:[7]
- Stage I - Unilateral infrahyoid (17% complication rate)
- Stage II - Unilateral suprahyoid (41% complication rate)
- Stage III - Unilateral and both infrahyoid and suprahyoid (67% complication rate)
- Stage IV - Bilateral suprahyoid (80% complication rate)
- Stage V - Bilateral infrahyoid and suprahyoid (100% complication rate)
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