lymphangioma

嚢胞性リンパ管腫 　

WordNet

1. benign angioma consisting of a mass of lymphatic vessels

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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2015/09/14 10:40:29」(JST)

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Not to be confused with Lymphohemangioma.

Lymphangioma
Lymphangioma (Cystic Hygroma)
Classification and external resources
Specialty	oncology
ICD-10	D18 (ILDS D18.100)
ICD-O	9170/0
DiseasesDB	7665
eMedicine	derm/866

Lymphangiomas are malformations of the lymphatic system characterized by lesions that are thin-walled cysts; these cysts can be macroscopic, as in a cystic hygroma, or microscopic. The lymphatic system is the network of vessels responsible for returning to the venous system excess fluid from tissues as well as the lymph nodes that filter this fluid for signs of pathogens. These malformations can occur at any age and may involve any part of the body, but 90% occur in children less than 2 years of age and involve the head and neck. These malformations are either congenital or acquired. Congenital lymphangiomas are often associated with chromosomal abnormalities such as Turner syndrome, although they can also exist in isolation. Lymphangiomas are commonly diagnosed before birth using fetal ultrasonography. Acquired lymphangiomas may result from trauma, inflammation, or lymphatic obstruction.

Most lymphangiomas are benign lesions that result only in a soft, slow-growing, "doughy" mass. Since they have no chance of becoming malignant, lymphangiomas are usually treated for cosmetic reasons only. Rarely, impingement upon critical organs may result in complications, such as respiratory distress when a lymphangioma compresses the airway. Treatment includes aspiration, surgical excision, laser and radiofrequency ablation, and sclerotherapy.

Classification

Cavernous lymphangioma, H&E stain. Irregular, dilated spaces are visible in dermis.

Lymphangiomas have traditionally been classified into three subtypes: capillary and cavernous lymphangiomas and cystic hygroma. This classification is based on their microscopic characteristics. A fourth subtype, the hemangiolymphangioma is also recognized.

Capillary lymphangiomas

Capillary lymphangiomas are composed of small, capillary-sized lymphatic vessels and are characteristically located in the epidermis.

Cavernous lymphangiomas

Composed of dilated lymphatic channels, cavernous lymphangiomas characteristically invade surrounding tissues.

Cystic hygromas

Cystic hygromas are large, macrocystic lymphangiomas filled with straw-colored, protein-rich fluid.

Hemangiolymphangioma

As suggested by their name, hemangiolymphangiomas are lymphangiomas with a vascular component.

Lymphangiomas may also be classified into microcystic, macrocystic, and mixed subtypes, according to the size of their cysts.

Microcystic lymphangiomas

Microcystic lymphangiomas are composed of cysts, each of which measures less than 2 cm³ in volume.

Macrocystic lymphangiomas

Macrocystic lymphangiomas contain cysts measuring more than 2 cm³ in volume.

Mixed lymphangiomas

Lymphangiomas of the mixed type contain both microcystic and macrocystic components.

Finally, lymphangiomas may be described in stages, which vary by location and extent of disease. In particular, stage depends on whether lymphangiomas are present above or superior to the hyoid bone (suprahyoid), below or inferior to the hyoid bone (infrahyoid), and whether the lymphangiomas are on one side of the body (unilateral) or both (bilateral).

Stage I

Unilateral infrahyoid.

Stage II

Unilateral suprahyoid.

Stage III

Unilateral suprahyoid and infrahyoid.

Stage IV

Bilateral suprahyoid.

Stage V

Bilateral suprahyoid and infrahyoid.

Signs and symptoms

There are three distinct types of lymphangioma, each with their own symptoms. They are distinguished by the depth and the size of abnormal lymph vessels, but all involve a malformation of the lymphic system. Lymphangioma circumscriptum can be found on the skin's surface, and the other two types of lymphangiomas occur deeper under the skin.

• Lymphangioma circumscriptum, a microcystic lymphatic malformation, resembles clusters of small blisters ranging in color from pink to dark red. They are benign and do not require medical treatment, although some patients may choose to have them surgically removed for cosmetic reasons.
• Cavernous lymphangiomas are generally present at birth, but may appear later in the child's life. These bulging masses occur deep under the skin, typically on the neck, tongue and lips, and vary widely in size, ranging from as small as a centimeter in diameter to several centimeters wide. In some cases, they may affect an entire extremity such as a hand or foot. Although they are usually painless, the patient may feel mild pain when pressure is exerted on the area. They come in the colors white, pink, red, blue, purple, and black; and the pain lessens the lighter the color of the bump.
• Cystic hygroma shares many commonalities with cavernous lymphangiomas, and some doctors consider them to be too similar to merit separate categories. However, cystic lymphangiomas usually have a softer consistency than cavernous lymphangiomas, and this term is typically the one that is applied to lymphangiomas that develop in fetuses. They usually appear on the neck (75%), arm pit or groin areas. They often look like swollen bulges underneath the skin.

Causes

The direct cause of lymphangioma is a blockage of the lymphatic system as a fetus develops, although symptoms may not become visible until after the baby is born. This blockage is thought to be caused by a number of factors, including maternal alcohol use and viral infections during pregnancy. Why the embryonic lymph sacs remain disconnected from the rest of the lymphatic system is not known.

Cystic lymphangioma that emerges during the first two trimesters of pregnancy is associated with genetic disorders such as Noonan syndrome and trisomies 13, 18, and 21. Chromosomal aneuploidy such as Turner syndrome or Down syndrome were found in 40% of patients with cystic hygroma.

Pathophysiology

Proliferating lymphangioma, H&E stain. Sometimes endothelial cells begin to divide excessively.

In 1976, Whimster studied the pathogenesis of lymphangioma circumscriptum, finding lymphatic cisterns in the deep subcutaneous plane are separated from the normal network of lymph vessels. They communicate with the superficial lymph vesicles through vertical, dilated lymph channels. Whimster theorized the cisterns might come from a primitive lymph sac that failed to connect with the rest of the lymphatic system during embryonic development.

A thick coat of muscle fibers that cause rhythmic contractions line the sequestered primitive sacs. Rhythmic contractions increase the intramural pressure, causing dilated channels to come from the walls of the cisterns toward the skin. He suggested that the vesicles seen in lymphangioma circumscriptum are outpouchings of these dilated projecting vessels. Lymphatic and radiographic studies support Whimsters observations. Such studies reveal that big cisterns extend deeply into the skin and beyond the clinical lesions. Lymphangiomas that are deep in the dermis show no evidence of communication with the regular lymphatics. The cause for the failure of lymph sacs to connect with the lymphatic system is not known.

Microscopically, the vesicles in lymphangioma circumscriptum are greatly dilated lymph channels that cause the papillary dermis to expand. They may be associated with acanthosis and hyperkeratosis. There are many channels in the upper dermis which often extend to the subcutis (the deeper layer of the dermis, containing mostly fat and connective tissue). The deeper vessels have large calibers with thick walls which contain smooth muscle. The lumen is filled with lymphatic fluid, but often contains red blood cells, lymphocytes, macrophages, and neutrophils. The channels are lined with flat endothelial cells. The interstitium has many lymphoid cells and shows evidence of fibroplasia (the formation of fibrous tissue). Nodules (A small mass of tissue or aggregation of cells) in cavernous lymphangioma are large, irregular channels in the reticular dermis and subcutaneous tissue that are lined by a single layer of endothelial cells. Also an incomplete layer of smooth muscle also lines the walls of these channels. The stroma consists of loose connective tissue with a lot of inflammatory cells. These tumors usually penetrate muscle. Cystic hygroma is indistinguishable from cavernous lymphangiomas on histology.

The typical history of Lymphangioma circumscriptum shows a small number of vesicles on the skin at birth or shortly after. In subsequent years, they tend to increase in number, and the area of skin involved continues to expand. Vesicles or other skin abnormalities may not be noticed until several years after birth. Usually, lesions are asymptomatic or do not show any evidence of a disease, but, mostly, patients may have random break outs of some bleeding and major drainage of clear fluid from ruptured vesicles.

Cavernous lymphangioma first appears during infancy, when a rubbery nodule with no skin changes becomes obvious in the face, trunk, or extremity. These lesions often grow at a rapid pace, similar to that of raised hemangiomas. No family history of prior lymphangiomas is described.

Cystic hygroma causes deep subcutaneous cystic swelling, usually in the axilla, base of the neck, or groin, and is typically noticed soon after birth. If the lesions are drained, they will rapidly fill back up with fluid. The lesions will grow and increase to a larger size if they are not completely removed in surgery.

Diagnosis

Cases of lymphangioma are diagnosed by histopathologic inspection. In prenatal cases, cystic lymphangioma is diagnosed using an ultrasound; when confirmed amniocentesis may be recommended to check for associated genetic disorders.

Treatment

Treatment for cystic hygroma involves the removal of the abnormal tissue; however complete removal may be impossible without removing other normal areas. Surgical removal of the tumor is the typical treatment provided, with the understanding that additional removal procedures will most likely be required as the lymphangioma grows. Most patients need at least two procedures done for the removal process to be achieved. Recurrence is possible but unlikely for those lesions able to be removed completely via excisional surgery. Radiotherapy and chemical cauteries are not as effective with the lymphangioma than they are with the hemangioma. Draining lymphangiomas of fluid provides only temporary relief, so they are removed surgically. Cystic Hygroma can be treated with OK432 (Picibanil).

The least invasive and most effective form of treatment is now performed by interventional radiologists. A sclerosing agent, such as 1% or 3% sodium tetradecyl sulfate, doxycycline, or ethanol, may be directly injected into a lymphocele. "All sclerosing agents are thought to work by ablating the endothelial cells of the disrupted lymphatics feeding into the lymphocele."

Lymphangioma circumscription can be healed when treated with a flashlamp pulsed dye laser, although this can cause port-wine stains and other vascular lesions.

Prognosis

The prognosis for lymphangioma circumscriptum and cavernous lymphangioma is generally excellent. This condition is associated with minor bleeding, recurrent cellulitis, and lymph fluid leakage. Two cases of lymphangiosarcoma arising from lymphangioma circumscriptum have been reported; however, in both of the patients, the preexisting lesion was exposed to extensive radiation therapy.

In cystic hygroma, large cysts can cause dysphagia, respiratory problems, and serious infection if they involve the neck. Patients with cystic hygroma should receive cytogenetic analysis to determine if they have chromosomal abnormalities, and parents should receive genetic counseling because this condition can recur in subsequent pregnancies.

Complications after surgical removal of cystic hygroma include damage to the structures in the neck, infection, and return of the cystic hygroma.

Epidemiology

Lymphangiomas are rare, accounting for 4% of all vascular tumors in children. Although lymphangioma can become evident at any age, 50% are seen at birth, and 90% of lymphangiomas are evident by 2 years of age.

History

In 1828, Redenbacher first described a lymphangioma lesion. In 1843, Wernher gave the first case report of a cystic hygroma, from the Greek "hygro-" meaning fluid and "oma" meaning tumor. In 1965, Bill and Summer proposed that Cystic hygromas and lymphangiomas are variations of a single entity and that its location determines its classification.

References

External links

• USC
• Cystic hygroma at eMedicine
• Lymphatic Research Foundation:

UpToDate Contents

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• 1. 小児における口腔軟部組織病変 soft tissue lesions of the oral cavity in children
• 2. 食道の良性病変 benign lesions of the esophagus
• 3. 小児における鼠径部腫脹の評価 evaluation of inguinal swelling in children
• 4. 下顎、口、口腔、および咽頭の先天異常 congenital anomalies of the jaw mouth oral cavity and pharynx
• 5. 新生児の評価 assessment of the newborn infant

English Journal

• Intraoral Ultrasonography to Tongue Mass Lesions.

• Sugawara C1, Takahashi A2, Kawano F1, Kudo Y3, Ishimaru N3, Miyamoto Y2.
• Dento maxillo facial radiology.Dentomaxillofac Radiol.2016 Feb 26:20150362. [Epub ahead of print]
• OBJECTIVES: To demonstrate the usefulness of intraoral ultrasonography (IOUS) for tongue mass lesions, we analyzed surgery cases excluding squamous cell carcinoma (SCC) and leukoplakia and compared IOUS findings and pathological findings.METHOD: We used the Hospital Information System (HIS) and Radi
• PMID 26915405

• [Vulvar lymphangioma circumscriptum following pelvic radiotherapy].

• Ramli I1, Ismaili N2, Amarouch H2, Senouci K2, Hassam B2.
• Presse medicale (Paris, France : 1983).Presse Med.2016 Feb 5. pii: S0755-4982(16)00003-8. doi: 10.1016/j.lpm.2015.12.012. [Epub ahead of print]
• PMID 26857082

• Drop-Attacks Revealing a Cervical Cystic Lymphangioma.

• Lyazidi Y1, Bakkali T2, Zoulati M2, Chtata H2, Taberkant M2.
• Annals of vascular surgery.Ann Vasc Surg.2016 Feb;31:208.e5-7. doi: 10.1016/j.avsg.2015.09.011. Epub 2015 Nov 25.
• We report the case of a 28-year-old man who presented in emergency for recurrent drop-attacks. Ultrasound imaging and angio computed tomography revealed a left cervical tumor, and the patient underwent surgery. The diagnosis of cystic lymphangioma was done on the anatomic characteristics of the surg
• PMID 26620381

Japanese Journal

• 症例報告 四肢,体幹の血管奇形(脈管性腫瘤)に対する多期手術の経験

• 藤野 順子,石丸 由紀,田原 和典 [他]
• 日本小児外科学会雑誌 47(2), 261-268, 2011-04
• NAID 40018816507

• 学術展示 小児眼窩リンパ管腫の2例 (第35回日本小児眼科学会(1))

• 太田 みずほ,神部 友香,栗原 淳 [他]
• 眼科臨床紀要 4(4), 373-377, 2011
• NAID 40018812504

Related Links

• トップページ｜リンパ管疾患情報ステーション

このホームページの目的 1．「リンパ管腫」に関する国内外のあらゆる情報を集めて整理し、患者さん及び医療者に正確に提示すること 2．収集した情報を通じて「リンパ管腫」を正確に理解し、より良い治療法を探し出すこと

• リンパ管腫とは｜リンパ管疾患情報ステーション

概要 リンパ管腫は大小様々の水風船のような「嚢胞」が集まって塊をつくっている病変です。嚢胞はリンパ管が異常に膨らんで袋状になったもので、中身はリンパ液が主体です。リンパ管腫はリンパ管という全身をめぐるリンパ液を流す管の ...

Related Pictures

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★リンクテーブル★

リンク元

「リンパ管腫」

「リンパ管腫」

　　[★]

英

lymphangioma

関

嚢胞状リンパ管腫

概念

• リンパ管の過誤腫的な先天異常、リンパ液の持続的うっ滞、腫瘍性の増殖などによって生じる疾患

• リンパ管の腫瘍的増殖ではなく先天的なリンパ管の奇形という理解になっている。

分類

• 後天性リンパ管腫
• 海綿状リンパ管腫
• 限局性リンパ管腫
• 嚢腫状リンパ管腫

治療

• 外科的切除