endothelial cyst

en·do·the·li·al cyst

a serous cyst whose sac is lined with endothelium.
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defined the following 4 groups of adrenal cystic disease: 45% with endothelial cyst (42% with lymphangioma and 3% with hemangioma), 39% with pseudocyst, 9% with epithelial cyst, and 7% with parasite cyst [1].
Results of Histopathologic Examination of Adrenal Lesions Adenoma Non-functioning benign adenoma 19 Aldosterone secreting adenoma (Conn's Syndrome) 02 Phaeochromocytoma 04 Adrenocortical carcinoma 03 Cysts Epithelial cyst 02 Endothelial cyst 03 Pseudocyst 06 Parasitic cyst 01
endothelial cysts (most common), 45%; epithelial cysts, 9%; pseudocyst/haemorrhagic, 39% and parasitic cysts, 7%.
In this particular case, the adrenal cystic mass could have resulted from (1) the parasitic infection itself affecting a normal gland, (2) secondary cystic degeneration of an infected adenoma, or (3) infection of a primary endothelial cyst.
CT demonstration of a giant adrenal endothelial cyst of the angiomatous subtype.
The most common nonneoplastic adrenal cysts are endothelial cysts, pseudocysts, epithelial cysts, and parasitic cysts (6-7%) [4, 6-8].
The frequency of adrenal cysts seen at autopsy studies range from 0.064% to 0.18%.1-6 Histologically, adrenal cysts have been classified into four groups: 1- Pseudocysts (39%) 2-Parasitic cysts (7%) 3- Epithelial cysts (9%) 4- Endothelial cysts (45%), the latter are subdivided into angiomatous and lymphangiomatous cysts.2-5 Adrenal cystic lymphangiomas are rare benign vascular lesions and are thought to arise from the abnormal development and/or ectasia of lymphatic vessels or from blockage of proximal lymphatics or trauma.2
Endothelial cysts are the most common pathologic subtype of adrenal cyst, accounting for approximately 40% of adrenal cysts.
Although pseudocysts represent the most frequently identified adrenal masses, endothelial cysts are found for up to 45% in autopsy series [1, 6, 8].
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