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Endothelial cyst
- Vascular cyst
- Endothelial lining
- 45% of adrenal cysts
- 2/3 in females
- 8% bilateral
- May have residual adrenocortical tissue in wall
Hemorrhagic cyst
- Pseudocyst
- 39% of adrenal cysts
- Middle-aged women
- Seen in Beckwith-Wiedemann syndrome
- Originally would have been an endothelial cyst, that underwent hemorrhage, and secondary fibrosis or hemosiderin deposition
Parasitic cyst
- Echinococcal
- Asymptomatic
- Imaging types:
- Simple cysts with no internal architecture
- Water lily sign with separation of membrane layers
- Complex internal septa and floating debris
- Solid walls and calcification +
- Solid walls and calcification +++
Epithelial lined cyst
- True cyst
- Rare
- Mesothelial origin
- Retention cysts, embryonal cysts or arise from adenomas
Lymphangioma
- Rare
- Thin walled, smooth with flattened endothelial cells
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