醫學筆記匯整 ED Notes

Adnexal Masses: US Characterization and Reporting
https://pubs.rsna.org/doi/full/10.1148/radiol.09090552

with a few follicles around the periphery confirms the ovarian origin of the cyst

 Corpus luteum 
 - Thick walled cyst with characteristic "ring of fire" peripheral vascularity.
    usually has a crenulated inner margin and internal echoes, usually avascular centrally
 

 Endometrioma 
 The classical example is a unilocular cyst
 with acoustic enhancement with diffuse homogeneous ground-glass echoes
 as a result of the haemorrhagic debris. This appearance occurs in 50% of cases
 角落有圓圓小小沉澱物
 

 Hemorrhagic Ovarian Cyst 
 - Graafian follicle ruptures 排卵後轉變成 corpus luteum
    裡面血管很多造成 bleeding into the corpus luteum 
- 形成血塊 Retracting clot 會 No flow 

1. Fine reticular pattern : Most common, 
    multiple fine strands of fibrin giving a net-like appearanc

2. Retracting clot appearance :
    The process of clot formation and subsequent retraction within the hemorrhagic ovarian cyst
    results in a triangular and somewhat inhomogenous clot in a part of the cyst
    with serous fluid occupying the remainder of the cyst.

 Ring of fire sign 
 - Peripheral vascularity on colour or pulsed Doppler
 - Corpus luteum cyst (more commonly)
   Ectopic pregnancy