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What is arachnoid cyst with resolved intracystic hemorrhage?
Arachnoid cyst with resolved intracystic hemorrhage is noted in the left cranial fossa with CSF density. Arachnoid cysts are benign lesions that are formed between the inner and outer layers of the arachnoid, and they account for 1% of all intracranial space-occupying lesions.

Why are hemorrhagic cysts difficult to differentiate from neoplasm?
Some pa-tients are unable to receive IV contrast agents because of contrast material allergy or de-creased kidney function. In these cases, without the aid of contrast enhancement, differentiating hemorrhagic cysts from neoplasm can be diffi-cult as both can appear hyperintense on T1-weighted imaging.

Can hemorrhagic renal cysts be differentiated from RCCs without contrast enhancement?
The differentiation of hemorrhagic renal cysts from RCCs without the aid of contrast enhancement was initially established on CT. Studies have established a high speci-ficity for hemorrhagic renal cysts in lesions that are above 70 HU and homogeneous by subjective evaluation [6, 7].

Are hyperintense hemorrhagic renal cysts benign?
Although these studies [8–10] have differed slightly in their methods, they agree that ho-mogeneous lesions that are hyperintense on T1-weighted imaging, either based on subjec-tive assessment or values standardized to the psoas muscle, are more likely to be hemor-rhagic renal cysts and, therefore, benign.

[PDF File]Retroperitoneal cyst hemorrhage in polycystic kidney disease
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FIGURE 1. Computed tomography reveals acute hemor- rhagic rupture of a cyst in the left kidney into the retro- peritoneal space (arrows). 59-year-old man with autosomal domi- nant polycystic kidney disease (ADPKD), end-stage renal disease on hemodialysis, hy- pertension, and diverticulosis presented with acute pain in the left lower abdomen.

Are Hemorrhagic Cysts Hyperintense Enough on T1 ... - AJR
papillary RCCs, 59 hemorrhagic renal cysts, and 54 simple cysts were retrospectively analyzed. Patient demographics are provided in Table 1. The types of cysts (hemorrhagic renal cysts and simple cysts) were identified as described in the radiology report and confirmed on the basis of their lack of enhance - ment.

[PDF File]Managing Incidental Findings on Abdominal and Pelvic CT and ...
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luteum can form a cyst larger than the dominant follicle from which it arose. That cyst may be simple or hemor-rhagic, often with a peripheral rim of hypervascularity, readily demonstrable with Doppler and contrast-en-hanced CT. This has been called the “hyperenhancing 676 Journal of the American College of Radiology/Vol. 10 No. 9 September 2013

Cystic Lesions of the Pancreas - AJR
Pancreatic cysts can be morphologically classified into four categories: 1. Unilocular cysts (cysts without septation or a solid component)—pancreatic pseudocyst, intra - ductal papillary mucinous neoplasm (IPMN) and mucinous cystadenoma.

Intracystic Hemorrhage of an Arachnoid Cyst: a Case with ...
Arachnoid cysts are benign lesions that are formed between the inner and outer layers of the arachnoid, and they account for 1% of all intracranial space-occupying lesions. Usually, arachnoid cysts are asymptomatic. However, they can be symptomatic in case of complication, such as intracystic hemorrhage or acute cyst expansion (1).

O-RADS US Risk Stratification and Management System: A ...
hemorrhagic cysts, dermoid cysts, endometriomas, paraovarian cysts, peritoneal inclusion cysts, hydrosalpinges, and O-RADS US working group consensus, we offer guidelines for manage-ment in the different risk categories. The proposed guidelines are a collaborative, multidisciplinary, international approach in-

Radiopaedia hemorrhagic cyst