MR imaging, with its unique ability to delineate the various phases of hemorrhage, is well suited to the evaluation of subdural hemorrhage. At surgery, clear fluid under pressure was found. 2. Subdural hematoma and hygroma are rare complications of spinal anesthesia. The Pathogenesis of Subdural Hygromas: An Ongoing Odyssey. Subdural Hygroma in Infants. Post-traumatic subdural hygroma it is an intracranial lesion, commonly misdiagnosed due to its unclear symptomatology and slow progression. Cerebral atrophy enables minor stress or trauma to provoke separation of the dura–arachnoid interface, as is also seen with subdural hygroma . When a subdural hygroma is seen in infants and children it is often after they have had an infection but it could also be from a minor head injury from falling, hitting their head, or even child abuse. Subdural hygromas are the collections of clear fluid containing mostly CSF. Objective: Brain atrophy and subdural hygroma were well known factors that enlarge the subdural space, which induced formation of chronic subdural hematoma (CSDH). 33,42,43,57 ⇓ ⇓ –60 Unfortunately, the causes of SDHys cannot always be read directly from the CT or MR images. Approximately one-third of patients with CSDH have a history of minor trauma, and risk factors other than brain atrophy and subdural hygroma are old age, chronic alcohol addiction, blood coagulation disorders, anticoagulant use, and epilepsy. However, they should be considered in patients after spinal anesthesia with continuing orthostatic headache, especially if contributing factors are present, such as a ventriculo-peritoneal shunt or brain atrophy … Key Words: Magnetic resonance imaging․Subdural hygroma․Atrophy․Subarachnoid space․Diagnosis INTRODUCTION Extracerebral or pericerebral fluid collection includes subdural hygroma17,25,26), subdural effusion10,12,18), enlargement of the subara- Symptoms. They accumulate in the subdural space around the convexity of the brain – normally a … Conclusion: The cortical vein sign is not useful to differentiate subdural hygroma and atrophy. What symptoms a person has with a general hygroma … For different authors subdural hygroma is more prevalent in older patients with some degree of cerebral atrophy 4,9,14,19. Among neurotraumatologists it is generally known that SDHys usually derive from head injuries and represent rare posttraumatic complications that may coexist with epidural or subdural hematomas. In our study, 50% of our traumatic subudural hygroma patients were between 16 and 40 years; this characterizes a younger and prevalent population. Cat and dog models suggest that, once the dura and arachnoid separate, fibrin, from either serum or exudates, can induce proliferation of granulation tissue on the inner dural surface [ 19 ]. Acute CSF subdural hygromas had signal intensities identical to CSF without MR evidence of blood products. 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