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pilocytic astrocytoma
region, histology, characteristics on imaging (Juvenile) pilocytic astrocytomas usually arise in the ☆cerebellum, brainstem, hypothalamic region, or optic pathways.

Microscopically, pilocytic astrocytomas are well-differentiated neoplasms comprised of ☆spindle cells with hair-like glial processes that are associated with microcysts. These cells are mixed with ☆Rosenthal fibers and granular eosinophilic bodies.

well-demarcated lesion comprised of cystic and solid components (white and red arrows, respectively)
neurology neurosurgery UWorld Mar 7, 2020, 7:55 AM   HirotoShishido

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orbital apex syndrome a collection of cranial nerve deficits associated with a mass lesion near the apex of the orbit of the eye

視神経，動眼神経，滑車神経，三叉神経，外転神経
ophthalmology neurosurgery 国試 Oct 20, 2020, 7:18 AM   HirotoShishido

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layers of scalp skin
connective tissue
(epicranial) aponeurosis (galea aponeurotica)
loose connective tissue
periosteum
neurosurgery Dec 22, 2019, 2:07 AM   HirotoShishido

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Picture CN Ⅴ
nurology neurosurgery Dec 23, 2019, 11:39 PM   HirotoShishido

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main cerebellar fissures primary fissure
horizontal fissure
secondary fissure
posterolateral fissure
neurosurgery Dec 22, 2019, 9:57 AM   HirotoShishido

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blood flow from superior saggital sinus to internal carotid vein superior saggital sinus→ superior anastomotic vein(Trolard vein)→ Sylvian vein→ cavernous sinus→ inferior petrosal sinus→ internal carotid vein
neurology neurosurgery Jul 23, 2019, 7:24 AM   HirotoShishido

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