HO

Question 1

Target pretransfusion hemoglobin level in thalassemia

Answer 1

9.5-10.5 g/dL

Question 2

Hemophilia severity, based on percent activity:
mild
moderate
severe

Answer 2

mild - <1%
modrate - 1-5%
severe - >5%

35-50% is hemostatic range

Question 3

Solid, homogeneous contrast medium-enhancing mass in the posterior fossa
Small, blue, round cells
Homer Wright rosettes
Immunopositive for synaptophysin

Answer 3

Medulloblastoma

Question 4

Well-circumscribed tumor with variable and complex patterns of gadolinium enhancement
Perivascular pseudorosettes, ependymal rosettes, monomorphic nuclear morphology, nonpalisading foci of necrosis

Answer 4

Ependymal tumors

Question 5

Most common astrocytoma in children

Rosenthal fibers

Answer 5

Pilocytic astrocytoma