Pediatrics

Question 1

Gracile bones

(NIMROD)

Answer 1

Neurofibromatosis

Immobilization / Paralysis

Muscular dystrophy (polio)

RA

Osteogenesis imperfecta

Dysplasias (Marfan, homocysteinuria)

Question 2

Cystic Posterior Fossa Lesion in Peds

Answer 2

Exactly CSF like:
Mega Cisterna Magna / Arachnoid cyst / Dandy Walker
Trapped 4th ventricle / perivascular space, neuroglial / ependymal cyst.

Not exactly CSF like signal:

Intra axial:
Congenital inclusion cyst (neuroenteric)
Neoplasm (Pilocytic astro, hemangioblastoma, mets)
Infection (Abscess, Cysticercosis-with dot)

Extraaxial:
Congenital inclusion cyst (Epi / dermoid)
Neoplasm (mets, chordoma-highT2, cystic schwanoma)