Differentials

Question 1

Differential for this?

Answer 1

Arachnoid diverticulum or cyst

Stenotic lateral apertures of the fourth ventricle

Obstruction by a non-contrast enhancing lesion (inflammatory, neoplasia, cholesterol granuloma

Question 2

Differentials for cyst like lesion in the brain?

Answer 2

1. Cyst
2. Diverticulum
3. Neoplasia (Glioma, meningoma)
4. Hydatid cysts
5. Abscess
6. Reduction in brain size (Dandy-Walker syndrom)
7. Porencephaly from previous trauma, infarct or surgery

Question 3

Differentials for a mass in the sella turcica or suprasellar?

Answer 3

1. Macroadenoma
2. Adenocarcinoma
3. Meningioma
4. Lymphoma
5. Granular cell tumor
6. Gliomatosis cerebri
7. Craniopharyngiomas

Question 4

Diffs for hypercalcemia?

Answer 4

1. Hyperparathyroid
2. Addison’s
3. Cancer
4. Renal disease

Question 5

Diffs for a reduction in luminal size of the proximal urethra?

Answer 5

1. Stricture
2. Urethral spasm
3. Inflammation
4. Torsion