Basilar Impression and Invagination
Fig. 71.1 Basilar impression/invagination. (a) Sagittal T1-weighted precontrast MR image. (b) Sagittal CT image. The clivus is hypoplastic, and there is incomplete segmentation of C2 and C3. The odontoid process…
NEUROSURGERY
Pituitary Hyperplasia
Fig. 9.1 (a) Sagittal T1-weighted image post gadolinium contrast enhancement. (b) Coronal T1-weighted image post gadolinium contrast enhancement. The pituitary gland exhibits homogeneous enhancement with a convex upper margin and…
Duplication of the Pituitary Gland
Fig. 69.1 Duplication of the pituitary gland. (a) Sagittal T1-weighted MR scan shows hypothalamic thickening (arrow). (b) Coronal T1-weighted MR scan shows two separate anterior and posterior pituitary glands with…
Juvenile Nasopharyngeal Angiofibroma (JNA)
Fig. 49.1 Juvenile nasopharyngeal angiofibroma (JNA). (a) Sagittal contrast-enhanced CT image. (b) Axial contrast-enhanced CT image. (c) Coronal contrast-enhanced CT image. (d) Sagittal precontrast T1-weighted MR image. (e) Axial T1-weighted…
Hypothalamic Hamartoma
Fig. 39.1 Hypothalamic hamartoma. (a) Sagittal T1-weighted pre-gadolinium MR image. (b) Coronal T1-weighted pre-gadolinium image. A well-circumscribed mass with slight T1 hyperintensity (arrow) is seen in the suprasellar region posterior…
Persistent Trigeminal Artery of the Sellar Region
Fig. 65.1 Persistent trigeminal artery (PTA) extending through the sella turcica and pituitary gland. (a) Axial noncontrast MRI showing a flow void through the dorsum sellae (arrow) arising from the…
Sinonasal Undifferentiated Carcinoma (SNUC)
Fig. 47.1 Sinonasal undifferentiated carcinoma (SNUC). (a) Sagittal T1-weighted gadolinium-enhanced MR image. (b) Coronal T1-weighted gadolinium-enhanced image. A large, heterogeneously enhancing mass involves the nasal cavity and ethmoid and sphenoid…
Sheehan’s Pituitary Infarction
Fig. 64.1 Sheehan’s infarction. (a) Sagittal T1-weighted precontrast MR image. (b) Coronal T1-weighted gadolinium-enhanced image. (c) Sagittal T1-weighted precontrast image. (d) Sagittal T1-weighted gadolinium-enhanced image. The pituitary gland is markedly…
Sinonasal Melanoma
Fig. 45.1 Sinus malignancy: melanoma. (a) Sagittal CT image with contrast enhancement. (b) Sagittal T1-weighted gadolinium-enhanced MR image. (c) Coronal T1-weighted gadolinium-enhanced image. A heterogeneously enhancing mass is centered in…
Arteriovenous Malformations
Fig. 60.1 Arteriovenous malformation (AVM) of the parasellar region. (a) Axial T2-weighted MR image. (b) Coronal contrast-enhanced CT image. Multiple tangles of the arteries and veins are present in the…
