Apple core lesion

Various Appearance of Portal Hypertension ~ To be continued

Spenoadrenorenal shunt

MRI feature of white matter disease

Brain atrophy
Involved symmetericity
Myelin abnormality
Brainstem & cerebellar involvement
Contrast enhancement
Malformation
Dynamic imaging pattern

Pseudomyxoma peritonei

Ruptured mucocele with foreign body peritonitis
Male: cystadenocarcinoma of appendix
Female: cystadenocarcinoma of ovary

*Thickening of peritoneal + omental sufaces
*Omental cake
*Posterior fixation of bowel loops and mesentery
*Voluminous septated/loculated pseudoascites
*Several thin-walled cystic masses of different size throughout abdominal cavity
*Scalloped contour of liver and splenic margins
Annular / semicircular calcifications

GIST

Esophageal GIST

Gastric GIST

Hiatal hernia

Sliding hernia (axial type): 95%
- GEJ is aboe the diaphragm
- Reflux is more likely with larger hernias
- May be reducible in erect position
Paraesophageal hernia
- GEJ is in its normal position
- Part of the fundus is herniated above the diaphragm through esophageal hiatus and lies to the side of the esophagus
- Not reflux
- More prone to mechanical complications
- Usually nonreducible

*Gastric folds aboe diaphragm
*B line above diaphragm
*Schatzki's ring above diaphragm

%Esophagitis
%Duodenal ulcers

Sign of Intraperitoneal Free Air

Rigler's sign
Triangle sign
Falciform ligament sign
Inverted V sign
Urachus sign
Hyperlucent liver sign
Hepatic age som
Doge cape sign
Anterior superior oal sign
Foot ball sign
Dolphin sign

Gastric Volvulus

Gastric volvulus
- Mesenteroaxial type: from lesser to greater curve
- Organoaxial type: from cardia to pylorus
Cause
- Diaphragmatic defect
- Intestinal malrotation
- Wandering spleen
-Absence of gastrophrenic ligament and gastrosplenic ligament
Resolve spontaneously sometimes.

*Organoaxial vovulus*

Juxtapapillary diverticula

Typical aging change of pancreas

ICH in MRI appearance

T1WI
Hyperacute (intracellular oxy-Hgb): Isointense
Acute (intracelluar deoxy-Hgb): Isointense
Subacute-early (intracellular met-Hgb): Hyperintense
Subacute-late (extracelluar met-Hgb): Hyperintense
Chronic-early (extraelluar met-Hgb & ferritin/hemosiderin wall): Hyperintense
Chronic-late (hemosiderin): Isointense
T2WI
Hyperacute (intracellular oxy-Hgb): Hyperintense with/without hypointense rim
Acute (intracelluar deoxy-Hgb): Hypointense
Subacute-early (intracellular met-Hgb): Hypointense
Subacute-late (extracelluar met-Hgb): HyperHyperintense
Chronic-early (extraelluar met-Hgb & ferritin/hemosiderin wall): Hyperintense with pronounced low signal rim
Chronic-late (hemosiderin): Hypointense
T2*GRE
All hypointense, senseitive to some lesions
DWI
Findings parallel that of convential T2WI
Significant correlation between lesion volume and degree of ADC elevation in perihematoma edema
T1WI with contrast
Ring enhancement appearance in subacute phase

Bone Island

A bone island, also known as an enostosis, is a focus of compact bone located in cancellous bone. This is a benign entity that is usually found incidentally on imaging studies; however, the bone island may mimic a more sinister process, such as an osteoblastic metastasis.
In CT: a round nodule without extension outside the cancellous bone and does not cause bony destruction

Intestinal intussusception

Acute segmental infarction of kidney

Groove pancreatitis

a form of segmental pancreatitis affecting the head of the pancreas, is localized within the "groove" between pancreas head, duodenum, and common bile duct. Differentiation between groove pancreatitis and pancreatic head carcinoma is often difficult.

Impact of protein plug over Santorini's duct may be the cause of groove pancreatitis

Image: a mass was detected in the head of the pancreas that involved the duodenum. Dynamic CT demonstrated a poorly enhancing lesion extending between the pancreatic head and the duodenum.

Bowler Hat Sign

For differienation of polyp and diverticulm of colon.
Bowler hat pointing toward center of cup showed a polyp and pointing away from center of cup showed a diverticulum
When the bowler hat is nearly parallel to long axis of bowel, it is impossible to determine whether it is a polyp or a diverticulum

Metastasis with hepatoduodenal ligament extension

Gastric cancer with hepatic hilum invasion and common hepatic artery encased.

The spreading from hepatoduodenal ligament can be domostrated from this image