What do you see in the following images?
Polymicrogyria
Bilateral cortical thickening with numerous small gyri with signal characteristics similar to normal grey matter.
Dilated bilateral perivascular spaces in the subjacent white matter.
86-year-old patient:
– With sudden collapse
– Patient known with infrarenal aortic aneurysm
– Sudden collapse at home
– Transfer to the hospital with ambulance
Axial and coronal slices of an abdominal CT in 2019 show a tortuous abdominal aorta with aneurysmal dilatations and eccentric thrombus. There is a thrombosed saccular component at the level of the aortic bifurcation (arrow)
CT at presentation:
– Ruptured aortic aneurysm
* known infrarenal aortic aneurysm
* massive retroperitoneal hematoma extending into the posterior pararenal and perirenal compartments
* active contrast extravasation
– Point of weakness: saccular aneurysmal component
– This case did not show a classic sign of pending rupture; however, a clear point of weakness was retrospectively identified (the saccular aneurysmal component at the aortic bifurcation)
– Radiological signs of pending rupture:
* !! High attenuating crescent (= acute haematoma within the mural thrombus or aneurysmal wall)
* Focal discontinuity of intimal calcification and ‘tangential calcium sign’
* ‘Draped aorta sign’, present when
* The posterior aortic wall is unidentifiable as a distinct line
* The posterior aorta follows the contour of the spine on one or both sides
– Reference: CT signs of pending aortic aneurysm rupture, J.P. Heiken, radiologyassistant.nl
https://radiologyassistant.nl/abdomen/aorta/aneurysm-rupture
What do you see in the following images?
Nasolabial cyst
Right nasolabial lesion with remodeling of the maxillary alveolus bone. On MRI it shows high signal intensity on both T1- and T2-weighted images with no signal suppression on the T2 FLAIR with Fat saturation sequence.
Differential Diagnosis:
Nasolabial cyst with hemorrhage
Epidermal inclusion cyst
Dermoid cyst
Dentigerous cyst
61-year-old female:
– With elevated ALT, AST, and bilirubin
Wall thickening and enhancement of the gallbladder wall
Mild common bile and intrahepatic duct dilatation
Filling defect within the distal common bile duct
Choledocholithiasis
53-year-old male:
– Persistent right shoulder pain, no movement limitations.
– No previous trauma.
– Shoulder MRI is performed
What do you see?
Quadrangular/Quadrilateral space syndrome
– Posteroinferior paralabral cyst (arrow) extending into the quadrangular space
– Teres minor mild fatty infiltration – atrophy (circle)
– Neurovascular compression syndrome of the posterior humeral circumflex artery (PHCA) and/or the axillary nerve or one of its major branches in the quadrangular space
– Multiple causes of compression: fibrotic bands, ganglion/cysts, aneurysms, tumours
– MRI may demonstrate atrophy and/or denervation edema of the teres minor and/or deltoid muscles
– Differential diagnosis: Parsonage-Turner sd, disuse atrophy
A 79-year-old female patient:
– Presented with abdominal pain, nausea, vomiting
– Previous history of cholecystitis and pancreatitis
– Laboratory findings:
*Elevated C-reactive protein and white blood cell levels
Pneumobilia (arrow)
Cholecystoduodenal fistula (red arrow)
Gastric (blue arrow) and duodenal (green arrow) distension
Gallstone located in the proximal jejunal segment (red arrows)
Gastric distension (blue arrows)
Gallstone ileus
Abdominal CT images obtained two years earlier show that the gallstone is in the gallbladder (arrows).
* Gallstone ileus is a cause of mechanical small bowel obstruction that generally affects the elderly and has high mortality. It is a rare complication of chronic cholecystitis. It develops when a gallstone passes through a cholecystoenteric fistula leading to small bowel obstruction.
* Gallstones most commonly become impacted in the distal ileum.
* The classical imaging findings on abdominal radiographs form Rigler triad: pneumobilia, small bowel obstruction, and ectopic radio-opaque gallstone
* CT is the most frequently used imaging modality for the diagnosis as it demonstrates the rim-calcified or total-calcified ectopic gallstone, abnormal gallbladder with air collection, presence of air-fluid level, biliary-enteric fistula, and transition point of small bowel obstruction. However, only a minority of gallstones are calcified. Therefore, they may be overlooked in intestinal lumen, which may result in misdiagnosis. Multiplanar reformatted CT images can be helpful to locate the migration site of the ectopic stones.
* Treatment: Surgery with removal of gallbladder stone is the definitive treatment.
In our case, the patient underwent surgery. Enterotomy with gallstone removal was performed. According to the operation note, the gallstone was located in the jejunum 20 cm distal to the ligament of Treitz.
75-year-old female:
– Day 4 post Whipple procedure
– Ongoing abdominal pain with increased inflammatory markers and slightly increased lactate levels
– Post-operative changes following partial pancreatectomy and duodenojejunostomy (partially shown)
– Prominent mesenteric nodes
– Partially occlusive thrombus of the superior mesenteric vein (best seen on axial slice) extending to a large jejunal branch (seen on coronal slice)
Partial SMV occlusion as a complication to recent Whipple procedure
8-year-old patient:
– With a chronically painful right knee and ankle
– Patient with no relevant clinical history
– Parents mention a difficulty when running, the patient trips very easily and sometimes struggles to use the right leg. The right leg is often painful
Showing the X-ray right knee and the pelvis
Eccentric, lytic bone lesions with sharp margins
No periosteal reaction
Ground-glass matrix of the lesion in the right tibial diaphysis
Soap-bubbly appearance of the lesion in the femoral diaphysis
Expansile bone lesion with ground glass matrix in the right femoral neck, extending into the proximal diaphysis
Slight varus deformity of the femoral neck
Similar lesion in the right iliac wing/acetabular region
A CT was performed:
Showing X-ray of both feet.
Expansile bone lesion with ground glass matrix involving the 1st metatarsal and proximal and distal phalanges of the left foot
Soap-bubbly lesions of the talus and 5th metatarsal
– Multiple bone lesions with benign appearance
– Expansile lesion with ground-glass matrix in the femoral neck virtually pathognomonic for fibrous dysplasia
– Genetic testing could not reveal mutations of the GNAS gene: no syndromic association in this patient
Benign bone lesions
– Usually central in bone
– Varying degrees of expansion
– Ground-glass matrix (mildly sclerotic)
– Lack of aggressive features (no periosteal reaction, no cortical breakthrough or soft tissue mass)
Aetiology: developmental dysplasia
Fibrous dysplasia is polyostotic in 15–20%, often in syndromic association (mutations of the GNAS gene)
– McCune-Albright syndrome (in combination with endocrine dysfunctions)
– Mazabraud syndrome
Known patient with recently diagnosed poorly differentiated vaginal carcinoma with staging FDG PET/CT study. What is the study showing?
– A hypermetabolic lower vaginal lesion representing the known vaginal neoplasm associated with a larger hypermetabolic uterine body neoplastic lesion suggesting synchronous malignant process
– Multiple hypermetabolic enumerable bilateral lung deposits associated with a single right lower para-tracheal nodal deposit
Ossification of the membranous labyrinth, high-density bone deposition involving all the cochlear turns.
This usually occurs as a complication of suppurative labyrinthitis, either due to otomastoiditis or meningitis. Other causes include trauma, autoimmune diseases, and surgery.
