CT

Staging of colorectal cancer

TNM classification of colorectal cancer

T Primary tumor
Tx Primary tumor cannot be assessed
T0 No evidence of primary tumor
Tis Carcinoma in situ: invasion up to lamina propria mucosae
T1 Tumor invades submucosa
T2

Malrotation of the gut

During development, the bowel rotates 270° anticlockwise in two locations: the foregut and midgut junction (duodenum) and midgut-hindgut location (cecum), so that the ligament of Treitz is located left to the midline and cecum reaches the right iliac fossa. Completeness of rotation can be classified into four cathegories:

Cathegory Description
Normal rotation Normal appearance of the gut, cecum in the right iliac fossa and the ligament of Treitz left to the midline

Subependymal hemorrhage (SEH) into germinal matrix

Subependymal hemorrhage or germinal matrix hemorrhage occurs in premature infants with very low birth weight (<1500g). The germinal matrix in the immature brain is located around the lateral ventricles and it contains a fine network of fragile blood vessels, which are sensitive to ischemia and changes in perfusion pressure. Subependymal hemorrhage in premature neonates can be easily assessed by ultrasound and be divided into four grades.
 

Grade Description
Grade I hemorrhage confined to the germinal matrix
Grade II intraventricular hemorrhage (hemocephalus) without ventricular dilation
Grade III intraventricular hemorrhage (hemocephalus) with ventricular dilation
Grade IV intraventricular rupture with hemorrhage into the surrounding white matter

References:

1. Bowerman R, Donn S, Silver T, Jaffe M. Natural history of neonatal periventricular/intraventricular hemorrhage and its complications: sonographic observations. American Journal of Roentgenology. 1984 Nov 1;143(5):1041–52.
2. Radack DM, Baumgart S, Gross GW. Subependymal (grade 1) intracranial hemorrhage in neonates on extracorporeal membrane oxygenation. Frequency and patterns of evolution. Clin Pediatr (Phila). 1994 Oct;33(10):583–7.

3. Smith WL, McGuinness G, Cavanaugh D, Courtney S. Ultrasound screening of premature infants: longitudinal follow-up of intracranial hemorrhage. Radiology. 1983 May 1;147(2):445–8.

Estimate of spleen volume on CT or MRI, splenic index - calculator

This formula can be used to estimate volume of the spleen on crossectional imaging methods by measuring three dimensions - caudocranial (L), maximum size in axial plane (D), and maximum thickness in axial plane (T).

Splenic index = L x D x T
A normal value is considered ≤480.

Volume [mL] = 30 + 0.58 x L x D x T
A normal value is considered between 110 and 340mL

Sternoclavicular joint injury - Allman classification

Posttraumatic instability of the sternoclavicular joint is a result of injury to the joint capsule, the sternoclavicular or costoclavicular ligament.

Grade Description
Grade I sprain of the sternoclaviular joint without laxity and minimum pain
Grade II rupture of the sternoclavicular ligaments without rupture of the costoclavicular ligament
Grade III

Perilunate instability - Mayfield classification of carpal instability

Mayfield et al. described in 1980 the following four stages of progressive carpal instability.

Stage Description
Stage I scapholunate dissociation: dorsal dislocation of the proximal scaphoid pole in the radiocarpal joint (rotatory subluxation of the scaphoid) with disruption of the dorsal scapholunate ligament leads to widened scapholunate distance (Terry Tomas sign) on radiograph
Stage II

Posterior dislocation of the hip - Thompson-Epstein classification

Thompson-Epstein classification describes five types of posterior hip dislocation defined by associated acetabular fracture or fracture of the femoral head as depicted on plain radiographs. In general, there are three types of dislocations in the hip joint:

  • posterior: the femoral head is dislocated posteriorly, most commont type
  • anterior: the femoral head is dislocated anteriorly
  • central: impact of the femoral through the acetabular floor into the pelvis

Dislocation in acromioclavicular joint - Rockwood classification of AC dislocation

Rockwood classification divides dislocations in AC joint into six grades. It is an extension of the previous classification by Tossy et al. Normal width of AC joint is considered 1-3mm, widened AC joint has >7mm in men or >6mm in women.

Grade Description
Grade I sprain of the acromioclavicular (AC) ligaments
Grade II complete rupture of the AC ligaments
Grade III

Dislocation in acromioclavicular joint - Tossy classification of AC dislocation

Tossy classification divides dislocations in AC joint into three grades. It was later extended by Rockwood et al. by another three types. Normal width of AC joint is considered 1-3mm, widened AC joint has >7mm in men or >6mm in women.

Grade Description
Grade I no deformity visible on x-ray - strain and contusion of the AC joint
Grade II

Lesion of labrum glenoidale - Snyder classification of labral lesions (SLAP)

The classification of lesions of labrum glenoidale was published by Snyder et al. and had originally four types. Later, several authors added descriptions of other labral lesions.

Type Description
Type I fraying
Type II tear with biceps extension
Type III bucket-handle tear with intact biceps
Type IV bucket-handle tear with biceps extension
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