CT

Hydronephrosis in Infants - SFU grading - Society of Fetal Urology

Hydronephrosis in infants is divided into five grades that were standardized by the Society of Fetal Urology. The grading is usually based on ultrasound, ev. intravenous urography.
 

Grade Description
Grade 0 no splitting of renal sinus
Grade I urine visible in renal pelvis only
Grade II urine fills intrarenal pelvis, extrarenal pelvis, major calyces are dilated

Hydronephrosis - grading of dilatation of hydronephrosis

Hydronephrosis is commonly divided into four grades according to dilation of the pelvicalyceal system and cortical thinning that can be visualised on ultrasound, CT and MRI.
 

Grade Description
Grade I dilation of the renal pelvis without dilatation of the calices
Grade II dilation of the renal pevis and calices, that become convex; no signs of cortical thinning
Grade III

Hounsfield units - scale of HU, CT numbers

The Hounsfield scale of tissue density is based on two values: air as -1000HU (minimum HU value) and water as 0HU. Density of other tissues is related to this range, usually from -1000 to +1000HU (-1024 to 1024 or 3072 depending on the coding of particular vendor). However, the scale by its the definition is open-ended.
 

Matter Density (HU)
Air -1000
Lung parenchyma (inspirium) -850 to -910
Fat

Fracture types of axis, C2 by Effendi, modified by Levine & Edwards

The classification of fractures of axis was introduced by Effendi et al. and later modified by Lewine and Edwards. With further two types added (IA and IIA), the modified classification has five types.

Type Description
Type I fracture of the pedicles, intervertebral disc C2/3 is intact, dislocation ≤3mm without angulation
Type IA fracture lines on each side are not parallel, fracture line may involve foramen transversarium on one side

Fracture of pelvis - Young and Burgess classification of pelvic fractures

The Young-Burgess classification system divides pelvic fracture by the direction of the force involved into three basic types - anteroposterior compression (APC), lateral compression (LC), and vertical shear (VC). First two types have three subgroups with increasing degree of severity of the injury

Type Description
Anterioposterior compression (APC)
APC I diastasis of symphysis <2.5cm
APC II

Fracture of pelvis - Tile classification (original)

The original Tile classification divides pelvic fractures into three basic types according to stability based on the integrity of the posterior sacroiliac complex. It also takes into consideration the force involved. In type A, the fracture does not involve the posterior arch. Type B fracture is a result of rotational forces that cause partial disruption of the posterior sacroiliac complex. Complete disruption of the posterior complex (including the sacrospinous and sacrotuberous ligaments) occurs in type C fractures, that are both rotationally and vertically unstable.

Fracture of pelvis - AO classification - modifed Tile AO Müller classification

The modified Tile AO Müller classification, like the original, divides pelvic fractures into three basic types according to stability based on the integrity of the posterior sacroiliac complex. It takes into consideration the direction of the force involved. In type A, the fracture does not involve the posterior arch. Type B fracture is a result of rotational forces that cause partial disruption of the posterior sacroiliac complex.

Le Fort classification of fractures of facial skeleton

Le Fort classification divides fractures of the midface skeleton into three basic types according to the location of the fracture plane. However, most fractures are too complex to fit exactly one of the types.

Type Synonym Description
Le Fort I Guérin fracture, floating palate Horizontal fracture though the maxilla and both maxillary sinuses separates the alveolar ridge of maxilla.
Le Fort II

Fracture of shoulder blade, Zdravkovic - Damholt classification of scapular fractures

Zdravkovic classification divides scapular fractures into three types according to their anatomical location.

Type Description
Type I fracture of the body of scapula
Type II fracture of the apophysis including the coracoid and acromion
Type III fracture of the supero-lateral angle including the neck and glenoid

References:

Idiopathic Lung fibrosis - semiquantitative grading of fibrotic and ground glass score

Gay et al. used a semiquantitative score to objectively assess the extent of lung fibrosis. In the study, each lobe was scored separately and mean of all lobes was used as a fibrotic, ground glass, and total score for each patient.

Alveolar score Description
0 no alveolar disease
1 ground glass opacity involving <5% of the lobe (minimal disease)
2 ground glass opacity involving <25% of the lobe
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