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{| class="wikitable" border="1"
==Table 2==
{| class="wikitable" style="font-size:90%" border="1"
 
|+'''Characteristics of Type A, B, and C Lesions'''
 
|-
! style="width:500px" | Lesion-Specific Characteristics
 
|-
| '''Type A lesions (minimally complex)'''
 
|-
| Discrete (length <10 mm)
|-
| Concentric
|-
| Readily accessible
|-
| Nonangulated segment (<45°)
|-
| Smooth contour
|-
| Little or no calcification
|-
| Less than totally occlusive
|-
| Not ostial in location
|-
| No major side branch involvement
|-
| Absence of thrombus
 
|-
| '''Type B lesions (moderately complex)<sup>&lowast;</sup>'''
|-
| Tubular (length 10 to 20 mm)
|-
| Eccentric
|-
| Moderate tortuosity of proximal segment
|-
| Moderately angulated segment (&gt;45&deg;, &lt;90&deg;)
|-
| Irregular contour
|-
| Moderate or heavy calcification
|-
| Total occlusions &lt;3 mo old
|-
| Ostial in location
|-
| Bifurcation lesions requiring double guide wires
|-
| Some thrombus present
 
|-
| '''Type C lesions (severely complex)'''
|-
| Diffuse (length &gt;2 cm)
|-
| Excessive tortuosity of proximal segment
|-
| Extremely angulated segments &gt;90&deg;
|-
| Total occlusions &gt;3 mo old and/or bridging collaterals
|-
| Inability to protect major side branches
|-
| Degenerated vein grafts with friable lesions
 
|-
| <ul>
<li><sup>&lowast;</sup> Although the risk of abrupt vessel closure may be moderately high with Type B lesions, the likelihood of a major complication may be low in certain instances such as in the dilation of total occlusions &lt;3 mo old or when abundant collateral channels supply the distal vessel.</li>
</ul>
|}
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