PMC9869673_01
Surgical removal of the indwelling needle from the broken scalp vein. (A) The local puncture area of the skin near the superficial forehead vein is red and swollen with cord-like changes. (B) The broken vein indwelling needle is seen as high density on ordinary CT scan. (C,D) 3D-CT imaging clearly shows the specific location of the fracture, as well as the surrounding bone markers. (E) Blood vessels are seen completely wrapped around the broken indwelling needle. (F) The broken catheter was removed successfully during the operation. (G) The broken end coincides with the residual needle stem, which is consistent with the length of the normal indwelling needle.
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F3
The local skin redness and cord-like changes could be seen for approximately 5 days after the indwelling needle broke (Figure 3A). The high-density shadow of the vein indwelling needle under the right forehead scalp could be observed on ordinary CT, although a precise localization was difficult (Figure 3B). 3D-CT imaging clearly showed the location of the blood vessels and related bony markers in the scalp blood vessels (Figures 3C,D). Using 3D-CT imaging for guidance, the epidermis was cut during the operation; the vein was filled, red, and slightly hard when it was slowly separated, and blood vessels were observed to be wrapped around the broken indwelling needle (Figure 3E). The length was 16 mm, which was consistent with that of the residual needle stem and the length of the normal indwelling needle (Figures 3F,G).