The best replacement for sinus tract is fistula.

The best alternatives to sinus tract are rated as following:
★★★★★  fistula
★★  tunneling
★★  sinus track
★  undermining

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Speaking about sinus tract, one probably shouldn't forget about osteomyelitis.

Other search terms related to sinus tract and their ratings are:
★★★★★ osteomyelitis
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sinus tract
fistula
tunneling