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We placed T-shaped bile duct tubes (T-tubes) in the naso-frontal ducts of three patients with recurrent frontal cysts or sinusitis resulting from drainage by the extranasal approach. The first patient developed recurrent frontal sinusitis after anterior skull base resection for ethmoidal squamous cell carcinoma. The second patient had undergone 5 operations for a recurrent frontal cyst. The third patient experienced relapse of a frontal sinus cyst 40 years after initial surgery. A T-tube wasdoi:10.5106/jjshns.16.155 fatcat:hutwqjm2czfnxj5yxivbznnjzq