The costotransversectomy is a classic operation for spinal tuberculosis that is aimed at curettage and plumbage of the TB focus or abscess through a sophisticated postero-lateral approach. It is introduced by the French surgeon Menard some 100 years ago. You can find the separate surgical steps for costotransversectomy ih the excellent surgical atlas "Orthopaedische Operations-Lehre" (Becken & Wirbelsaule) by Rathke&Schlegel.