With the development of new instruments and innovations in endoscopic techniques, the Draf type III/endoscopic modified Lothrop procedure (EMLP) has been widely used to treat intractable frontal sinus disease ¹⁾.

The endoscopic modified Lothrop procedure (EMLP) is well established for resistant frontal sinus disease and anterior skull base (ASB) exposure. However, this technique may be unnecessarily aggressive by removing avoidable sinonasal structures in select cases. Previously,Eloy et al in a cadaveric study, proposed a modification of the EMLP, termed the modified subtotal-Lothrop procedure (MSLP), to access the ASB and to address complex frontal sinus disease, for which access to the bilateral frontal sinus posterior table is required ^{2) 3)}.