Table IV.

Global population description (review including our case series)

	N (%)
Insertion point
Described (%)	94 (48.2%)
Posterior wall	28 (29.8%)
Infundibulum	19 (20.2%)
Orbital roof	19 (20.2%)
Medial wall	14 (14.9%)
Anterior wall	6 (6.4%)
Diffuse insertion in the frontal sinus	6 (6.4%)
Lateral recess	2 (2.1%)
Not univocal	101 (51.8%)
Approach
Described (%)	143 (73.3%)
EEA	83 (58%)
Combined	59 (41.3%)
EAWO	16 (27.1%)
OPF	43 (72.9%)
Exclusive external approach	1 (0.7%)
Not univocal	52 (26.7%)
Mean follow-up (months)	36
Recurrence
Yes	37 (18.9%)
Inside frontal sinus	23 (62.2%)
Outside frontal sinus	9 (24.3%)
Not univocal	5 (13.5%)
No	158 (81.1%)
EEA: endoscopic endonasal approach; EAWO: external approach without osteoplastic flap; OPF: osteoplastic flap.