Krouse staging
Sinonasal IPs were staged using the Krouse system. Most patients
(58.5%) in our cohort presented with Krouse stage 3 – this is when the
tumour invades lateral, inferior, superior, anterior, or posterior walls
of the maxillary sinus and/or frontal sinus. (1,2) Table 2 summarises
the rate of recurrences according to different Krouse stages. The
highest rates of recurrence were seen in stage 3, reflecting the more
advanced presentation of the cases, especially in secondary cases.
(Table 2)