Fig. 1
From: Surgical treatment of fourth branchial apparatus anomalies: a case series study
Pre-operative diagnosis and intra-operative confirmation. a Outflow of barium from pyriform sinus into the fistula tract and further into the massive cervical lesion could be seen on X-ray film (see blue arrow). b Intra-operative direct laryngoscope visualized the internal orifice at the apex of pyriform fossa of the same patient. c Intra-operative confirmation of entry into pyriform fossa at the inferior cornu of thyroid cartilage (see blue arrow) of the same patient