Fig. 2

Retinoblastoma regression documented on hand-held optical coherence tomography (HH-OCT) in the right eye. The initially unaffected right eye (a) demonstrated a small retinoblastoma temporal to the fovea of 1.51 mm in basal dimension and 372 µm in thickness (b). One month following transpupillary thermotherapy (TTT), the tumor (c) showed regression, confirmed as a (d) hyperreflective scar on OCT of 166 µm thickness. At 5 months after TTT, the flat scar (e) measured 73 µm thickness on HH-OCT (f)