  Scattered light imaging has revealed nearly a dozen circumstellar disks
around young Herbig Ae/Be stars$-$enabling studies of structures in the upper
disk layers as potential signs of on-going planet formation. We present the
first images of the disk around the variable Herbig Ae star PDS 201 (V* V351
Ori), and an analysis of the images and spectral energy distribution through 3D
Monte-Carlo radiative transfer simulations and forward modelling. The disk is
detected in three datasets with LBTI/LMIRCam at the LBT, including direct
observations in the $Ks$ and $L'$ filters, and an $L'$ observation with the
360$^\circ$ vector apodizing phase plate coronagraph. The scattered light disk
extends to a very large radius of $\sim$250 au, which places it among the
largest of such disks. Exterior to the disk, we establish detection limits on
substellar companions down to $\sim$5 M$_{Jup}$ at $\gtrsim$1.5" ($\gtrsim$500
au), assuming the Baraffe et al. (2015) models. The images show a radial gap
extending to $\sim$0.4" ($\sim$140 au at a distance of 340 pc) that is also
evident in the spectral energy distribution. The large gap is a possible
signpost of multiple high-mass giant planets at orbital distances ($\sim$60-100
au) that are unusually massive and widely-separated compared to those of planet
populations previously inferred from protoplanetary disk substructures.
