Be honest!   Do you just say “thalamic infarct” and hope no one asks questions?   Or can you specify the thalamic vascular territories?   Do you know why the whole thalamus doesn’t infarct when you have a PCA infarct? 
Answer:  It’s supplied both by the PCA & PCOMM (ICA)!   Here are the thalamic vascular territories you NEED to know and HOW to remember them.   Tuberothalamic
From the PCOMM Supplies the anterior thalamus I call it the Top-o-the-thalamic to remember its at the top   Paramedian Branch of the P1 ParaMEDIAN is MEDIAL, so it supplies the medial aspect   Posterior choroidal Supplied by the posterior choroidal artery Posterior choroidal is POSTERIOR—it supplies the back of the thalamus   Thalamogeniculate Branch of the P2 Geniculate is by the GENU of the internal capsule, so it is lateral by the internal capsule   Now you know the thalamic vascular territories & you won’t have lie when it comes to these guys!