So I've looked up the criteria for scatter, and found that most definitely, the VCI should be interpreted with caution. That level of scatter (range of 6 scaled score points) is both statistically significant (p<.05) and rare (base rate of 5.5%). The Comprehension score differing from the average VCI score by that much occurs at an even smaller base rate of only 2% in the norm population.
In short, you should definitely discuss additional testing regarding language-based intelligence.
The perceptual subtests are not that divergent. I should point out that Picture Concepts is a little bit different from the other PRI subtests, in that it is 1) more amenable to verbal mediation, and, 2) not particularly spatial.
On another note: if you want to know more about visual memory span, the Wechsler Nonverbal, WRAML-2, and the UNIT all have some measure of visual/spatial memory span.
