First of all, doctors have the right and obligation to process CT films, and can reconstruct a 5 mm scanned image into 10 mm print without affecting the diagnosis. This is normal. Secondly, 16 slice CT does not mean that thin-slice scanning is necessary. Doctors can do thin-layer scanning or routine scanning according to the situation. Unless the application form indicates a thin scan. In addition, you said it was a misdiagnosis, which can only be said by CT diagnostic experts, because many clinicians can't understand CT films, but they can also express their opinions because you don't understand them. This is not to belittle peers, but to say that there is such a phenomenon.
Guiding opinions:
I suggest uploading the CT film, and I'll help you see if the film is misdiagnosed. Or directly consult the director of the department who gave you CT, which should give you an explanation.