Answers are grounded in this paper and cite their sources.
Some patients with severe hippocampal sclerosis (sometimes called a "burned-out hippocampus") have atypical spread of ictal discharges, resulting in apparent gross discordance between imaging and scalp ictal recordings. These patients nonetheless have excellent surgical outcomes on the whole. Whether such patients may forego intracranial recordings requires further study.
No takes yet. Share an insight, caveat, or question.
Mintzer et al. (2004) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: