Kaku et al. reported a Transcollicular approach for three hematomas who were completely removed, along with abnormal blood vessels in the wall of the hematoma cavity; all three of these patients experienced neurological improvement.
((Kaku Y, Yonekawa Y, Taub E. [[Transcollicular approach]] to intrinsic [[tectal lesion]]s. Neurosurgery. 1999 Feb;44(2):338-43; discussion 343-4. doi: 10.1097/00006123-199902000-00052. PMID: 9932887.)).