title: An unusual transversus abdominis plane block: anatomic variation in the internal oblique muscle.
authors.affiliation: *Department of Anesthesiology and Perioperative Care, University of California, San Francisco.lewv@anesthesia.ucsf.edu.
authors.forename: Vincent K
authors.initials: VK
authors.lastname: Lew
authors.forename: Andrew T
authors.initials: AT
authors.lastname: Gray
mesh_terms: D000005:Abdomen / Q000601:surgery; D000009:Abdominal Muscles / Q000033:anatomy & histology*; D063405:Anatomic Variation; D016477:Artifacts; D005260:Female; D006801:Humans; D007813:Laparotomy; D008875:Middle Aged; D009407:Nerve Block / Q000379:methods*; D014110:Touch; D018084:Ultrasonography, Interventional