Question: A 43 year old woman presents with a history significant for recent vision loss and headache. She undergoes workup with your neurology colleagues and is ultimately diagnosed with a large sellar tumor. With the assistance of your neurosurgical colleague, you proceed with endonasal resection. At the conclusion of the procedure, there is a large skull base defect and a spinal fluid leak. You elect to use a multilayered technique for closure, and elevate a mucosal flap along the nasal septum and floor which you use to swing over the defect, providing vascularized tissue. What is the arterial supply for this flap? [Answer will be posted with next week's new question]

Answer to last week's question, Not Just a Birthmark (Apr 27, 2015):

Airway infantile hemangioma, involving the subglottis.