How Low Can You Go?

Question:   An 8 month old male is referred to you for feeding difficulties and noisy breathing.  Suspecting laryngomalacia, you place the child on anti-reflux medications as first line management.  The child returns with no benefit and has experienced one aspiration pneumonia since his last visit.  Operative microlaryngoscopy reveals a cleft through the entirety of the cricoid cartilage without extension beyond the thoracic inlet.  What type of laryngeal cleft is this?   [Answer will be posted with next week's new question]

Answer to last week's question, Nose Game (March 28, 2016): 

Nasal obstruction.