FIG 4. Giant ranula.

Diagram of axial view shows the anatomic relations of giant ranula (white asterisk), centered in the submandibular space with posterior extension into the parapharyngeal space and an anterior tail extending into the sublingual space. Note the mylohyoid muscle (large arrow) and hyoglossus muscle (small arrow), which define the margins of the sublingual space. Normal anatomic spaces are shown on the right side of the diagram: sublingual space (long thin arrow), submandibular space (black asterisk), and parapharyngeal space (curved arrow). Modified from Coit et al (12) with permission from the Radiological Society of North America.