History of left retromolar trigone treated with CRT and salvage surgery, with recent biopsy proven tumor recurrence. There are post-treatment findings in the left upper neck and aerodigestive tract region. There is an infiltrative mass in the left oral cavity and masticator space with involvement of the left retromolar trigone, left floor of mouth, left oral tongue, posterior left buccal region along the pterygomandibular raphe, left medial pterygoid muscle, and left mandible. Overall, the tumor measures up to approximately 5 cm. There is no evidence of significant cervical lymphadenopathy. However, there are mildly prominent upper mediastinal lymph nodes. The remaining major salivary glands are unremarkable. There is mild scattered paranasal sinus mucosal thickening. There is a small amount of fluid within the left mastoid air cells. The cervical spine is intact. The imaged intracranial structures and orbits are grossly unremarkable.
Findings compatible with tumor recurrence involving the left oral cavity and masticator space. No evidence of significant cervical lymphadenopathy. However, the assessment is limited by the lack of intravenous contrast administration.