International Cancer Conference Journal

, Volume 8, Issue 4, pp 153–156 | Cite as

A case of medial pterygoid muscle metastasis of lung cancer presenting with trismus

  • Takumi Oshima
  • Hirofumi KunoEmail author
  • Kotaro Sekiya
  • Hayato Tomita
  • Tatsushi Kobayashi
  • Masahiko Kusumoto
Case report


A man in his 60s with severe trismus was referred to our hospital. Based on computed tomography (CT), positron emission tomography/computed tomography (PET/CT), and biopsy, his initial diagnosis at another hospital was oropharyngeal cancer with cervical lymph node and distant metastases. After the review of the contrast-enhanced CT and reevaluated PET/CT images, we updated his diagnosis to left primary lung cancer that had metastasized to the cervical lymph nodes, bones, and skeletal muscles including the right medial pterygoid muscle. Since metastasis from primary lung cancer to the contralateral cervical lymph node is relatively rare, cervical lymph node metastases were thought to have originated from the metastatic lesion in the right medial pterygoid muscle. As metastases in the masticator muscles from lung cancer are rare, it is sometimes necessary to differentiate from primary head and neck lesions. Here, we report a rare case of lung cancer with the onset of trismus due to metastasis to the masticator muscle and perineural spread along the mandibular nerve.


Lung cancer Skeletal muscle metastasis Medial pterygoid muscle Trismus 


Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.


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Copyright information

© The Japan Society of Clinical Oncology 2019

Authors and Affiliations

  1. 1.Department of Diagnostic RadiologyNational Cancer Center Hospital EastKashiwaJapan
  2. 2.Division of Diagnostic RadiologyTokyo Medical and Dental UniversityTokyoJapan
  3. 3.Department of RadiologySt. Marianna University School of MedicineKawasakiJapan
  4. 4.Department of Diagnostic RadiologyNational Cancer Center HospitalTokyoJapan

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