MiNEN of base of tongue - first case report in literature

Surender Dabas; Nandini N Menon; Bikas Gurung; Reetesh Ranjan; Himanshu Shukla; Sukirti Tiwari; Ashwani Sharma; Bharat Bhushan Bassan; Kunal Jain

doi:10.1007/s00405-024-09007-y

MiNEN of base of tongue - first case report in literature

Eur Arch Otorhinolaryngol. 2024 Oct 2. doi: 10.1007/s00405-024-09007-y. Online ahead of print.

Authors

Surender Dabas¹, Nandini N Menon², Bikas Gurung¹, Reetesh Ranjan¹, Himanshu Shukla¹, Sukirti Tiwari¹, Ashwani Sharma¹, Bharat Bhushan Bassan¹, Kunal Jain³

Affiliations

¹ Department of Surgical Oncology, BLK - MAX Superspeciality hospital, Delhi, India.
² Department of Surgical Oncology, BLK - MAX Superspeciality hospital, Delhi, India. menonnandini1602@gmail.com.
³ DNB Resident, Department of Pathology, BLK - MAX Superspeciality hospital, Delhi, India.

PMID: 39356359
DOI: 10.1007/s00405-024-09007-y

Abstract

Introduction: Mixed neuroendocrine and non-neuroendocrine neoplasms (MiNENs) refer to a heterogenous group of rare neoplasms which is usually composed of a neuroendocrine population which is either well differentiated and more frequently poorly differentiated along with a non-neuroendocrine component, each of the above accounting for at least 30% of the tumour population. It is most commonly seen in the gastro-entero-pancreatic tract. MiNENs have an aggressive behaviour due to its high grade neuroendocrine component and have poor prognosis. This is the first case reported in literature of a MiNEN in the oropharynx.

Case report: 69 year old male patient with no co morbidities presented to the outpatient department with complains of odynophagia for 1 month. He had history of neoadjuvant chemotherapy followed by transoral robotic surgery (TORS) with right selective neck dissection (SND) done in 2019 for carcinoma base of tongue. On flexible laryngoscopy, an ulcerative lesion was noted over the left base of tongue. Although PET scan done showed no significant abnormalities. Biopsy from the lesion showed features of poorly differentiated carcinoma along with morphological features of poorly differentiated neuroendocrine carcinoma (small cell carcinoma). He was planned for upfront surgery (TORS with left SND). Post operatively recovery was uneventful and patient was on ryles tube feed for 12 days. Final histopathology report showed features of mixed neuroendocrine non neuroendocrine neoplasm. He has been on follow up for 1 year with no features of recurrence.

Conclusion: MiNEN is an aggressive tumour which has poor prognosis and is most commonly located in the gastrointestinal tract. This is the first case reported in oropharynx who has been successfully treated and has been on follow up.

Keywords: MiNENs; Mixed adenoneuroendocrine carcinoma, mixed neuroendocrine neoplasm, case report; Mixed neuroendocrine/Non-neuroendocrine neoplasms.