Unilateral vocal cord palsy is typically a manifestation of an underlying condition rather than a primary disease. Common causes include bronchogenic carcinoma, trauma, iatrogenic injury, mediastinal lymphadenopathy, aortic aneurysm and left atrial enlargement[1]. This can compress the recurrent laryngeal nerve (RLN) at various levels, particularly in the aorto-pulmonary window (APW). Mediastinal lymphadenopathy at the APW is a rare cause, accounting for approximately 0.45% of unilateral RLN palsy. Small cell carcinomas are often grouped with carcinoid tumours due to their likely origin from common neuroendocrine precursor cells[3]. These tumors are characterized by rapid growth and early, widespread metastasis, most frequently involving the mediastinal lymph nodes. This report  presents a rare case of  left recurrent laryngeal nerve palsy due to mediastinal lymph node metastasis from a right lung malignancy[2, 4, 5].

A 76 years old farmer from  admitted in AJIMS on 25 Jun 2024 with complaints of change in voice and cough with expectoration since 3 weeks and was apparently normal before 3 weeks, voice change was sudden in onset, non progressive, continuous type and no history of diurnal variation of voice or voice fatigue. He gives history of  loss of appetite since 3 months. However, there is no h/o fever, sore throat, or dysphagia. He is not Diabetic or Hypertensive. His bowel and bladder habits are normal. He had history of smoking beedi (40 pack-years) and no history of alcohol consumption. No h/o similar complaints or malignancies reported among first-degree or extended family members.

USG guided Right cervical lymph node biopsy was done and sent for histopathological examination which showed small round blue cells with scanty cytoplasm (appearing as high nuclear-to-cytoplasmic ratio), hyperchromatic nuclei and absent nucleoli suggestive of metastatic small cell carcinoma ([Fig. 2]). Immunohistochemical marker study was done  i.e. CD65 and Pan CK that showed diffuse strong positive in tumor cells which confirms the diagnosis of metastatic small cell carcinoma. 

The axial contrast-enhanced CT image of the chest shows ill defined large soft tissue density lesion measuring 6.5(CC) x 6.1(AP) x 4.6(TR)cm noted in posterior basal segment of right lower lobe ([Fig. 3]a). The CT scan shows an enlarged mediastinal lymph node, with the largest node measuring approximately 5 × 4 cm located in the right paratracheal region ([Fig. 3]b). There is also a prominent subcarinal or right hilar lymph node visible inferior and posterior to the carina ([Fig. 3]c). Axial CT image of larynx showed reduced bulk of left true vocal cord which indicates paramedian position of left vocal cord ([Fig. 3]d).

The patient received six cycles of chemotherapy (Inj Carboplatin), but he succumbed in January 2025 due to pulmonary haemorrhage as a complication due to small cell carcinoma of lung.

Hoarseness is a common symptom encountered in otorhinolaryngology, often attributed to benign causes such as laryngitis or vocal abuse. However, as demonstrated in this case, hoarseness may serve as the initial and sometimes the only presenting symptom of serious underlying pathology, including bronchogenic carcinoma.

Unilateral vocal cord palsy is frequently linked to pathology along the course of the recurrent laryngeal nerve (RLN), particularly on the left side, owing to its longer intrathoracic course. The nerve is vulnerable to compression by lesions in the mediastinum, especially at anatomical narrowing such as the aortopulmonary window. In our case, metastatic mediastinal lymphadenopathy from small cell carcinoma of the right lung was the causative factor.

Small cell carcinoma is an aggressive neuroendocrine tumor characterized by rapid growth, early dissemination, and a predilection for mediastinal lymph node involvement. The diagnosis in this case was established through imaging and histopathological examination, with immunohistochemical confirmation. Unfortunately, despite initiation of chemotherapy, patient had pulmonary haemorrhage, a known complication of advanced lung malignancy, which led to the patient's demise.

This case highlights the critical importance of considering malignancy in elderly patients presenting with hoarseness, particularly those with risk factors such as a significant smoking history. Early detection and consistent oncological management are vital to improving outcomes in such patients.

Hoarseness, especially when persistent and unexplained, warrants thorough evaluation to exclude serious underlying causes such as small cell carcinoma. This case underscores the need for clinicians to maintain a high index of suspicion and to ensure timely imaging and biopsy in patients at risk. Furthermore, adherence to oncological treatment protocols and regular follow-up play a pivotal role in optimizing prognosis in small cell carcinoma with mediastinal lymph node metastasis.

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Conflicts of Interest: The authors declare no conflicts of interest.

Funding: None.