[Pubmed] Unexpected Link Between Myasthenia Gravis and Lung Adenocarcinoma: A Case Report

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Case Rep Surg. 2026 Sep 21;2026:6576971. doi: 10.1155/cris/6576971. eCollection 2026.

ABSTRACT

INTRODUCTION: While myasthenia gravis (MG) is commonly associated with thymic abnormalities and other autoimmune diseases, its association with malignancies, particularly lung adenocarcinoma, is exceptionally rare.

CASE PRESENTATION: A 65-year-old male presented with bilateral eyelid drooping, double vision, and fatigable limb weakness, alongside a 4-month history of a non-productive cough. Neurological examination revealed bilateral ptosis, sluggish pupillary reactions, and internuclear ophthalmoplegia. Investigations demonstrated elevated anti-acetylcholine receptor (AChR) antibody levels and nerve conduction studies (NCSs) consistent with MG. Imaging revealed a right middle lobe pulmonary nodule, confirmed as adenocarcinoma via fine-needle aspiration. The patient showed symptomatic improvement with pyridostigmine and prednisolone and underwent surgical resection followed by chemotherapy.

DISCUSSION: Paraneoplastic neurologic syndromes (PNSs), though rare, can manifest as MG in association with malignancies. While MG is typically linked to thymoma, this case illustrates its coexistence with pulmonary adenocarcinoma, a seldom-reported phenomenon. Cross-reactivity between autoantibodies targeting neuronal and muscle AChRs may underlie the pathophysiology, emphasizing the need to evaluate underlying malignancies in atypical MG presentations.

CONCLUSION: Seropositive MG can present as a paraneoplastic syndrome in association with adenocarcinoma of the lung, highlighting the importance of investigating underlying malignancies in atypical or newly diagnosed autoimmune conditions.

PMID:42774512 | PMC:PMC13594766 | DOI:10.1155/cris/6576971


Source: https://pubmed.ncbi.nlm.nih.gov/4277451 ... 5&v=2.20.1