Introduction: Lung carcinoma is the most common malignancy in adults and the leading cause of death globally. It is responsible for 25%of all malignancy-related death worldwide. Among various types of lung carcinoma, adenocarcinoma is the most common (50%) of all thevariants. Lung adenocarcinoma metastasising to skeletal muscle is rare in clinical practice. Case report: A fifty three year-old male patientpresented with complaints of swelling over left arm of size 5x4 centimetres which was irregular in shape, soft to hard in consistency andgradually increasing in size. He was symptomatically treated but there was no improvement in clinical condition. In due course of time,patient presented with cough with expectoration. On general physical examination, pulse rate was eighty beats per minute, blood pressure120/80 mmHg, respiratory rate eighteen cycles per minute. On systemic examination, respiratory system revealed bilateral normalvesicular breath sounds, cardiovascular, abdominal and neurological systems were clinically within normal limits. Panel of investigationswere done as a part of work up, inclusive of ultrasonography (USG) and magnetic resonance imaging (MRI) of left arm, computerizedtomography (CT) of chest, fine needle aspiration cytology and positron emission tomography (PET) scan which concludedadenocarcinoma of right lung with left triceps muscle metastasis. Conclusion: Though the metastasis of adenocarcinoma lung is common,metastasis to the skeletal muscle is not so well-known. A clinical suspicion about such pathology can help a clinician to arrive at rightdiagnosis on time. This case report emphasizes that even a trivial swelling in triceps muscle could be hiding the grave adenocarcinoma inthe lung.
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