Colon adenocarcinoma first presenting as shoulder pain. Case report.

• CRC is one of the top causes of death in high-income countries. • Colorectal primary tumours mostly disseminate to liver, lungs and peritoneum. • Bone metastases rarely belong to the unique and curable metastases group of patients. • Isolated colorectal cancer bone metastases are rare and usually associated with better prognosis. • Careful study of the behaviour of rare types of colonic tumours is essential to progress in scientific knowledge. Bone metastases of colorectal cancer (CRC) are uncommon and usually occur in the context of a widespread disease. A 77-year-old woman presented with increasing pain in the right shoulder which had started 5 months earlier. On examination, a hard mass arising from the right scapula was found. There were no other abnormal findings on body Computerized Tomography (CT). A biopsy confirmed a metastatic adenocarcinoma. Further colonoscopy revealed a colonic obstructive tumour. Both solitary metastasis and the primary tumour were treated, and patient maintains a progression-free status. This is an unusual form of presentation for a colon cancer. With this report we aimed to discuss the unique clinical and pathological features of this colonic cancer and call attention of the physicians' community for this atypical presentation. Isolated bone metastasis in CRC is a rare entity and there are only a few similar cases reported in the literature. [ABSTRACT FROM AUTHOR]