# Coccygodynia in a Long-Term Cancer Survivor Diagnosed with Metastatic Cancer: A Case Report

## TL;DR

An 87-year-old woman with a history of rectal cancer developed a rare metastasis in her coccyx 10 years after treatment, highlighting the need for long-term monitoring.

## Contribution

This case report emphasizes the importance of continued vigilance for late metastatic recurrences beyond the standard 5-year follow-up period in cancer survivors.

## Key findings

- Metastatic cancer can occur in the coccyx many years after initial treatment for rectal cancer.
- Simple coccygeal pain can be the only symptom of late metastasis, without typical cancer-related signs.
- Ultrasound and advanced imaging are critical for diagnosing late metastatic recurrences.

## Abstract

Background and Objectives: Rectal cancer is considered cured if no recurrence is found during the 5-year follow-up period after treatment. After this period, patients often believe that the cancer is completely eradicated. However, in modern society, where lifespans have become longer, it is important to recognize that metastatic cancer may occur long after the initial treatment has concluded. This highlights the necessity of continued vigilance and the long-term follow-up of cancer survivors. Case report: We present a case of metastatic cancer of the coccyx in an 87-year-old female patient. This patient had undergone successful surgery and treatment for rectal cancer 10 years prior. She was considered cured after the standard 5-year follow-up period as she showed no signs of recurrence. The patient presented with simple coccygeal pain as the main complaint, without any other accompanying symptoms such as weight loss, fever, or changes in bowel habits, typically associated with cancer recurrence. During the clinical evaluation, irregularities in the bone cortex were detected while performing a nerve block using ultrasound. Given these findings, further diagnostic evaluations were performed. Advanced imaging techniques including MRI and CT scans led to a diagnosis of coccygeal metastasis. Conclusions: While the 5-year mark post-treatment is a significant milestone for rectal cancer patients, it does not guarantee the absolute eradication of the disease. Long-term monitoring and a thorough evaluation of new symptoms are essential for the early detection and management of late metastatic recurrences. This approach ensures that patients receive timely and appropriate care, potentially improving outcomes and quality of life.