Inguinal swelling is a common presenting complaint to the surgical clinic. However, among the list of differential diagnoses, Canal of Nuck (CON) cyst, which is rare, is not usually considered and can lead to delayed or misdiagnosis. We report the case of a healthy 41 -year-old woman with a short history of left inguinal swelling initially thought to be an inguinal hernia. Ultrasound showed a unilocular avascular cystic lesion with posterior acoustic enhancement, with no peritoneal cavity communication. Computed tomography scan confirmed the presence of a well -defined, non - enhancing, thin-walled encysted lesion anteromedial to the left common femoral vessels. Surgery confirmed the presence of a CON cyst. It is a rare developmental disorder, especially in the adult female population and should be considered as a differential diagnosis for groin swelling. Imaging can help establish a diagnosis prior to surgery.

Colorectal cancer (CRC) is one of the most common gastrointestinal cancers in the world. In Malaysia, it is the third most common cancer for both men and women. Curative surgical resection with en bloc removal of the regional lymph nodes remains the mainstay of treatment with 5-year survival rate of 70%-90% for local disease. 1 Nonetheless, about 1 in 3 curatively treated CRC patient will suffer from local recurrence or metastasis . 2 Among the usual sites of recurrence are liver, lungs, local and/or regional intraabdominal and retroperitoneal lymph nodes. 3 We report a rare case of colon cancer recurrence to the left kidney after curative surgery and adjuvant therapy, which mimicked left renal cell carcinoma.