Abstract
A 62-year old Japanese man presented with an ulcerated mass on the posterior surface of his right thigh. He had been aware of the lesion for seven years but decided to see a doctor after it grew and became ulcerated. Biopsy results showed the tumor to be squamous cell carcinoma. By contrastenhanced magnetic resonance imaging, we found an inter-muscular mass of the biceps femons of the right thigh. After surgical resection, we further diagnosed it as a lymph node metastasis of squamous cell carcinoma. Interval nodes, which lie along the course of a lymphatic vessel between a lesion site and a recognized node field, are not uncommon in the trunk but rare in the leg. Based on the anatomical distribution between the lymph node and the primary lesion of the cancer, we determine that this lymph node was one of the interval nodes. [Skin Cancer (Japan) 2006; 21: 310-313]
