Different indocyanine green fluorescence patterns of two skin metastases of hypopharyngeal squamous carcinoma: A case report.

BACKGROUND: Skin metastasis from primary squamous cell carcinoma of the head and neck is rare . These metastatic lesions are usually detected by physical examination, ultrasound imaging, computed tomography, and positron emission tomography.. Recently, indocyanine green fluorescence angiography (ICG-FA) has been used to discover superficial tumors. However, the optimum timing of ICG injection and fluorescence patterns of skin tumors in ICG-FA are still unknown. CASE PRESENTATION: We encountered a 60-year-old man with hypopharyngeal squamous cell carcinoma. The patient underwent concurrent chemotherapy, radiotherapy, and surgery. However, following these treatments, the patient developed two nodules in the skin of the right upper limb. Thus, the patient underwent ICG-FA. The two skin metastatic nodules showed different fluorescence patterns. One lesion showed high fluorescence intensity during ICG-FA. However, the fluorescence intensity of a small part of the other lesion exceeded that of the surrounding tissue only for a short time. CONCLUSION: We suggest that ICG-FA is effective for detecting skin metastases, and with further studies on the various fluorescence patterns of skin tumors, this technique will become more efficient.

Indocyanine green fluorescence angiography for detection of cutaneous angiosarcoma of the scalp: A case report.

Cutaneous angiosarcoma is a rare neoplasm. One important predictor of recurrence is the resection margin; however, identifying the tissue area containing malignant cells is difficult. Indocyanine green fluorescence angiography (ICG-FA) has been used to identify superficial malignancies, including malignant tumors in the liver and sentinel lymph node metastasis of breast cancer. ICG-FA is also used to identify and define the resection margin of cutaneous angiosarcomas. However, there are currently only a few reports on the application of ICG-FA for detecting cutaneous angiosarcomas. We report a case of cutaneous angiosarcoma in the scalp in which one lesion, located in the parietal scalp, showed high fluorescence intensity corresponding exactly with the lesion was defined by physical examination, whereas the malignant area of the second lesion, located in the occipital scalp, was revealed more accurately by ICG-FA than by physical examination. Further, the second lesion was the first case diagnosed as angiosarcoma by the limited-area biopsy for a high-intensity area of ICG-FA. By determining where ICG is located within cutaneous angiosarcomas and quantitating the ICG intensity level corresponding to the malignant area, ICG-FA could be a promising tool for identifying cutaneous angiosarcomas.