Sentinel lymph node mapping for defining site and extent of elective radiotherapy management of regional nodes in Merkel cell carcinoma: a pilot case series.

Merkel cell carcinoma is a rare and aggressive skin malignancy. We discuss sentinel lymph node mapping which is a valuable decision aid for radiotherapy management and planning of treatment volumes as illustrated by four cases.

Assessment of second tier lymph nodes in melanoma and implications for extent of elective neck dissection in metastatic cutaneous malignancy of the parotid.

BACKGROUND: The parotid is the commonest site of cutaneous metastases in the head and neck. The role and extent of neck dissection in patients with parotid metastatic cutaneous malignancy remains controversial. METHODS: We reviewed the lymphoscintigraphy and single photon emission CT (SPECT) of patients with melanoma who had a sentinel node in the parotid to determine the second tier cervical lymph nodes. RESULTS: Levels II and III cervical nodes make up 82% of second tier lymph nodes for the parotid, and levels IV and V, 12% and 4%, respectively. Second tier lymph nodes isolated to levels I, IV, or V, bypassing levels II and III, occurred in only 2% of cases. CONCLUSION: The risk of harboring occult metastasis in levels I, IV, and V when levels II and III are negative is low. Levels II and III neck dissection is likely to be an effective staging procedure in patients with isolated parotid metastases.