Massive Presentation of a Neglected Basal Cell Ulcer on the Forehead and Outcome With Radiation Therapy: A Case Report and Literature Review.

Basal cell carcinoma (BCC) of the scalp is the most common cancer of the skin and is locally invasive. The patched/hedgehog intracellular signaling pathway is responsible for regulating cell growth and tumor formation by inactivating mutation of protein patched homolog 1 (PTCH1) or activating mutation of Smoothened (SMOm). BCC can cause significant morbidity from local destruction if neglected. The risk of metastasis and death is 6.5% in tumors greater than or equal to 2 cm in size. The gold standard treatment is surgical excision. Radiation therapy is used to treat skin cancers as an adjuvant or in patients who are not candidates for surgical intervention or who refuse therapy. It works by using low-energy X-rays or electron beam radiation. They work on the superficial skin and do not affect the organs deeper. Here, we describe the case of a man who presented with an unwitnessed seizure and was found to have a large ulcer on his forehead, which was later diagnosed to be BCC of the scalp eroding the calvarium. The base of the ulcer was the patient's dura and brain. He was successfully treated with electron beam radiation therapy for six weeks with careful preservation of brain tissue. The patient's skin was re-epithelialized and the bone was recalcified. The ulcer on the forehead has completely regressed. This case report and literature review illustrates the evidence to propose the importance of radiation therapy and its potential to be the first-line treatment in BCC, especially in similar cases like ours. Multimodality treatment with a radiation oncologist, dermatologist, and medical oncologist can save patients from devastating outcomes.