Chronic Expanding Hematoma in the Left Neck Showing Rapid Growth After Fine-needle Aspiration Biopsy

Abstract

A 22-year-old man underwent resection of a subcutaneous mass on the back of the neck four years prior to the first visit to our hospital, and he was diagnosed with a hematoma. Three years after the surgery, the patient noted a subcutaneous nodule on the left side of the neck. As it gradually increased in size, the patient visited our hospital. At the first visit, fine-needle aspiration biopsy was performed at the otolaryngology department to make a diagnosis. Approximately 1 week later, the subcutaneous mass rapidly increased in size accompanying severe pain. Hematoma removal was performed at our department for pain relief, followed by total extirpation, including the surrounding granulation tissues and spilt-thickness skin grafting. Histopathological examination revealed a chronic expanding hematoma (CEH). CEHs have been reported to cause secondary soft tissue malignancies. If CEH is suspected, it should be completely resected with the surrounding tissue. As the possibility of chromosomal abnormality as a cause was recently reported, an increase in cases is expected. Skin Research, 19 : 238-243, 2020