Pott puffy tumor is a non-cancerous complication of acute sinusitis. It is essentially a subgaleal collection, subperiosteal abscess, and bone infection. It is usually associated with frontal sinus; however, mastoid pathology can also give rise to Pott puffy tumor. Other causes of Pott puffy tumor are: - Trauma - Intranasal Cocaine abuse - Methamphetamine abuse - Craniotomy Reference: https://radiopaedia.org/articles/pott-puffy-tumour Image via: https://www.cmaj.ca/content/191/6/E165