=====Sinonasal non Hodgkin lymphoma=====
Sinonasal [[non Hodgkin lymphoma]] (NHL) is a very rare condition. 

====Frontal sinus====
NHL located specifically in the [[frontal sinus]] is even rarer with only 15 cases in the literature reported to date. 

A unique case of diffuse large B-cell lymphoma of the frontal sinus that presented first and was treated as suspected [[Potts puffy tumor]] is presented.

A 69-year-old white man with a history of [[sinusitis]] and two recent endoscopic sinus surgeries presented with enlargement of his right forehead. [[Computed tomography]] and magnetic resonance images revealed a dense opacification of the [[frontal sinus]] bilaterally, thickening and enhancement of the dura mater behind the right frontal sinus, and local [[osteomyelitis]]-like lytic bone changes. A [[bifrontal craniotomy]] was performed. Radical exoneration of the frontal sinus, copious antibiotic-impregnated irrigation after culture swabs, and resection of presumed granulation tissue was performed. Culture swabs remained negative, but histopathology revealed diffuse large B-cell lymphoma. Subsequent chemotherapy was administered. 

Sinonasal NHL is very rare but can occur in the frontal sinus and may present as a suspected [[Potts puffy tumor]]. A high clinical suspicion is necessary for early diagnosis and treatment
((Khan NR, Lakičević G, Callihan TR, Burruss G, Arnautović K. Diffuse Large
B-Cell Lymphoma of the Frontal Sinus Presenting as a Pott Puffy Tumor: Case
Report. J Neurol Surg Rep. 2015 Jul;76(1):e23-7. doi: 10.1055/s-0034-1543996.
Epub 2015 Jan 16. PubMed PMID: 26251804; PubMed Central PMCID: PMC4520977.)).