Unusual case of non-exophytic invasive penile squamous cell cancer arisingfrom a chronic sinus tract

We present an unusual case of an extremely well-differentiated but deeply i nvasive squamous cell carcinoma of the penis without an obvious external le sion, arising from a chronic draining sinus tract. This case highlights how a confounding clinical history, physical examination anti initial biopsies may lead to a significant delay in diagnosis. This delay may have resulted in tumour growth and the need for a more extensive partial penectomy than would have occurred had the diagnosis been made more promptly. Finally, thi s case demonstrates the key diagnostic utility of deep core biopsies of the penis in situations where a cutaneous lesion does not exist.