Best practice MRI for penile malignancies

Penile cancer is a rare malignancy in the UK, with approximately 760 cases annually. Early symptoms often mimic benign conditions, leading to delayed diagnosis and misdirected referrals. While international guidelines emphasise physical examination for staging, MRI has emerged as a critical tool for accurate assessment and surgical planning, particularly in organ-preserving approaches. Nodal involvement remains the most significant prognostic factor, but precise local staging is essential to avoid unnecessary radical surgery that can severely impact quality of life.

MRI offers high specificity (96 per cent) for detecting T3 disease and is considered the gold standard for evaluating invasion of the tunica albuginea and corpus cavernosum. The use of gadolinium contrast enhances visualisation of vascularity and lesion depth, while intracavernosal agents like alprostadil can improve diagnostic accuracy by up to 90 per cent, enabling true planar imaging and better anatomical delineation. This technique is particularly valuable for differentiating between T1 and T2 lesions and assessing tumour extension to the penile bulb, which ultrasound often fails to resolve.

Standard MRI protocols include high resolution T2-weighted sequences in multiple planes, diffusion-weighted imaging for recurrence or metastasis detection, and contrast-enhanced T1 sequences for small lesions and vascular characterisation. Case studies demonstrate MRI’s role in refining surgical plans, preventing futile procedures and guiding palliative care when disease is underestimated clinically. Despite the lack of universal protocols, the evolving role of MRI underscores its importance in multidisciplinary management of penile cancer.

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