Oncology · Genitourinary Malignancies
The facts most likely to be tested
Squamous cell carcinoma is the most common histological subtype of penile cancer, typically arising from the glans or prepuce.
Human papillomavirus (HPV) infection, specifically high-risk types 16 and 18, is the primary oncogenic driver for the majority of cases.
Phimosis and chronic smegma accumulation are major independent risk factors due to persistent inflammation and poor local hygiene.
Patients frequently present with a painless, indurated ulcer, nodule, or fungating mass on the glans penis.
Inguinal lymphadenopathy is the most common site of regional metastasis and requires careful physical examination for palpable nodes.
Excisional biopsy of the primary lesion is the gold standard for definitive tissue diagnosis prior to surgical planning.
Balanitis xerotica obliterans (lichen sclerosus) is a significant pre-malignant dermatologic condition associated with the development of penile squamous cell carcinoma.
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A 62-year-old uncircumcised male presents to the clinic complaining of a persistent, non-healing sore on his penis for the past 4 months. He reports a history of difficulty retracting his foreskin. Physical examination reveals a firm, indurated, ulcerated lesion on the glans penis with associated foul-smelling discharge. There are palpable, firm, non-tender inguinal lymph nodes noted bilaterally. The patient has no history of sexually transmitted infections.
What is the most appropriate next step in the management of this patient?
Excisional biopsy of the penile lesion
The patient's presentation of a chronic, indurated ulcer in the setting of phimosis is highly suspicious for squamous cell carcinoma, necessitating a tissue biopsy for definitive diagnosis.
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Etiology / Epidemiology
Associated with HPV 16/18 and lack of circumcision. Primarily affects uncircumcised men over age 50.
Clinical Manifestations
Painless indurated ulcer or mass on the glans. Erythroplasia of Queyrat is a classic precursor.
Diagnosis
Incisional biopsy is the gold standard. Staging requires inguinal lymph node assessment.
Treatment
Wide local excision or partial penectomy. Avoid delayed diagnosis to prevent nodal metastasis.
Prognosis
Survival depends on inguinal lymph node status. 5-year survival drops significantly with nodal involvement.
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Epidemiology & Etiology
Strongly linked to HPV infection (specifically high-risk types 16 and 18) and chronic inflammation. Phimosis and poor hygiene are major risk factors due to smegma accumulation. Incidence is significantly lower in populations with neonatal circumcision.
Pertinent Anatomy
The glans penis and prepuce are the most common sites of origin. Lymphatic drainage follows the superficial and deep inguinal nodes, which are the primary sites for early metastasis. Understanding this drainage is critical for surgical staging.
Pathophysiology
Chronic irritation leads to squamous metaplasia and subsequent malignant transformation. Most cases are squamous cell carcinoma (SCC). Progression occurs via direct invasion of the corpora cavernosa followed by lymphatic spread to the groin.
Clinical Manifestations
Patients typically present with a painless, indurated ulcer or a fungating mass on the glans or prepuce. Erythroplasia of Queyrat presents as a velvety red lesion on the glans, while Bowen disease presents as a scaly plaque on the shaft. Palpable inguinal lymphadenopathy at presentation may indicate metastatic disease rather than just reactive inflammation.
Diagnosis
A deep incisional biopsy is the gold standard for definitive diagnosis. Imaging such as MRI or CT is utilized to assess the depth of invasion and local nodal involvement. Histopathology confirms the diagnosis of SCC in >95% of cases.
Treatment
Primary management involves surgical excision with tumor-free margins. Partial penectomy is performed for larger or invasive lesions to ensure oncologic control. Radical penectomy is reserved for advanced disease. Adjuvant lymph node dissection is indicated for patients with confirmed nodal metastasis.
Prognosis
The most important prognostic factor is the presence of inguinal lymph node metastasis. Patients require lifelong surveillance for local recurrence and regional nodal progression. 5-year survival is excellent for localized disease but decreases drastically with pelvic node involvement.
Differential Diagnosis
Syphilis: painless chancre with clean base
Chancroid: painful ulcer with ragged borders
Condyloma acuminata: cauliflower-like, non-ulcerated
Lichen planus: violaceous, pruritic papules
Psoriasis: silvery scales, non-ulcerative