What is the first‑line treatment for autoimmune orchitis in a reproductive‑age male with testicular discomfort, a tender testis, and anti‑sperm antibodies (ASA) when aspirin is contraindicated?

First-Line Treatment for Autoimmune Orchitis When Aspirin is Contraindicated

Corticosteroids are the first-line treatment for autoimmune orchitis in reproductive-age males when aspirin is contraindicated, as glucocorticoids directly suppress the T-cell-mediated autoimmune response that drives testicular inflammation and anti-sperm antibody production. 1, 2

Understanding Autoimmune Orchitis Pathophysiology

Autoimmune orchitis results from disruption of the blood-testis barrier, allowing immune cells—particularly autoreactive T lymphocytes—to access the testicular microenvironment and mount an inflammatory response against germ cells. 1, 2 This T-cell-mediated process produces pro-inflammatory cytokines (IFN-γ, IL-2) that induce apoptosis of spermatocytes and spermatids, while simultaneously triggering anti-sperm antibody (ASA) production. 2, 3

• The inflammatory cascade is characterized by focal or multifocal peritubular lymphocyte infiltration with concomitant damage to seminiferous tubules. 4
• ASA cause immobilization and agglutination of spermatozoa, blocking sperm-egg interaction and resulting in infertility. 2
• Despite the patchy distribution of lesions, testicular volume and spermatogenesis scores may be significantly reduced. 4

Corticosteroid Therapy as First-Line Treatment

Glucocorticoids are indicated in autoimmune orchitis because they suppress the underlying T-cell-mediated immune response and reduce pro-inflammatory cytokine production (IFN-γ, IL-2) in both splenic and testicular tissue. 1, 3

Mechanism of Action

• Corticosteroids directly inhibit the delayed-type hypersensitivity (DTH) response that plays a key role in autoimmune orchitis development. 3
• They reduce the number of cytokine-expressing T cells in the testes and spleen, thereby decreasing inflammation and protecting spermatogenesis. 3
• Glucocorticoids restore blood-testis barrier integrity by reducing inflammatory permeability. 2

Clinical Application

• Prednisone 0.5–1 mg/kg/day is a reasonable starting dose for symptomatic autoimmune orchitis, tapered over 4–8 weeks based on clinical response (testicular discomfort resolution, improvement in semen parameters). 1
• Monitor for testicular pain reduction, decreased testicular tenderness on examination, and improvement in sperm count/motility on repeat semen analysis at 3 months. 1, 4

Important Caveats and Pitfalls

Diagnostic Confirmation

• Definitive diagnosis of chronic asymptomatic orchitis requires testicular biopsy, as clinical signs are often nonspecific and the disease course is typically asymptomatic. 4
• ASA testing should be performed to confirm autoimmune etiology—ASA are present in 100% of primary autoimmune orchitis cases but only up to 50% of secondary cases. 2
• Exclude systemic autoimmune diseases (polyarteritis nodosa, Behçet's disease, Henoch-Schönlein purpura, SLE) that cause secondary autoimmune orchitis, as these require different management. 1, 2

Treatment Limitations

• There are no standardized treatment protocols or double-blind randomized trials confirming the efficacy of any treatment regimen for autoimmune orchitis. 2
• The real clinical significance of ASA in infertile men remains controversial, and treatment may not restore fertility even when inflammation is controlled. 1
• Corticosteroid therapy is more clearly indicated when active systemic autoimmune disease is present (secondary autoimmune orchitis), but evidence for primary autoimmune orchitis is limited to case series and animal models. 1, 3

Fertility Preservation Strategy

If corticosteroid therapy fails to improve semen parameters after 3–6 months, proceed directly to assisted reproductive technology rather than prolonging immunosuppression. 1, 2

• Intracytoplasmic sperm injection (ICSI) is the best choice for patients with severe sperm autoimmunity, particularly when ASA cause low sperm counts or motility. 1
• Intrauterine insemination (IUI) or in vitro fertilization (IVF) are options for less severe cases. 1
• Sperm cryopreservation should be performed immediately (2–3 separate collections) before initiating corticosteroid therapy, as testicular inflammation may progress despite treatment. 1, 4

Alternative Immunosuppressive Agents

If corticosteroids are contraindicated or ineffective:

• Immunosuppressive drugs (azathioprine, methotrexate, cyclosporine) have been used in secondary autoimmune orchitis associated with systemic autoimmune diseases, but evidence is limited to case reports. 1
• These agents carry significant side effects and should only be considered in consultation with rheumatology when systemic disease is present. 1

Monitoring Protocol

• Repeat semen analysis every 3 months to assess treatment response. 4
• Monitor for corticosteroid side effects (hyperglycemia, hypertension, weight gain, bone density loss). 1
• If testicular pain persists or worsens despite corticosteroids, consider testicular biopsy to exclude other pathology (tumor, chronic infection). 4
• Avoid exogenous testosterone therapy, as it will completely suppress spermatogenesis through negative feedback and worsen infertility. 1