Diagnosis: Cutaneous polyarteritis nodosa
A 45-year-old male presented with painful subcutaneous nodules along the calves accompanied by livedo racemosa. These findings suggest an underlying systemic vasculitis, prompting further evaluation to confirm the diagnosis and initiate appropriate management.
A 45-year-old male presented with a 2-week history of painful, tender subcutaneous nodules localized to the bilateral calves and associated livedo racemosa. Examination revealed multiple erythematous nodules with a palpable purpura. The patient reported worsening pain with ambulation and a mild fever.Subcutaneous nodules: Tender and palpable, primarily on the calves.Livedo racemosa: A reticular pattern of violaceous discoloration on the extremities.Palpable purpura: Present in the same regions as the nodules.Systemic symptoms: Mild fever and malaise reported.No evidence of infection: Negative cultures and serologies for common pathogens.
The patient reported the onset of symptoms after a recent upper respiratory infection. He has no significant past medical history, and there is no family history of autoimmune diseases. He denies recent travel, exposure to new medications, or illicit drug use. Social history is unremarkable, with no tobacco or alcohol use.Recent infection: Symptoms began following an upper respiratory illness.Past medical history: No significant previous health issues.Family history: No known autoimmune diseases.Medications: No recent changes; not on chronic medications.Social history: Non-smoker, no alcohol use.
Acute / First-Line ManagementGlucocorticoids: Prednisone 1 mg/kg/day for 4-6 weeks, followed by a taper.Immunosuppressive therapy: Consider initiation of azathioprine or mycophenolate mofetil if symptoms persist or worsen.Pain management: NSAIDs for symptomatic relief.Workup and Diagnostic ConfirmationLaboratory tests: Complete blood count, renal function tests, liver function tests, and inflammatory markers (ESR, CRP).Imaging: Consider ultrasound of the affected areas to assess for vascular involvement.Biopsy: Skin biopsy of a nodule may reveal leukocytoclastic vasculitis.Long-Term ManagementMonitoring: Regular follow-up to assess response to treatment and monitor for complications.Long-term immunosuppression: If there is refractory disease, consider long-term therapy with mycophenolate mofetil or cyclophosphamide.Patient education: Discuss the importance of adherence to therapy and recognition of potential flare symptoms.
Granulomatosis with polyangiitis: Often presents with systemic symptoms and respiratory involvement; ANCA positivity may aid in diagnosis.Churg-Strauss syndrome: Associated with asthma and eosinophilia; may present with similar skin findings.Behçet's disease: Characterized by recurrent oral ulcers, uveitis, and skin lesions; often more systemic in nature.Cutaneous polyarteritis nodosa: Distinct from systemic PAN; presents with skin findings without systemic involvement.Hypocomplementemic urticarial vasculitis: May present with urticarial lesions and systemic symptoms; complement levels are typically low.Essential mixed cryoglobulinemia: Associated with viral infections (e.g., hepatitis C); presents with purpura and systemic symptoms.Subcutaneous nodules from infection: Such as bacterial or fungal infections; typically associated with systemic signs and localized symptoms.Other vasculitides: Consider other forms of cutaneous vasculitis based on clinical context.
High-Yield PearlsTender nodules: Subcutaneous nodules with tenderness can indicate underlying vasculitis and warrant further investigation.Livedo racemosa: This finding is often associated with systemic vasculitis and should prompt consideration of serious underlying conditions.Biopsy: Skin biopsy is crucial for confirming the diagnosis of cutaneous vasculitis and differentiating from other conditions.Systemic symptoms: The presence of systemic symptoms can guide the urgency of treatment initiation.Long-term management: Chronic immunosuppressive therapy may be necessary for relapsing or refractory cases.Recognizing the clinical features of cutaneous vasculitis is essential for timely diagnosis and management.
Tags: polyarteritis nodosa, PAN