Diagnosis: Borderline tuberculoid leprosy
A 35-year-old male presents with a hypopigmented anesthetic plaque on his left forearm that has persisted for six months. Examination reveals a thickened ulnar nerve and sensory loss in the affected area, raising suspicion for a mycobacterial infection. This case highlights the clinical features and diagnostic challenges associated with leprosy.
A 35-year-old male presents with a hypopigmented anesthetic plaque on the left forearm, present for six months. The patient reports a gradual loss of sensation in the area, with no history of trauma or systemic symptoms. On examination, the plaque is well-defined with a smooth surface, and the ulnar nerve is palpably thickened. Sensory examination reveals diminished light touch and pinprick sensation in the distribution of the affected nerve.Hypopigmented plaque: Well-defined, smooth, and anesthetic.Thickened nerve: Palpable enlargement of the ulnar nerve.Sensory loss: Diminished sensation to light touch and pinprick in the affected area.Absence of systemic symptoms: No fever, weight loss, or lymphadenopathy noted.Skin biopsy: Considered for definitive diagnosis.
The patient reports that the onset of the skin lesion was insidious, with no identifiable triggers. He has not received any prior treatments for this condition. His past medical history is unremarkable, and he has no known family history of dermatologic disorders. The patient has traveled to endemic areas and has had close contact with individuals from regions with a higher prevalence of leprosy.Insidious onset: Lesion developed gradually over six months.No prior treatments: Patient has not attempted any topical or systemic therapies.Travel history: Recent travel to regions endemic for mycobacterial infections.Close contact: History of close contact with individuals from endemic areas.Unremarkable past medical history: No chronic illnesses noted.
Acute / First-Line ManagementRifampicin: 600 mg daily.Dapsone: 100 mg daily.Clofazimine: 300 mg monthly and 50 mg daily for skin lesions.Workup and Diagnostic ConfirmationSkin biopsy: Histopathological examination revealing granulomatous inflammation and presence of acid-fast bacilli.Nerve conduction studies: To assess the degree of nerve damage.Serological tests: Not routinely used, but may assist in epidemiological studies.Contact tracing: Important for identifying potential sources of infection.Long-Term ManagementRegular follow-up: Monitor for nerve function recovery and skin lesion resolution.Rehabilitation: Physical therapy to maintain muscle strength and prevent contractures.Patient education: Inform about the disease, treatment adherence, and prevention of transmission.Continued monitoring: For potential side effects of medications.
Granuloma annulare: Presents with annular plaques, typically without sensory loss or thickened nerves.Psoriasis: Characterized by silvery scales and may have associated joint symptoms; sensory loss is not typical.Cutaneous sarcoidosis: May present with plaques but is usually associated with systemic symptoms and non-caseating granulomas.Neurofibromatosis: Can present with skin findings, but typically includes multiple neurofibromas and café-au-lait spots.Leprosy reactions: Type 1 and 2 reactions can complicate the clinical picture but are associated with pre-existing leprosy.Chronic dermatitis: Eczematous or contact dermatitis can cause plaques, but sensory loss is not a feature.Secondary syphilis: May present with skin lesions but lacks the characteristic nerve involvement.
High-Yield PearlsHypopigmented lesions: Often indicative of nerve involvement in mycobacterial infections.Nerve thickening: Palpable nerve enlargement is a hallmark sign of leprosy and differentiates it from other dermatoses.Diagnosis by biopsy: Histopathology is essential for confirming the diagnosis, particularly in atypical presentations.Multidrug therapy: Essential for treatment; adherence is crucial for curing the disease and preventing transmission.Patient education: Important to address stigma and promote understanding of the disease.Leprosy remains a significant global health issue; early recognition and treatment are key to preventing disability.
Tags: leprosy, Hansen disease