Which organism is associated with lymphocutaneous sporotrichosis having nodular lesions along lymphatic channels?

Which organism is associated with lymphocutaneous sporotrichosis having nodular lesions along lymphatic channels?

• A. Aspergillus fumigatus
• B. Candida albicans
• C. Histoplasma capsulatum
• D. Sporothrix schenckii

Answer: (D)

Lymphocutaneous sporotrichosis presents as nodular lesions that trace along lymphatic channels from the initial skin entry site. The organism responsible is Sporothrix schenckii, a thermally dimorphic fungus found in soil and plant matter. Infection usually follows a minor skin injury with plant material, such as a thorn, leading to a primary lesion at the entry point and ascending nodules along the draining lymphatics. In tissue, Sporothrix schenckii appears as cigar-shaped yeast cells at body temperature, while in the environment it grows as a mold with characteristic conidia arranged on conidiophores. This lymphatic spread pattern helps distinguish it from other fungi: Aspergillus fumigatus commonly affects the lungs or causes invasive disease in susceptible individuals; Candida albicans causes mucocutaneous infections and sometimes disseminates; Histoplasma capsulatum is typically acquired by inhalation and involves the lungs or systemic disease, not a primary lymphatic nodular pattern.

Lymphocutaneous sporotrichosis presents as nodular lesions that trace along lymphatic channels from the initial skin entry site. The organism responsible is Sporothrix schenckii, a thermally dimorphic fungus found in soil and plant matter. Infection usually follows a minor skin injury with plant material, such as a thorn, leading to a primary lesion at the entry point and ascending nodules along the draining lymphatics. In tissue, Sporothrix schenckii appears as cigar-shaped yeast cells at body temperature, while in the environment it grows as a mold with characteristic conidia arranged on conidiophores. This lymphatic spread pattern helps distinguish it from other fungi: Aspergillus fumigatus commonly affects the lungs or causes invasive disease in susceptible individuals; Candida albicans causes mucocutaneous infections and sometimes disseminates; Histoplasma capsulatum is typically acquired by inhalation and involves the lungs or systemic disease, not a primary lymphatic nodular pattern.