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Rare case of psevdotumor

Pantoea agglomerans infection behaving like a tumor after plant thorn injury: an unusual presentation.

Pantoea agglomerans infections in humans are uncommon. Most common infections reported are septic arthritis or synovitis. We report the case of a 25-year-old, healthy male, who presented with indurated swelling over the posterolateral aspect of his right thigh, associated with pain for one month. Magnetic resonance imaging (MRI) revealed muscle edema with cystic areas in the posterior-most part of the vastus lateralis of the right thigh. The condition was clinically diagnosed as a right-sided benign tumor of the vastus lateralis muscle. However, Pantoea agglomerans was isolated on a culture of the excised muscle tissue. On the basis of the awareness of the common association of Pantoea with penetrating trauma by vegetation, the patient was asked to recollect any prior such injury. He then gave a history of a fall in the field and a plant thorn prick in the thigh four years back, when he was an agricultural worker. We emphasize the importance of Pantoea agglomerans infection of the soft tissues that can have an atypical presentation as a non-suppurative, indurated, muscle cyst in our case. Thorn injuries are usually ignored as trivial incidents, however, Pantoea infections should always be borne in mind when encountering soft tissue lesions, as antibiotic treatment is required for complete resolution of the lesion.

from: Department of Microbiology and Orthopedics, All India Institute of Medical Sciences, New Delhi, India.
as reported in: Jain S, Bohra I, Mahajan R, Jain S, Chugh TD. Indian J Pathol Microbiol. 2012 Jul-Sep:55(3):386-8. doi: 10.4103/0377-4929.101754.
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