We describe a rare case of a subcutaneous infection by both Phaeoacremonium venezuelense and Plectophomella sp. in a Brazilian male. Sequencing of a -tubulin gene fragment allowed us to confirm the identification of the former. However, a similar procedure of sequencing rRNA gene fragments was not useful for the identification of the latter fungus.
CASE REPORTA 28-year-old Brazilian male was diagnosed with chronic myeloid leukemia in 2001. He underwent a bone marrow transplant in July 2002, but after 1 month he developed a graft-versus-host disease that compromised the skin and liver. After that, he started taking cyclosporine, mycophenolate mofetil, and prednisone. In 2004, he presented with several soft, erythematous nodules arranged in a linear distribution on the right arm (Fig. 1A) and two nodules forming a plaque lesion with fibrous consistency on the left knee ( Fig. 2A). Three serial biopsies of both lesions were taken on different days for histopathological and microbiological study. The direct examination on KOH did not reveal any type of fungal structure. Grocott and periodic acid Schiff stains revealed the presence of dematiaceous hyphae in the two types of lesions (Fig. 1B and 2B, respectively). Cultures on routine media for bacteria and fungi showed the presence of a single fungus in the samples from the leg and another, different fungus in the samples from the arm. Infections were diagnosed as subcutaneous mycoses, and the fungi were sent to the Medical School at the Universitat Rovira i Virgili for identification. The lesions were surgically removed. Since the patient showed hepatic and renal dysfunctions and general deterioration, antifungal treatment was not initiated. The patient subsequently moved to another city and was lost to follow-up.The two isolates were cultured on routine media for fungi. On the basis of its morphological features (i.e., darkly pigmented colonies and phialidic conidiogenous cells with conspicuous collarettes), the fungus isolated from the arm lesions was identified as a Phaeoacremonium sp. strain CBS 120024.On malt extract agar (Difco Laboratories, Detroit, Mich.), its colonies were camel to sunburn color, attained a diameter of 47 to 50 mm in 2 weeks at 25°C, and were able to grow at 40°C. Microscopically, it showed short and usually unbranched conidiophores, bearing an elongate ampulliform attenuated at the base or subcylindrical conidiogenous cells, often 9 to 17 m long by 1 to 2.5 m wide, from which fusiform-ellipsoidal hyaline conidia that were 3 to 6 m long by 1 to 1.5 m wide were produced (Fig. 1C). Conidiogenous cells with two apertures (polyphialides) were also present. Hyphae from aerial mycelium were verruculose, with warts not exceeding 2 m wide. Following the morphological criteria given by Mostert et al. (7) to recognize Phaeoacremonium species, we were not able to identify our isolate at the species level, so we used the molecular method proposed by the same authors. A fragment of the -tubulin (tub2) gene defined by primers BT2-F and BT2-R (2) was amp...