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Rev. Inst. Med. trop. S. Paulo vol.41 n.4 São Paulo July/Aug. 1999
Luiz Carlos SEVERO(1), Flávio de Mattos OLIVEIRA(1), Clotilde Druck GARCIA(2), Anelise UHLMANN(2) & Alberto Thomaz LONDERO(3)
A case of peritonitis due to Scedosporium apiospermum in a boy undergoing continuous ambulatory peritoneal dialysis is reported. The finding of suggestive tissual form of the fungus in the effluent hastened the diagnosis of the infection.
KEYWORDS: Scedosporiosis; Scedosporium apiospermum; Dialysis; Peritonitis.
Fungal peritonitis is an uncommon complication of continuous ambulatory peritoneal dialysis (CAPD). This condition is predominantly caused by fungi inhabiting patients skin, more rarely by environmental fungi and, exceptionally, by dimorphic pathogenic fungi9,15.
In spite of being an environmental cosmopolitan soil and water living fungus4, Scedosporium apiospermum has not yet been quoted as an agent of CAPD associated peritonitis. This is the reason for the presentation of this report. In addition some commentaries on the suggestive forms of S. apiospermum in clinical specimens were also made.
This patient, a 12 year - old boy, was a carrier of hepatitis B surface antigen. He has been undergoing CAPD since Jun/92 because of end-stage renal disease, secondary to cystinosis. Baxter (Deerfield, IL) convecional spike system was used. Four exchange of dialysate fluid (4.25 g/l in 1.5% dextrose solution) per day was performed.
On Dec/92 and, again, on May/93 the patient suffered from Staphylococcus aureus peritonitis. In both episodes he was successfully treated with intraperitoneal vancomycin. On Aug/93, the patient complained of abdominal pain. Soon the dialysate effluent became cloudy. The effluent was then collected for microbiological examination.
Laboratory findings. The dialysate effluent concentration of leukocytes was 1,600/mm3 (90% polymorphs, 10% monocytes/macrophage). Microscopic examination of the sediment of the centrifugated dialysate revealed hyaline, septate hyphae and many one-celled, smooth, ovoid, pale brown conidia with truncate base. These structures, consistent with Scedosporium sp., were also observed in smear of the specimen stained by Gomori methenamine silver stain (Fig. 1). No bacteria were disclosed in Gram stain. Floccose white colonies, that soon turned to dark grey, were obtained on Sabouraud dextrose agar medium, incubated at room temperature. These colonies were composed of hyaline, ramified, septate hyphae and light brown ovoid anneloconidia 6-10x3.5-5µm) with a truncate base. These characteristics identify S. apiospermum.
Fig.1 - Microscopic examination of peritoneal effusion, showing branching septate hyphae and annelloconidia suggestive of S. apiospermum (GMS, x 100)
The Tenckhoff catheter was removed and the patient was put back in hemodialysis. No antifungal therapy was used. On Dec/93 the boy was submitted to a living related donor transplantation. In Jun/96 creatinine value was 1.7 mg% . On Dec/98 the patient was clinically very well.
To our knowledge our case is the first one of CAPD associated peritonitis caused by S. apiospermum.
It was interesting to note that the agent of our patients infection was suspected since the direct microscopic examination of the clinical specimen. A great number of characteristic conidia of Scedosporium type at the side of hyaline, septate hyphae were seen in direct mount of the sediment of the dialysate. This finding hastened the removal of the catheter and also facilitates the selection of the culture medium for the identification of the species.
Scedosporium conidia has been an important finding in the clinical specimen for the diagnosis of scedosporiosis2,7. However, the isolation in culture is necessary to identify the species of Scedosporium. This characteristic forms of the potentially pathogenic species of Scedosporium has been detected in exsudates13, pus from abscess6, organic fluids8, infections or colonization of cavities1,3, endocarditis thrombus5, as well as in histological sections of tissues obtained from many organic active2,9,14,16 or residual17 lesions caused by the two species of pathogenic Scedosporium .
Peritonite por Scedosporium apiospermum em paciente sob diálise peritoneal ambulatorial continuada
É relatado caso de peritonite por Scedosporium apiospermumem menino sob diálise peritoneal ambulatorial continuada. O achado de formas teciduais sugestivas do fungo acelerou o diagnóstico da infecção.
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(1) Laboratório de Microbiologia Clínica, Instituto Especializado em Pesquisa e Diagnóstico, Santa Casa, Porto Alegre, RS, Brasil.
(2) Serviço de Nefrologia, Santa Casa, Porto Alegre, RS, Brasil.
(3) Universidade Federal de Santa Maria, Santa Maria, RS, Brasil.
Correspondence to : Dr. Luiz Carlos Severo, Laboratório de Microbiologia Clínica, IPD-Santa Casa, Annes Dias 285, 90020-090 Porto Alegre, RS, Brazil.
Fax: (5551) 214 8435, E-mail:firstname.lastname@example.org
Received: 09 March 1999
Accepted: 05 April 1999