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Pulmonary fungus ball caused by Penicillium capsulatum in a patient with type 2 diabetes: a case report
- Min Chen†1,
- Jos Houbraken†2,
- Weihua Pan†1,
- Chao Zhang1,
- Hao Peng3,
- Lihui Wu3,
- Deqiang Xu4,
- Yiping Xiao4,
- Zhilong Wang3 and
- Wanqing Liao1Email author
© Chen et al.; licensee BioMed Central Ltd. 2013
Received: 20 March 2013
Accepted: 25 September 2013
Published: 23 October 2013
Following the recent transfer of all accepted species of Penicillium subgenus Biverticillium to Talaromyces (including Talaromyces marneffei, formerly Penicillium marneffei), Penicillium species are becoming increasingly rare causal agents of invasive infections. Herein, we present a report of a type 2 diabetes patient with a fungus ball in the respiratory tract caused by Penicillium capsulatum.
A 56-year-old Chinese female gardener with a 5-year history of type 2 diabetes presented at the Shanghai Changzheng Hospital with fever, a cough producing yellow-white sputum, and fatigue. The therapeutic effect of cefoxitin was poor. An HIV test was negative, but the β-D-glucan test was positive (459.3 pg/ml). Chest radiography revealed a cavitary lesion in the left upper lobe, and a CT scan showed globate cavities with a radiopaque, gravity-dependent ball. The histopathologic features of the tissue after haematoxylin-eosin staining showed septate hyphae. The fungus was isolated from the gravity-dependent ball and identified as Penicillium capsulatum based on the morphological analysis of microscopic and macroscopic features and on ribosomal internal transcribed spacer sequencing. After surgery, the patient was cured with a sequential treatment of fluconazole 400 mg per day for 90 days and caspofungin 70 mg per day for 14 days.
Although the prognosis is often satisfactory, clinicians, mycologists and epidemiologists should be aware of the possibility of infection by this uncommon fungal pathogen in diabetes patients, since it may cause severe invasive infections in immunocompromised hosts such as diabetes and AIDS patients.
Penicilliosis is an invasive fungal infection that primarily occurs in the southeast and eastern regions of Asia, including Thailand, northeast India, China, Hong Kong, Laos, Cambodia, Malaysia, Myanmar, Vietnam and Taiwan . Penicillium marneffei causes the vast majority of penicillioses, especially in immunosuppressed hosts such as AIDS patients and otherwise healthy individuals [1–3]. This species was recently transferred to the genus Talaromyces together with other Penicillium species belonging to the subgenus Biverticillium. Thus, excluding Talaromyces marneffei (formerly known as P. marneffei), systemic infections caused by Penicillium species are becoming increasingly rare. Currently, approximately 300 species are grouped within the genus Penicillium, and only a limited number are associated with invasive fungal infections . The majority of Penicillium species are saprobic and commonly occur in soil; however, some species are known for their positive or negative effects on humans. The positive impacts include their use in food fermentation and the production of drugs, and the negative effects are related to the production of mycotoxins, the induction of hypersensitivity reactions (e.g., asthma and extrinsic allergic alveolitis) and the infection of humans. Presently, China has an increasing burden of diabetes (92.4 million adults above the age of 20) , and diabetes mellitus is considered to be a significant suppressor of the human immune system. Herein, we report a case of a 56-year-old patient with type 2 diabetes who developed a fungus ball in the left lung caused by Penicillium capsulatum. The diagnosis, treatment and clinical importance of P. capsulatum are discussed.
Antifungal susceptibilities of P. capsulatum isolates from strains isolated from environmental sources and CBS 134186 (μg/mL)
As reviewed by Lyratzopoulos et al. , only fifteen cases of invasive infections caused by species other than T. marneffei have been linked to the Penicillium genus worldwide. More recently, other Penicillium species, such as P. chrysogenum, P. piceum and P. purpurogenum, were found to be associated with these infections [10–13]. However, when applying the current taxonomic concepts , the latter two Penicillium species now belong to the Talaromyces genus, namely T. purpurogenus and T. piceus.
Penicillium capsulatum, a rare species belonging to Penicillium section Ramigena, is considered a useful microorganism in the paper manufacturing industry [14, 15], but it has never been previously recognised as a causative agent of invasive infection in humans. One of the pathogenicity factors of Penicillium species causing invasive infections is its ability to grow at 37°C . The majority of Penicillium species have a maximum growth temperature below 37°C; however, exceptions include P. chrysogenum, P. citrinum, P. decumbens and P. janthinellum, and some of these species are causal agents of invasive infections, as stated above [10, 16]. Our clinical P. capsulatum isolate grows well on MEA, CYA and YES incubated at 37°C, and growth at 30°C and 37°C was faster (17–25 mm) than at 25°C (13–17 mm). In our opinion, both the fungus’s ability to grow at 37°C and the patient’s diabetes mellitus contributed to the presence of the fungus ball in the patient. Despite the clinical strain can be considered resistant to fluconazole, the treatment seemed to be effective in vivo in this case. We believe that combined antifungal drug (caspofungin + fluconazole), resection of the primary lesion, and the patient’s immune status are important for satisfactory prognosis. Additionally, there is no substantial difference in antifungal susceptibilities between the P. capsulatum strains isolated from environmental sources and the CBS 134186 isolate (Additional file 1: Table S1).
In the present study, we used phenotypic characters and ITS sequences for identification. Identification based solely on the phenotype is often difficult and requires well-trained staff. Currently, molecular-based techniques, especially DNA sequencing, are frequently used for identification, and the ITS region is accepted as the primary fungal barcode . This study shows that P. capsulatum can be identified based on ITS sequence data alone. In contrast, other Penicillium (and Aspergillus) species cannot be unambiguously identified by ITS sequencing alone, and partial β-tubulin or calmodulin sequences are required to ensure correct species identification . The initial results based on the chest radiography and CT scan showed structures resembling an aspergilloma caused by Aspergillus. Penicillium and Aspergillus are sister genera and belong to the family Aspergillaceae. This close relationship may explain their resemblance in chest radiographs and CT scans. It should be noted that Aspergillus species cause most pulmonary mycetomas, and other phylogenetically unrelated fungi including Fusarium, Mucor and Paecilomyces, can cause similar clinical manifestations .
In summary, Penicillium capsulatum produced a pulmonary fungus ball in a female patient with type 2 diabetes but was cured with combined surgical and antifungal treatment. An aggressive diagnostic and therapeutic strategy should be pursued for such infections. To our knowledge, this is the first report of a pulmonary infection caused by P. capsulatum worldwide; thus, this report expands our understanding of the pathogenicity of the genus Penicillium in this age of global warming . Clinicians, mycologists and epidemiologists should be aware of the possibility of infection by uncommon fungal pathogens in patients because emerging pathogenic fungi are increasingly recognised as major threats to human health [19, 20].
Written informed consent was obtained from the patient for publication of this Case report and any accompanying images. A copy of the written consent is available for review by the Series Editor of this journal.
We thank Dr. Shuwen Deng and Hongling Jia (Shanghai Changzheng Hospital, Second Military Medical University, China) for her contribution in the isolation of the fungal strain and the reviewers are thanked for the valuable suggestions. This study was funded in part with the grants from the 973 Program (2013CB531601), Shanghai Science and Technology counsel projects of 10DZ22201000, and National Natural Science Foundation of China (No. 31170139 and 81201269).
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