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  • Short report
  • Open Access

Tongue nodules in canine leishmaniosis — a case report

  • 1, 2,
  • 1, 2,
  • 1, 3,
  • 4,
  • 4,
  • 1, 2,
  • 1, 5,
  • 6 and
  • 1, 7Email author
Contributed equally
Parasites & Vectors20125:120

  • Received: 13 April 2012
  • Accepted: 15 June 2012
  • Published:



Canine leishmaniosis (CanL) caused by Leishmania infantum is an endemic zoonosis in southern European countries. Infected dogs can present rare or atypical forms of the disease and diagnosis can be challenging. The present report describes a case of tongue nodules in a 3-year-old neutered female Labrador Retriever dog with leishmaniosis.


A fine needle aspiration of the lingual nodules revealed amastigote forms of Leishmania inside macrophages. Differential diagnosis ruled out neoplasia, calcinosis circumscripta, solar glossitis, vasculitis, amyloidosis, eosinophilic granulomas, chemical and electrical burns, uremic glossitis and autoimmune diseases. Combined therapy with antimoniate meglumine and allopurinol for 30 days resulted in the normalization of hematological and biochemical parameters. Two months after diagnosis and the beginning of treatment, a mild inflammatory infiltrate was observed by histopathology, but an anti-Leishmania immunofluorescence antibody test (IFAT) was negative as well as a PCR on both tongue lesions and a bone marrow aspirate. Seven months after diagnosis, the dog’s general condition appeared good, there were no tongue lesions and a new IFAT was negative. Fifteen months after diagnosis this clinically favourable outcome continued.


The dog could have suffered a relapsing episode of CanL, but a new systemic or local infection cannot be excluded. Regular clinical re-evaluation should be maintained, as a future relapse can potentially occur. In conclusion, CanL should be considered in the differential diagnosis of nodular glossitis in dogs.


  • Canine leishmaniosis
  • Dog
  • Glossitis
  • Nodules
  • Oral cavity
  • Portugal
  • Tongue


Canine leishmaniosis (CanL) caused by Leishmania infantum is a zoonotic parasitic disease endemic in southern European countries [1, 2]. The pathogeny of CanL is mainly due to pseudogranulomatous inflammation and deposition of immune complexes in cutaneous and visceral tissues, with clinical presentations of chronic and immunosuppressive disease [3]. Dogs infected with L. infantum can present rare or atypical forms of leishmaniosis [4]. These include a few reported cases of single [5, 6] or multiple tongue nodules [7, 8] and ulcers of the lingual mucosa [4, 9].

This report describes a case of tongue nodules in a 3-year-old neutered female Labrador Retriever dog with a diagnosis of leishmaniosis. Diagnosis was carried out two years previously and was based on a positive (titre of 1:80; cut-off titre of 1:80) immunofluorescence antibody test (IFAT) to Leishmania and detection of amastigotes in bone marrow. The dog was treated with meglumine antimoniate (75 mg/kg subcutaneously once a day) plus allopurinol (10 mg/kg orally twice a day) for 30 days and with allopurinol alone (same dosage) for six subsequent months. A regression of clinical signs (ocular signs, disseminated hair loss and dry seborrhoea) and of clinico-pathological alterations (increased blood urea nitrogen [52 mg/dl; reference range: 7–32 mg/dl], increased creatinine [1.99 mg/dl; reference range: 0.5-1.4 mg/dl] and increased urine protein:creatinine [UP:C] ratio [2.4; reference range < 0.2]) was attained after this course of treatment. In a follow-up two years after the initial diagnosis of CanL the dog was in good body condition, alert, hydrated, afebrile, with only mild hair loss and mild dry seborrhea, and without other systemic signs. The owner mentioned the dog was having difficulties with food prehension and chewing. Physical examination of the oral cavity revealed halitosis, generalized gingivitis, ulcerative glossitis and some reddish, soft nodules with 2–9 mm in diameter on the lingual dorsal surface (Figure 1). Differential diagnosis with other nodular and ulcerative diseases of tongue included neoplastic processes [10], calcinosis circumscripta[11], solar glossitis [12], vasculitis [13], amyloidosis [14], eosinophilic granuloma [15], chemical and electrical cord burns, uremic glossitis [14] and autoimmune diseases (systemic lupus erythematosus, pemphigus vulgaris) [13, 14]. A relapse of leishmaniosis with a new clinical presentation was also considered due to the previous diagnosis.
Figure 1
Figure 1

Dorsal surface of the tongue before the beginning of treatment. Multiple and coalescent reddish nodular lesions were seen on the rostral portion.

IFAT for antibodies to Leishmania provided a negative result (titre of 1:40; cut-off titre of 1:80). Complete blood count revealed severe leukopenia (1.4 × 109/L; reference range: 6-17 × 109/L) associated to severe neutropenia (0.68 × 109/L; reference range: 3–11.5 × 109/L) and mild thrombocytopenia (182 × 109/L; reference range: 250-500 × 109/L); and serum biochemical analysis moderate alanine aminotransferase increase (157 IU/L; reference range: 0–130 IU/L). A mild proteinuria was found (10 mg/L) for a urine creatinine level of 1076 mg/L (UP:C ratio: 0.009; reference range < 0.2). Microscopic examination revealed a normal or inactive urine sediment. Serum protein levels were normal (albumin: 2.8 g/dl; reference range: 2.8-3.02 g/dl; globulins: 3.4 g/dl; reference range: 2.8-3.6 g/dl). Measurement of antinuclear antibodies (ANA) gave a titre below 1:40, which is regarded as normal.

The tongue lesions appeared unchanged after seven days of a large spectrum antibiotic treatment with spiramycin plus metronidazole (75,000 IU/kg and 12.5 mg/kg orally once a day, respectively). A fine needle aspiration of the tongue nodules was done under appropriate sedation and microscopic observation of stained smears revealed amastigotes of Leishmania spp. inside macrophages (Figure 2). Uremic glossitis was discarded by serum biochemistry; and autoimmune diseases by negative specific serology (ANA).
Figure 2
Figure 2

Cytological sample from one lingual nodule ( Figure1). Arrows: two intra-macrophagic Leishmania amastigotes (Giemsa; 1000×).

The dog was given another course of meglumine antimoniate and allopurinol for 30 days and allopurinol alone for an additional six-month period. Ten days after diagnosis and the start of combined treatment the lesions apparently improved (Figure 3) and the dog had normal blood and urine analyses. At completion of the meglumine antimoniate and allopurinol combined 30-day course, macroscopic regression of the tongue nodules was observed, but some flattened lesions still persisted. Two months after diagnosis, a few erosive lesions were still visible, mainly on the tongue’s edge (Figure 4). Histopathological examination of incisional biopsy of the lesions showed a mild inflammatory infiltrate, comprising plasma cells, macrophages, a few eosinophils and neutrophils, and no detectable leishmanial forms (Figure 5). Histopathology discarded neoplasia, calcinosis circumscripta, solar glossitis, vasculitis, amyloidosis, eosinophilic granulomas and burns. A real-time PCR assay for Leishmania DNA was carried out on lingual tissue and bone marrow, providing negative results in both cases. At the completion of treatment with allopurinol alone, i.e. seven months after diagnosis, the tongue appeared macroscopically normal (Figure 6) and IFAT was negative (titre < 1:20). Fifteen months after diagnosis this clinically favourable outcome continued (IFAT < 1:20).
Figure 3
Figure 3

Dorsal surface of the tongue at day 10. A few reddish flattened lesions were seen after 10 days of combined treatment with meglumine antimoniate and allopurinol.

Figure 4
Figure 4

Dorsal surface of the tongue at day 60. Some remnant erosive lesions on the edge were seen one month after the end of combined treatment. Two of these lesions were sampled for histopathology (Figure 5) and PCR.

Figure 5
Figure 5

Histopathological image of an erosive lesion ( Figure 4). A mild inflammatory infiltrate mainly comprising plasma cells, macrophages, a few eosinophils and neutrophils (H&E; 400×) was observed one month after the end of combined treatment.

Figure 6
Figure 6

Dorsal surface of the tongue at day 210. Complete healing of macroscopic lesions at the end of treatment with allopurinol alone (seven months after diagnosis).

CanL represents a severe veterinary medical problem, with dogs also playing an important epidemiologic role as a reservoir of infection to humans and further representing an experimental model of the disease [2, 16]. Cases of oral leishmaniosis have been reported in humans with peculiar clinical presentations. These include a lingual fleshy tumour [17], granulomatous glossitis [18], a single lingual nodule associated to several palatal nodular lesions [19] and a voluminous lip tumour [20]. Furthermore, other related clinical conditions have included granulomatous plaques on the tongue [21], upper lip swelling and erythema, with the presence of crusts and scaling [22], painful ulcerations of the floor of the mouth or cheek mucosae [23] and fistulae and granulation of the hard palate [24].

Although it is known that canine cutaneous and visceral leishmaniosis manifestations are frequently diagnosed around the world [2], its oral presentation is quite rare. The first reference of tongue lesions in CanL was published by Font et al., who described a Leishmania-infected dog with proliferative lesions on the tongue and oral cavity mucosa [5]. Saari et al. reported a 7-year-old male mongrel dog with a nodule protruding on the ventral surface of the tongue [6]. Amastigotes were observed after histological analysis of the excised mass. Blavier et al. described a 3-year-old Giant Poodle dog with several partially ulcerated lingual nodules, hyperkeratosis and non-healing ulcers on the footpads, with amastigotes detected on fine needle aspiration smears of those nodules [4]. Lamothe and Poujade reported a case of ulcerative glossitis in a 10-year-old mongrel dog, also presenting enlargement of the peripheral lymph nodes and splenomegaly. Amastigote forms were observed in biopsy samples obtained from this animal [9]. Manzillo et al. described an atypical situation of multiple red papules on the tongue surface in a 4-year-old female Doberman, which presented weight loss and multiple cutaneous, ocular and haematological alterations. Definitive diagnosis was obtained by IFAT and cytological identification of parasites in lingual lesions and bone marrow aspirates [25]. Parpaglia et al. showed a peculiar case of multiple non-ulcerated, dome-shaped nodular lesions on the tongue, as well as ocular and cutaneous lesions, enlargement of lymph nodes and mild splenomegaly in a 5-year-old intact female mongrel dog. Amastigotes were observed in histological samples of this animal [7]. A new report by Manzillo et al. described a multiple red, nodular lesions on the dorsal and lateral surfaces of the tongue. Diagnosis was made on the basis of a positive IFAT and amastigote observation in lingual lesions as well as in bone marrow [8].

Dogs reported by Saari et al.[6] and Lamothe and Poujade [9] had to be euthanized because of an adverse response to antimonial therapy and necrotic dermatitis, and poor physical conditions, respectively. The first dog described by Manzillo et al. died six months after diagnosis due to systemic disease [25]. The second case of Manzillo et al. had full remission of clinical signs at the end of a combined treatment with miltefosine and allopurinol [8].

It can be hypothesized that the dog described in the present report suffered a relapsing form of CanL, as suggested in similar cases by other authors [9]. However, parasites could have directly invaded the tongue mucosa through the bites or crushing of infected phlebotomine sandfly vectors, rather than having diffused from the skin or visceral organs [25, 26]. Leucopenia and neutropenia might be explained by an increased tissue demand of white blood cells associated with the severe oral inflammation. Taking into account these clinico-pathological alterations and a possible relapse, the hypothesis of a false negative result for the IFAT titre (1:40) at the time of diagnosis should be considered. The dog presented a good response to treatment, with a complete regression of the tongue lesions. Nevertheless, a future relapse cannot be excluded and regular clinical re-evaluation should be maintained.

In conclusion, the reported case represents an uncommon clinical presentation of CanL, which should be included in the list of differential diagnosis for nodular and ulcerative glossitis in dogs.




The authors thank Mrs. Lígia Lourenço and Eng. Teresa Coutinho for technical assistance. Publication of the CVBD7 thematic series has been sponsored by Bayer Animal Health GmbH.

Authors’ Affiliations

Department of Veterinary Sciences, School of Agrarian and Veterinary Sciences, University of Trás-os-Montes e Alto Douro (UTAD), Vila Real, Portugal
Department of Polymer Engineering, 3B’s Research Group – Biomaterials, Biodegradables and Biomimetics, University of Minho, Guimarães, Portugal
Centre of Genetics and Biotechnology – Institute for Biotechnology and Bioengineering, UTAD, Vila Real, Portugal
Veterinary Hospital, UTAD, Vila Real, Portugal
CECAV – Veterinary and Animal Science Centre, UTAD, Vila Real, Portugal
Leishmanioses Laboratory, Medical Parasitology RTU, Institute of Hygiene and Tropical Medicine, Lisbon, Portugal
Parasite Disease Group, IBMC – Instituto de Biologia Celular e Molecular, University of Oporto, Oporto, Portugal


  1. Baneth G, Koutinas AF, Solano-Gallego L, Bourdeau P, Ferrer L: Canine leishmaniosis - new concepts and insights on an expanding zoonosis: part one. Trends Parasitol. 2008, 24: 324-330. 10.1016/ ArticlePubMedGoogle Scholar
  2. Solano-Gallego L, Miro G, Koutinas A, Cardoso L, Pennisi MG, Ferrer L, Bourdeau P, Oliva G, Baneth G, The LeishVet G: LeishVet guidelines for the practical management of canine leishmaniosis. Parasit Vectors. 2011, 4: 86-10.1186/1756-3305-4-86.PubMed CentralView ArticlePubMedGoogle Scholar
  3. Day MJ: The immunopathology of canine vector-borne diseases. Parasit Vectors. 2011, 4: 48-10.1186/1756-3305-4-48.PubMed CentralView ArticlePubMedGoogle Scholar
  4. Blavier A, Keroack S, Denerolle P, Goy-Thollot I, Chabanne L, Cadore JL, Bourdoiseau G: Atypical forms of canine leishmaniosis. Vet J. 2001, 162: 108-120. 10.1053/tvjl.2000.0556.View ArticlePubMedGoogle Scholar
  5. Font A, Roura X, Fondevila D, Closa JM, Mascort J, Ferrer L: Canine mucosal leishmaniasis. J Am Anim Hosp Assoc. 1996, 32: 131-137.View ArticlePubMedGoogle Scholar
  6. Saari S, Rasi J, Anttila M: Leishmaniosis mimicking oral neoplasm in a dog: an unusual manifestation of an unusual disease in Finland. Acta Vet Scand. 2000, 41: 101-104.PubMedGoogle Scholar
  7. Parpaglia MLP, Vercelli A, Cocco R, Zobba R, Manunta ML: Nodular lesions of the tongue in canine leishmaniosis. J Vet Med A Physiol Pathol Clin Med. 2007, 54: 414-417. 10.1111/j.1439-0442.2007.00994.x.View ArticlePubMedGoogle Scholar
  8. Manzillo VF, Paparcone R, Cappiello S, De Santo R, Bianciardi P, Oliva G: Resolution of tongue lesions caused by Leishmania infantum in a dog treated with the association miltefosine-allopurinol. Parasit Vectors. 2009, 2: 1-4. 10.1186/1756-3305-2-1.View ArticleGoogle Scholar
  9. Lamothe J, Poujade A: Ulcerative glossitis in a dog with leishmaniasis. Vet Rec. 2002, 151: 182-183. 10.1136/vr.151.6.182.View ArticlePubMedGoogle Scholar
  10. Syrcle JA, Bonczynski JJ, Monette S, Bergman PJ: Retrospective evaluation of lingual tumors in 42 dogs: 1999–2005. J Am Anim Hosp Assoc. 2008, 44: 308-319.View ArticlePubMedGoogle Scholar
  11. Tafti AK, Hanna P, Bourque AC: Calcinosis circumscripta in the dog: a retrospective pathological study. J Vet Med A Physiol Pathol Clin Med. 2005, 52: 13-17. 10.1111/j.1439-0442.2004.00675.x.View ArticlePubMedGoogle Scholar
  12. Arnold P, Arnold S, Hauser B, Staehelin B, Lohrer A: Solare Glossitis bei Schlittenhunden. Schweiz Arch Tierheilkd. 1998, 140: 328-332.PubMedGoogle Scholar
  13. Pedersen NC: A review of immunologic diseases of the dog. Vet Immunol Immunopathol. 1999, 69: 251-342. 10.1016/S0165-2427(99)00059-8.View ArticlePubMedGoogle Scholar
  14. Arzi B, Anderson JG, Verstraete FJM: Oral manifestations of systemic disorders in dogs and cats. J Vet Clin Sci. 2008, 1: 112-124.Google Scholar
  15. Bredal WP, Gunnes G, Vollset I, Ulstein TL: Oral eosinophilic granuloma in three cavalier King Charles spaniels. J Small Anim Pract. 1996, 37: 499-504. 10.1111/j.1748-5827.1996.tb01753.x.View ArticlePubMedGoogle Scholar
  16. Palatnik-de-Sousa CB, Day MJ: One Health: the global challenge of epidemic and endemic leishmaniasis. Parasit Vectors. 2011, 4: 197-10.1186/1756-3305-4-197.PubMed CentralView ArticlePubMedGoogle Scholar
  17. Habibzadeh F, Sajedianfard J, Yadollahie M: Isolated lingual leishmaniasis. J Postgrad Med. 2005, 51: 218-219.PubMedGoogle Scholar
  18. Diamantopoulos EJ, Andreadis EA, Tsourous GI, Petraki CD, Rontogianni DP: Persisting afebrile swelling of the lips and tongue: an unusual case of granulomatous glossitis. Am J Med. 2006, 119: 182-183. 10.1016/j.amjmed.2005.06.065.View ArticlePubMedGoogle Scholar
  19. Borzoni F, Gradoni L, Gramiccia M, Maccioni A, Valdes E, Loddo S: A case of lingual and palatine localization of a viscerotropic Leishmania infantum zymodeme in Sardinia, Italy. Trop Med Parasitol. 1991, 42: 193-194.PubMedGoogle Scholar
  20. Ferreli C, Atzori L, Zucca M, Pistis P, Aste N: Leishmaniasis of the lip in a patient with Down's syndrome. J Eur Acad Dermatol Venereol. 2004, 18: 599-602. 10.1111/j.1468-3083.2004.00987.x.View ArticlePubMedGoogle Scholar
  21. Vargas Laguna E, Aguilar Martinez A, Fernández Cogolludo E, Martín L, Merano F, Gallego Valdés MA: Leishmaniasis of the tongue due to Leishmania infantum. Eur J Dermatol. 2008, 18: 472-473.PubMedGoogle Scholar
  22. Veraldi S, Bottini S, Persico MC, Lunardon L: Case report: leishmaniasis of the upper lip. Oral Surg Oral Med Oral Pathol Oral Radiol Endod. 2007, 104: 659-661. 10.1016/j.tripleo.2007.02.014.View ArticlePubMedGoogle Scholar
  23. de Marcos JA García, Dean Ferrer A, Alamillos Granados F, Ruiz Masera JJ, Cortés Rodríguez B, Vidal Jiménez A, García Lainez A, Lozano Rodríguez-Mancheño A: Localized leishmaniasis of the oral mucosa: a report of three cases. Med Oral Patol Oral Cir Bucal. 2007, 12: 281-286.Google Scholar
  24. Van Damme PA, Keuter M, Van Assen S, DeWilde PCM, Beckers PJA: A rare case of oral leishmaniasis. Lancet Infect Dis. 2004, 4: 53-53. 10.1016/S1473-3099(03)00861-2.View ArticlePubMedGoogle Scholar
  25. Manzillo VF, Pagano A, Paciello O, Di Muccio T, Gradoni L, Oliva G: Papular-like glossitis in a dog with leishmaniosis. Vet Rec. 2005, 156: 213-215.View ArticleGoogle Scholar
  26. Miró G, Gálvez R, Fraile C, Descalzo MA, Molina R: Infectivity to Phlebotomus perniciosus of dogs naturally parasitized with Leishmania infantum after different treatments. Parasit Vectors. 2011, 4: 52-10.1186/1756-3305-4-52.PubMed CentralView ArticlePubMedGoogle Scholar


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