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RTLA 
2555. Medaka, Oryzias latlpes 
Material: One microslide of growth caudal from the left eye 
Habitat': Netherlands, Bilthoven: National Institute of 
Public Health breeding stock 
Diagnosis: Malignant l 3 nnphoma, well-differentiated type 
Submitter: P. W. Wester 
RTLA 2556. Shrimp, Penaeus japonicus and Penaeus stylirostris 
Material: Three microslides of lesions in japonicus ; 
1 control microslide stylirostris ) 
Diagnosis: (1) hypertrophy of midgut basal lamina; (2) 
atrophic skeletal muscle; (3) reduplicated 
epineurium of thoracic nerves 
Submitter: D. Lightner 
RTLA 2557. South African clawed frog, Xenopus laevis 
Material: Two lungs, each with nodular growths 
Habitat: Netherlands, Utrecht: Hubrecht Laboratorium 
Diagnosis: Bacterial pneumonia 
Submitter: R. Verhoeff-de Fremery 
RTLA 2558. South African clawed frog, Xenopus laevis 
Material: Grossly enlarged spleen 
Habitat: Netherlands, Utrecht: Hubrecht Laboratorium 
Diagnosis: Splenomegaly — preservation inadequate for 
definitive diagnosis; bacteremia suspected 
Submitter: R. Verhoeff-de Fremery 
RTLA 2559. Flattened musk turtle, Stemotherus depressus 
Material: Excised piece of tissue from tumor-like protrusion 
extending from jaw 
Habitat: Alabama, Jasper: Walker County, Black Water Creek, 
branch of Mulberry 
Diagnosis: Multifocal bacterial granuloma 
Submitter: G. R. Zug 
RTLA 2560. Rainbow trout, Salmo gairdneri 
Material: Three tissue samples; 3 microslides 
Habitat: New Zealand: Lake Taupo 
Diagnosis: Myxoma 
Differential dx: mjrxoid degenerative change 
Submitter: N. C. Boustead 
RTLA 2561. Brown house snake, Boaedon fuliginosus 
Material: Whole animal with slightly enlarged liver and 
growth in the ovarian region 
Diagnosis: Highly pleomorphic, poorly-differentiated, malig¬ 
nant ovarian neoplasm of undetermined cell type 
Differential diagnoses include: liposarcoma; 
melanoma; highly anaplastic ovarian carcinoma 
Submitter: I. Gorman 
