Journal

of

Wildlife

RENAL J.

BROWN,

Lcboratory,

SDall!e,

W.

kidney.

CASE

Florida

SMITH,

Research

California

94625,

C. KEYES,

January,

Mammal

98115,

Pribilof

THE

Pathology

32512, Animal

A 2-week-old in the

IN

23

1975

NORTHERN

Department,

FUR

Naval

SEAL

Aerospace

Medical

Research

USA* Division,

Naval

Biomedical

Research

Laboratory,

USA

Marine

Washington

Abstract:

dead

11,

Comparative

Pensaco!a,

Oak!and, MARK

Vol.

FIBROSARCOMA

RICHARD

ALVIN

Diseases

Division,

northern Islands

Histopathological

National

Marine

Fisheries

Service,

USA.

had

fur an

seal

female

irregular

examination

revealed

(Callorhinus

at the

found

ursinus)

anterior

pole

of the

right

a fibrosarcoma.

cut

REPORT

pup

mass

after

routine

paraffin

formalin

embedding

fixation

revealed

and

a

highly

Diseases of marine mammals, including neoplasia, have not been extensively studied. There are only a few reports of neoplasms in seals.”2”

cellular mass with islands ing the kidney parenchyma cells were for the most shaped and arranged in

This report is concerned with fibrosarcoma found at the anterior pole of the right kidney of a 2-week-old female northern fur seal. This animal was one of 35 northern fur seal neonates found dead on the breeding and parturition grounds of the Pribilof Islands in the summer of 1973. These islands are located approximately 320 km north of the Aleutian chain in the Bering sea, 1130 km west of Anchorage, Alaska.

and rosettes (Fig. 2). Pre-existing kidney tubules were surrounded by spindie cells which were arranged in a concentric pattern. Hyperchromatic nuclei and mitotic figures were abundant in some areas but sparse in others.

RESULTS

Gross examination revealed an irregular nodular mass at the anterior end of the kidney. The tumor did not protrude nor extend to a noticeable degree above the contour of the kidney. On cut section the mass was grayish white and measured 0.8cm x 0.4cm. No other lesions were found in the animal. Microscopic

*

Present APO

examination

address: San

Francisco

Pathology 96263,

of

Department, USA.

sections

DISCU3SEON

The

pattern

of

suggestive

of

However viewing whorls

this was a reticulum and bundles

blasts

feel

and

this

the

a

cells

was

discounted after restain. Based on the of immature fibro-

numerous

tumor

spindle

hemangiopericytoma.

mitotic

represents

figures,

a renal

we

fibro-

sarcoma.

The fibrosarcoma found in the urogenital dog, mare and ox.’ The authors vious reports kidney

U.S.

of cells invad(Fig. 1). The part spindlewhorls, eddies

Naval

of

Medical

are of

marine

Research

a

is

occasionally system of the

unable to fibrosarcoma

find in

prethe

Box

14,

animals.

Unit

No,

2,

24

FIGURE

FIGURE northern

Journal

1.

2. fur

Islands

of

neoplastic

Rosettes

(arrows)

seal,

H & E 250X.

are

cells

seen

invading

among

of

the

spindle

Wildlife

renal

cells

Diseases

parenchyma,

with

Vol.

fur

hyperchromatic

11,

seal,

January,

H

nuclei,

&

1975

E 40X.

kidney,

Journal

of

Wildlife

LITERATURE

CITED

1.

GRINER,

Diseases

L. A.

geronimensis).

2. 3. 4.

Vol.

11,

1971. Malignant Am. J. vet.

MAWDESLEY-THOMAS, seal (Miraunga

leonina).

MAWDESLEY-THOMAS, in a gray seal

(Halichoerus

MOULTON, Berkeley,

J. E. pp.

January,

leukemia Res. 32:

and grypus).

Tumors

in

W.

in two 827-830.

harbor

ovarian tumor 8: 9-15. N. BONNER. J. Pathol. 103:

Domnestic

Animals.

26-27. Received

for

publication

25

-

L. E. 1971. An Vet. Pathol. L. E.

1961.

1975

26

March

1974

seals

(Phoca

in a southern 1971. Uterine 205-208. Univ.

of

Calif.

vitulina

elephant tumors Press,