Skip to main page content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation
Case Reports
. 2008 Sep;49(9):871-6.

Magnetic resonance imaging in the diagnosis of type 1 dermoid sinus in two Rhodesian ridgeback dogs

Sheila Rahal  1 , Ana Carolina Mortari, Seizo Yamashita, Miltom Morishin Filho, Eduardo Hatschbac, Júlio Lopes Sequeira
Affiliations
Case Reports

Magnetic resonance imaging in the diagnosis of type 1 dermoid sinus in two Rhodesian ridgeback dogs

Sheila Rahal et al. Can Vet J. 2008 Sep.

Abstract
in English, French

Two cases of type 1 dermoid sinus in Rhodesian ridgebacks are described, with emphasis on the use of magnetic resonance imaging (MRI) in the diagnosis and delineation of the lesions. Magnetic resonance imaging was useful in identifying fluid-filled structures, fibrous capsules, and sinus tracts, but was not able to identify the termination of the tracts.

L’IRM dans le diagnostic du sinus dermoïde de type 1 chez 2 chiens Rhodesian ridgeback. Cette étude décrit 2 cas de sinus dermoïdes de type 1 chez des chiens Rhodesian ridgeback et met l’accent sur l’utilisation de l’imagerie par résonnance magnétique (IRM) dans le diagnostic et la localisation des lésions. L’IRM a été utile pour identifier les structures remplies de liquide, les capsules fibreuses et les voies sinusales mais n’a pas permis d’identifier la terminaison des voies.

(Traduit par Docteur André Blouin)

PubMed Disclaimer

Figures

Figure 1
Figure 1
Dermoid sinus in a 1-year-old Rhodesian ridgeback dog. A — Lesion on the dorsal aspect of the neck (arrow). B — Sagittal T-1 weighted magnetic resonance image (MRI) showing elliptical structure with intermediate signal in its lumen (arrow). C — Sagittal T-1 weighted MRI showing elliptical structure with intermediate signal and its tract with hypointense signal (arrow). The cervical spine (CS) is visible. D — Sagittal STIR image showing hyperintense signal of the elliptical structure (arrow) and its tract. The trachea (T) is shown in B, C, and D.
Figure 2
Figure 2
Dermoid sinus in a 1-year-old Rhodesian ridgeback dog. Transversal T-2 weighted magnetic resonance images showing rounded structure (arrow) with intermediate signal in its lumen (A,B), and its tract (white arrow) (B). Observe also the vertebrae (V) and spinal cord (S).
Figure 3
Figure 3
Dermoid sinus in a 1-year-old Rhodesian ridgeback dog. A — Sagittal T-1 weighted magnetic resonance image showing the cervical spine with no sign of involvement with the tract. Observe the spinal cord (S). B — Another sagittal T-1 weighted slice showing the elliptical structure (arrow). Observe the cervical spine (CS) and trachea (T).
Figure 4
Figure 4
A — Surgical removal of the dermoid sinus in a 1-year-old Rhodesian Ridgeback dog. Observe the cyst-like structures (arrows). B — Sinus tract extending ventrally between the dorsal cervical muscles. C — Longitudinal section of the excised tissue showing the sinus filled with sebaceous material mixed with hair. Observe the opening on the skin surface (arrow).
Figure 5
Figure 5
Dermoid sinus in a 5-month-old Rhodesian Ridgeback dog. A — The tract opening (arrow) on the dorsal cervical region, visible after clipping. B — Sagittal T-1 weighted magnetic resonance image of the cervical area showing a rounded structure with intermediate signal in its lumen suggesting fluid (arrow). C — Surgical removal of the sinus tract. D — Gross section of the excised sinus with hair in the lumen.
Figure 6
Figure 6
Photomicrograph of a section of the dermoid sinus showing a tubular structure (arrow) lined with internal epithelial layer (E) and filled with lamellar keratin (K), cellular debris, and hair (*) and sebaceous fluid. Hair follicles (F) and perivascular infiltrate (white arrow) were observed peripherally. Hematoxylin and eosin. Bar = 50 μm.
See this image and copyright information in PMC

References

    1. Lord LH, Cawley AJ, Gilray J. Mid-dorsal dermoid sinuses in Rhodesian Ridgeback dogs — A case report. J Am Vet Med Assoc. 1957;131:515–518. - PubMed
    1. Antin PI. Dermoid sinus in a Rhodesian Ridgeback dog. J Am Vet Med Assoc. 1970;157:961–962. - PubMed
    1. Leyh R, Carithens RW. Dermoid sinus in a Rhodesian Ridgeback. Iowa State Univ Vet. 1979;1:36–39.
    1. Gammie JS. Dermoid sinus removal in a Rhodesian Ridgeback dog. Can Vet J. 1986;27:250–251. - PMC - PubMed
    1. Marks SL, Harari J, Dernell WS. Dermoid sinus in a Rhodesian ridge-back. J Small Anim Pract. 1993;34:356–358.

Publication types

LinkOut - more resources