Summary
The clinical, ultrasonographic, arthrographic and histopathological aspects of a localized
histiocytic sarcoma in the tendon sheath of the biceps brachii muscle in a Flat-Coated
Retriever are described. An eight-year-old female Flat-Coated Retriever was referred
for evaluation of chronic forelimb lameness. The orthopaedic examination revealed
a painful shoulder joint. Ultrasonographic evaluation revealed distention of the tendon
sheath of the biceps brachii muscle and the presence of multiple, hyperechoic structures
in the distal portion of the sheath. The histological and immunohistochemical diagnosis
of a biopsy taken during surgical exploration of the shoulder joint was histiocytic
sarcoma. Palliative treatment with corticosteroids was administered but the dog was
euthanized at the owner’s request four months following diagnosis due to progressing
lameness. Post-mortem examination confirmed the diagnosis of histiocytic sarcoma without
any evidence of metastases.
Keywords
Localized histiocytic sarcoma - tendon sheath - FlatCoated Retriever