Computed tomographic and ultrasonographic diagnosis with successful excision of a lipoma in a shusui koi (Cyprinus carpio)

Abstract

CASE DESCRIPTION A client-owned 12-year-old 10.3-kg (22.7-lb) female shusui koi (Cyprinus carpio) was evaluated because of an ulcerated mass on the left body wall, hyporexia, and decreased activity. CLINICAL FINDINGS The patient was anesthetized with a solution of eugenol in water for all examinations and procedures. An approximately 7 × 5-cm smooth, raised, ulcerated, and firm mass was present ventral and lateral to the dorsal fin on the left body wall. Whole-body CT images obtained before and after contrast administration revealed an encapsulated, homogeneous, fat-opaque mass within the muscle. The mass was fat echoic with poor vascularity on ultrasonographic examination. Histologic evaluation of an ultrasound-guided needle biopsy specimen was suggestive of a lipoma. TREATMENT AND OUTCOME The mass was excised, and the fish was placed in water with 0.3% salinity for 3 weeks after surgery. Postoperative antimicrobial administration was not indicated, and additional postoperative analgesic administration was considered impractical. The patient had noticeable improvement in appetite and activity with no indication of discomfort immediately following surgery. Five weeks after surgery, the incision site had healed with minimal scarring, and evaluation of CT images revealed no evidence of mass regrowth or regional osteomyelitis. CLINICAL RELEVANCE Antemortem evaluation and diagnosis of a lipoma in a teleost with subsequent excision was described. This report highlighted the logistic challenges associated with anesthesia, advanced diagnostic imaging, and surgery in fish and showed that they can be successfully overcome so that high-level medical care can be provided to such patients.

Use of computed tomography and magnetic resonance imaging to assess a case of spinal injury in a Showa koiCyprinus carpio

“…Thus, it is an important consideration when presented with spinal trauma or other neurologic disorders in fish. Surgical interventions have been attempted to correct spinal deformities in koi and are increasingly being used successfully in the treatment of other conditions in fish (Govett et al 2004; Sladky and Clarke 2016; Kehoe et al 2020). Accordingly, it is imperative that diagnostics providing the best information for pre‐operative planning and prognostication are utilized.…”

Histological and Ultrastructural Description of Benign Adipocytic Tumors in Farmed Striped Sea Bream (Lythognathus mormyrus)

“…The term ‘’infiltrative lipoma’’, used in domestic animals and fish pathology, can be slightly misleading as it can be linked with the idea of a certain malignancy; in reality, infiltrative lipomas are considered to be benign as well, with no metastatic potential [ 8 ]. Lipomas and liposarcomas in fish can grow variably to enormous size (up to 20 kg [ 11 ]) and can result in cutaneous ulcerations [ 18 ] leading to complications such as secondary infections [ 21 ]. In our cases, epidermis have not been overtly affected, if we exclude a mild thickening in two cases.…”

“…To date, this classification has not been applied to fish. These type of tumors have been reported from a large variety of fish including carp bream Abramis brama (L.) [ 9 ], largemouth bass, Micropterus salmoides (Lacepede) [ 10 ], black crappie, Pomoxis nigromaculatus (Lesueur) [ 6 ], channel catfish, Ictalurus punctatus (Rafinesque) [ 11 ], European eel, Anguilla anguilla (L.) [ 12 ] striped mullet, Mugil cephalus (L.) [ 13 ], common dab, Limanda limanda (L.) [ 14 ], northern bluefin tuna, Thunnus thynnus (L.), where they appear particularly frequent [ 15 , 16 , 17 ], striped seabream, Lithognathus mormyrus [ 18 ], European seabass, Dicentrarchus labrax (L.), [ 19 ], molly, Poecilia velifera (Regan), [ 20 ], and koi carp, Cyprinus carpio [ 21 ]. Angiolipoma has been described in a Siamese fighting fish, Betta splendens [ 22 ], whereas liposarcomas have rarely been diagnosed in fish [ 7 ] but have been reported in Dragonet, Callionymus lyra [ 23 ] halibut, Hippoglossus hippoglossus [ 24 ], clownfish, Amphiprion ocellaris [ 25 ], and flower horn fish, a hybrid cichlid [ 26 ].…”