An 8.5 yr old FS Scottish Terrier

Presented to a referral hospital on 8/1/25 for very extensive nonpainful pendulous ventral abdominal subcutaneous mass lesion.

An abdominal ultrasound showed multiple anechoic nodular lesions in her spleen and extensive hetero-echoic subcutaneous tissue extending from xiphoid to left ischium and perineum caudally and with an amorphous intra-abdominal mass in the left caudal peritoneal cavity. US guided FNAs from SC and intra-abdominal mass was cytologically consistent with lymph. An abdominal CT scan highlighted a highly vascular mass most consistent with a neoplasm of vascular origin involving SC ventral abdominal wall with ingrowth into the caudal abdominal cavity via the left inguinal ring.

An exploratory laparotomy was done on 12/1/25 and biopsies of the subcutaneous swelling and peritoneal mass and spleen were collected for histopathology and culture. Results confirmed lymphangiosarcoma in the subcutaneous and intra-abdominal mass samples and severe chronic splenic congestion and haemorrhage with EMH from the spleen. Tissue culture showed no growth aerobically and anaerobically.

Bonnie was referred to ONE on 23/1/25 to discuss radiation therapy. A CT simulation scan was done on 30/1/25 and SRT commenced on 3/2/25 and was completed 6/2/25.

Following SRT Bonnie developed a moderate enteritis which resolved after a few days of supportive care. A follow up CT scan was done on 1/7/25 which showed a marked reduction in the mass. A further recheck CT scan done on 13/1/26 showed an estimated 95% resolution of the mass effect. Currently Bonnie is doing very well clinically with no other concerns with last follow up at 26/3/26, approximately 14 months after completion of radiation therapy.