Evaluation of the validity of the double two-thirds rule for diagnosing hemangiosarcoma in dogs with nontraumatic hemoperitoneum due to a ruptured splenic mass: a systematic review.

Objective: To evaluate the validity of the double two-thirds rule for a diagnosis of splenic hemangiosarcoma in dogs with nontraumatic hemoperitoneum due to a ruptured splenic mass.

Sample: Systematic literature review.

Procedures: 3 databases (PubMed, CAB abstracts, and World of Science) were searched in November 2020.

Development and validation of a hemangiosarcoma likelihood prediction model in dogs presenting with spontaneous hemoabdomen: The HeLP score.

Objective: To calculate a risk prediction model for hemangiosarcoma (HSA) diagnosis in dogs presenting with nontraumatic hemoabdomen.

Design: Retrospective multicenter observational cohort study enrolling dogs presented 2003-2016.

Setting: Five academic veterinary medical centers.