The Brazilian Navy has three hospital ships, officially called Infirmary Assistance Ship (Navio de Assistência Hospitalar, in Portuguese), which are designed specifically to provide medical assistance on rivers having shallow waters.
The two ships of the Oswaldo Cruz class have a helipad, two sickbays, an operating theater, a dental surgery, a laboratory, two clinics, and X-ray facilities.
Doutor Montenegro lacks the helipad and is smaller and slower.
[1] The main characteristics of the Oswaldo Cruz class are: