A top transgender surgeon is being sued by two patients who claim their operations left them with deformed genitals.

Two anonymous transgender men have filed separate lawsuits against Dr. Curtis Cetrulo over their 'botched' phalloplasties at Massachusetts General Hospital (MGH) in Boston.

Cetrulo, a renowned plastic surgeon who performed the first successful penis transplant in the United States in 2016, worked at MGH's Transgender Health Program.

The lawsuits claim that Cetrulo's 'delayed abdominal phalloplasty' operations on both patients were 'untested and experimental' procedures that resulted in severe complications.

According to the court filings, a delayed abdominal phalloplasty is a staged procedure that uses skin from the abdomen to construct a penis.