Cagney & Lacey (1982)

Season 4: Episode 16

A two parter where Mary Beth discovers that she has a lump in her breast, but she refuses to talk about it or do anything about it. Chris finds out when Harvey gets worried and sneaks out to tell her. Chris finally convinces Mary Beth to see a doctor and then to get a second opinion. Meanwhile the detectives must find a missing child. Cagney thinks the kid ran away because the mother was unfit. The mother thinks that they would look harder for a white child. Finally he turns up in an underground passage and Chris goes in after him. Mary Beth goes in for her surgery, but Chris can't be there because she is taking the sergeant's exam. But she gets back in time to learn that the operation is a success