Is there really no English equivalent to German's “Fachidiot”?

There was the following paragraph in the article that came under the title, “GOP and the rise of Anti-knowledge” written by Mike Lofgren in Consortiumnews.com (October 29, 2015):

“English unfortunately doesn’t have a precise word for the German “Fachidiot,” a narrowly specialized person accomplished in his own field but a blithering idiot outside it. In any case, a surgeon is basically a skilled auto mechanic who is not bothered by the sight of blood and palpitating organs. We need the surgeon’s skills on pain of agonizing death, and reward him commensurately but that does not make him a Voltaire.”

In Japanese we have a word, 専門バカ, of which literal translation is “specialist idiot” meaning exactly same as defined the above - a narrowly specialized person accomplished in his own field but a blithering idiot outside it.

I’m really curious about the absence of short descriptions of the specialist who knows nothing more than his specialty area in English like German “Fachidiot,” and Japanese "専門バカ."

Isn’t there really any short word counterpart to “Fachidiot,” specialist’s ignorance, for instance, in English?

P.S.

I found "narrow-minded specialisit" as a German-to-English translation of "fachidiot" in the web site, Interglot translation dictionary.

The German fachidiot does indeed fill a gap in the English lexicon, until today I might have described a highly qualified person with little to no social or practical skills as someone who could have Asperger's syndrome. People who have this condition may be very focussed and experts on one or two subjects, (source) they can become obsessed in a particular field, and seem to live in their own world.

Looking at the German Wikipedia article, my browser translated the following excerpt into comprehensible English, any emphasis is mine.

Fachidiot

As specialist idiot (especially in Austria and specialized trottel) a is an expert called that a problem only from the perspective of its subject area knows only from his point of view (narrow-mindedness can grasp) […]. Often the Fachidiot finds it difficult to empathize with others and to supplement its limited view and expand. Further possible ways of looking at it rejects due to selective perception (selfishness , narcissism) and consequent ignorance

The above description shares some similarities with Asperger's syndrome, but labelling a person is a risky affair, and should be avoided unless you are qualified to diagnose such a disorder. In alternative, may I suggest the following:

solipsist
2. extreme preoccupation with and indulgence of one's feelings, desires, etc.; egoistic self-absorption.

blinkered
1. narrow-minded and subjective; unwilling to understand another viewpoint.

monomaniac
2. an inordinate or obsessive zeal for or interest in a single thing, idea, subject, or the like.

However, none of the above really fit with the description of a fachidiot, a "subject fool", someone who knows everything about one discipline but nothing about anything else, the Independent article, written in 1998, goes on further to describe the late Margaret Thatcher:

Despite Oxford, the Bar, and her work as an industrial chemist (when she was partly responsible for the invention of Mr Whippy ice cream), she is a woman of painfully limited interests. [...] His [Dennis Thatcher] wife has no recreations or hobbies of any sort. She tried to interest herself in Chinese porcelain, but she remains a complete philistine, and notably ill-read. Her single- mindedness has been a strength, but it takes displeasing forms.

It appears that the German term draws attention to the narrow field of interests rather than the the person's incompetency or foolishness outside their specialized area of expertise. No one would ever say that the ex-British Prime Minister was an idiot, but many would agree that she was myopic, blinkered, and a solipsist.

Lastly, Dict.CC the German English Online Dictionary par excellence, offers the following translations for fachidiot

1. geek [esp. Am.] [coll.]
2. nerd [coll.] [obsessive expert in a specific industry]
3. blinkered expert [Br.]
4. one-track expert

Note, there is no mention of idiot, fool or dunce.

_{All definitions from Dictionary.com}

Idiot savant is probably the closest you are going to get in English:

Idiot savant: 1. <...> 2. a person who is highly knowledgeable about one subject but knows little about anything else

merriam-webster.com/dictionary/idiot+savant

PS: Since we bring ngram in the game... Idiot savant vs Learned fool

Just occurred to me that given the pejorative nature of the word, the best source for this usage would be Google News and indeed it seems "idiot savant" is used regularly in English news much the same way fachidiot is in German.

** The first definition is now blanked out because it appears some people are failing to notice the second definition.

I'd call that person a one trick pony

A person or group noteworthy for only a single achievement, skill, or characteristic.

Wiktionary

For example, "He may be an excellent welder but he's a one trick pony"