Myotonic dystrophy

Compare differential diagnoses

Differential diagnosis

Important

statMed.org is designed to help students of medicine to learn about differential diagnosis.

It is NOT a clinical decision support tool and should NOT be used to guide decisions about clinical practice.

The website should not be used by people who are not studying medicine. If you are not studying medicine please leave the website. statMed.org is for medical educational purposes only and it is not intended to constitute professional medical advice, diagnosis or treatment.

It is NOT a symptom checker.

If you are concerned about a medical problem you should immediately seek medical assistance from a doctor.

statMed.org and it's affiliates, officers and employees shall not be held liable in anyway responsible for any direct or indirect consquences resulting from the use of the website.

Differential diagnosis

Please enter at least one feature (symptom, sign or investigation result) before performing the calculation.

For example, if chest pain and low oxygen saturations were present, but haemoptysis was absent, the features section should look as follows:

To add a feature that is present, start typing and then click the green arrow.

To add the absence of a feature (i.e. a 'negative' finding), start typing then click the red cross.

If you want to remove a feature from the list simply click the grey cross in the box to the right of the feature.

statMed.org

Knowledge
Differential diagnosis
Contact
About

Myotonic dystrophy

Epidemiology

Clinical features

Myotonic dystrophy

Epidemiology

Incidence: 0.20 cases per 100,000 person-years
Peak incidence: 30-40 years
Sex ratio: 1:1





















<1	1-5	6+	16+	30+	40+	50+	60+	70+	80+

Clinical features

Symptoms

Ptosis (80%)
Leg weakness (unilateral) (60%)
Arm weakness (unilateral) (60%)

Signs

Proximal muscle weakness (30%): Muscle weakness tends to be distal initially