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5. HEADACHE ATTRIBUTED TO HEAD AND/OR NECK TRAUMA 6. HEADACHE ATTRIBUTED TO CRANIAL OR CERVICAL VASCULAR DISORDER 7. HEADACHE ATTRIBUTED TO NON-VASCULAR INTRACRANIAL DISORDER 7.1. Headache attributed to high cerebrospinal fluid pressure 7.2. Headache attributed to low cerebrospinal fluid pressure7.3. Headache attributed to non-infectious inflammatory disease7.3.1. Headache attributed to neurosarcoidosis [D86.8] 7.3.2. Headache attributed to aseptic (non-infectious) meningitis 7.3.3. Headache attributed to other non-infectious inflammatory disease 7.3.4. Headache attributed to lymphocytic hypophysitis [E23.6] 7.4. Headache attributed to intracranial neoplasm [C00-D48]7.5. Headache attributed to intrathecal injection [G97.8] 7.6. Headache attributed to epileptic seizure [G40.x or G41.x to specify seizure type] 7.7. Headache attributed to Chiari malformation type I (CM1) [Q07.0] 7.8. Syndrome of transient Headache and Neurological Deficits with cerebrospinal fluid Lymphocytosis (HaNDL) 7.9. Headache attributed to other non-vascular intracranial disorder Bibliography and references8. HEADACHE ATTRIBUTED TO A SUBSTANCE OR ITS WITHDRAWAL 9. HEADACHE ATTRIBUTED TO INFECTION 10. HEADACHE ATTRIBUTED TO DISORDER OF HOMOEOSTASIS 11. HEADACHE OR FACIAL PAIN ATTRIBUTED TO DISORDER OF CRANIUM, NECK, EYES, EARS, NOSE, SINUSES, TEETH, MOUTH OR OTHER FACIAL OR CRANIAL STRUCTURES 12. HEADACHE ATTRIBUTED TO PSYCHIATRIC DISORDER 

IHS	Diagnosis	ICD-10
7.3.4	Headache attributed to lymphocytic hypophysitis [E23.6]	G44.82

Diagnostic criteria:

Headache, no typical characteristics known, fulfilling criterion C
Hypopituitarism fulfilling the following criteria:
1. MRI demonstrates symmetrical pituitary enlargement with homogeneous contrast-enhancement
2. biopsy confirmation of lymphocytic hypophysitis
Headache develops in close temporal relation to hypopituitarism

Comments:

Lymphocytic hypophysitis is often accompanied by hyperprolactinaemia (50% of cases) or autoantibodies against hypophyseal cytosol protein (20%).

This disorder typically develops at the end of pregnancy or during the post-partum period, but it can occur in men.

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IHS vs. ICD-10

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