X-linked reticulate pigmentary disorder (also known as "Familial cutaneous amyloidosis," "Partington amyloidosis," "Partington cutaneous amyloidosis," "Partington syndrome type II," "Reticulate pigmentary disorder", and "X-linked reticulate pigmentary disorder with systemic manifestations") is a cutaneous condition that has been described in adult women that had linear streaks of hyperpigmentation and in which male patients manifested a reticulated mottled brown pigmentation of the skin, which, on biopsy, demonstrated dermal deposits of amyloid.

The syndrome is also referred with the acronym X-Linked-PDR or even XLPRD.

It's a very rare disease, genetically determined, with a chronic course.

The gene responsible for the disease has not yet been identified. It is expected to be in the range of Xp21-Xp22.

It was characterized in 1981.

Presentation

Affected males develop generalized reticular hyper pigmentation in early childhood.
Hair often looks bedraggled or brushed backwards, hanging low on the forehead.

Among the associated extracutaneous manifestations are described:

• Respiratory infections
• Dyskeratosis corneal photophobia
• Hypohidrosis with large deficit of thermoregulation
• Growth retardation
• Gastrointestinal disorders
• Kidney disease
• Kidney stones
• Urinary infections
• Webbed feet or hands
• Electrolyte imbalance
• Retinitis pigmentosa
• Lymphoedema
• Thyroid abnormalities

Each patient shows some of the symptoms listed above. Not every sick person will show all of the listed symptoms.

In females the disease is characterized by skin rashes linear hyper pigmentation following the Blaschko's lines

Blaschko's lines

Blaschko's lines, also called the Lines of Blaschko, are skin lines invisible under normal conditions. They become apparent when some diseases of the skin or mucosa manifest themselves according to these patterns...

, morphologically similar to stage 3 pigment incontinence. There are no systemic manifestations associated with XLPDR in females.