Page kidney or Page phenomena is a potentially reversible form of secondary arterial hypertension caused by external compression of the renal parenchyma by some perirenal process. Any process that causes mass effect can be a potential cause of Page kidney. Hematomas, urinomas, tumors, cysts, lymphoceles, and aneurysms have all been reported in the literature. The compression is believed to cause activation of the renin–angiotensin–aldosterone system (RAAS) via microvascular ischemia.Initially, the majority of cases that were described had a traumatic etiology but this has since shifted to iatrogenic causes. Since Page kidney is primarily a unilateral process, symptoms will differ depending on if the patient has native kidneys or not. In patients with only one solitary functioning kidney, the acute hypertension will also be accompanied by an acute decrease in renal function. In patients with one functioning kidney, prompt diagnosis and surgical treatment are needed to prevent irreversible kidney damage and restoration of kidney function. Medical treatment involves use of an angiotensin-converting enzyme inhibitor (ACEi) or an angiotensin receptor blocker (ARB) to control the hypertension. Signs & Symptoms
Since Page kidney is a unilateral process, symptom presentation differs significantly depending on if patients have native kidneys or only one functioning kidney, such as renal transplant recipients. In those with a normally functioning second kidney, the only symptom may be new-onset hypertension. However, this is in contrast to patients with just one functioning kidney. These patients will show signs of worsening renal function and decreased urine output in addition to hypertension.
Lichen scrofulosorum  is a rare tuberculid that presents as a lichenoid eruption of minute papules in children and adolescents with tuberculosis. The lesions are usually asymptomatic, closely grouped, skin-colored to reddish-brown papules, often perifollicular and are mainly found on the abdomen, chest, back, and proximal parts of the limbs. The eruption is usually associated with a strongly positive tuberculin reaction. Of the three tuberculids, the incidence of lichen scrofulosorum was found to be the lowest (2%) in a large study conducted in Hong Kong. This highlights its rarity and significance as an important marker of undetected tuberculosis. See also
Tuberculid
List of cutaneous conditions

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