= Solution
\b[<Phlegmasia alba dolens>, the historical “white” or “milk” leg, is a painful, swollen limb associated with extensive <deep vein thrombosis>, particularly around childbirth. The modern priority is to identify <venous thrombosis> and prevent <pulmonary embolism>, not to treat an imagined accumulation of milk.]
Obstruction of major pelvic or thigh <veins> raises pressure in the channels draining the limb; fluid then accumulates in the tissues as <oedema>. Severe outflow obstruction can also impede lymphatic drainage. The pale, tense appearance accounts for “alba”. It differs from <phlegmasia cerulea dolens>, in which more complete obstruction, including collateral channels, produces a congested blue limb and can threaten arterial <perfusion>. A historical case description cannot automatically be assigned one modern diagnosis solely from its name.
The central causal mechanisms are slowed venous flow, injury to the vessel wall and increased tendency of the blood to clot. <Pregnancy> promotes <hypercoagulability> and pelvic venous compression; childbirth can add tissue injury, immobility and <infection>. Prior <venous thrombosis>, <thrombophilia>, prolonged immobility, operative delivery and severe systemic illness further increase risk. It is not confined to the puerperium or even to women. The serious consequences are extension of the <thrombus>, detachment into the <pulmonary arteries> as a <pulmonary embolism>, and chronic obstruction or valvular damage producing <post-thrombotic syndrome>.<Diagnosis and treatment of venous thrombosis in pregnancy and after birth by the Royal College of Obstetricians and Gynaecologists>[“Why is a DVT serious?” and risk factors before, during and after pregnancy]{ref}
An historically informed explanation should recognise that nineteenth-century arguments concerned the relative importance of venous obstruction, <phlebitis>, lymphatic disease and puerperal illness. Rest, support and elevation of the limb, pain relief and local soothing applications belonged to the period's conservative repertoire. These could ease symptoms but did not provide effective <anticoagulation>. Neither the “milk leg” name nor the observation of puerperal <infection> establishes that every case is caused by milk displacement or by infected clot. The thrombotic and infective questions must be distinguished.
Current management begins with clinical assessment and <compression ultrasonography>. A normally patent <vein> collapses under appropriate transducer pressure; a thrombosed segment often fails to compress. <Doppler ultrasonography> adds information about flow, and suspected pelvic disease may require further imaging. A negative initial study does not close a strongly suspicious case; repeat or additional imaging may be needed. Fever and systemic illness prompt assessment for <infection>, while breathlessness, chest pain or collapse require urgent assessment for <pulmonary embolism>.<Diagnosis and treatment of venous thrombosis in pregnancy and after birth by the Royal College of Obstetricians and Gynaecologists>[“How are DVT and PE diagnosed during pregnancy?”]{ref}
Unless contraindicated, therapeutic <low-molecular-weight heparin> is the usual treatment during <pregnancy>. It limits further clot formation while the body's own processes deal with the existing <thrombus>; it is not an instant mechanical solvent. Management also provides <analgesia>, elevation and appropriate mobilisation once stable, with fitted compression for symptoms when suitable. Prolonged compulsory bed rest is not a general modern remedy. A threatened limb or suspected massive <pulmonary embolism> needs immediate specialist escalation; routine <thrombolysis> for every swollen leg would expose patients to unjustified <haemorrhage>.
For confirmed pregnancy-associated <venous thromboembolism>, treatment usually continues through the rest of <pregnancy> and for at least six weeks after birth, with at least three months' treatment in total; the delivery plan must account for bleeding and <anaesthesia>. <Antibiotics> address a demonstrated or strongly suspected infective complication, not uncomplicated <venous thrombosis> itself.<Thrombosis and Embolism during Pregnancy and the Puerperium: Acute Management by the Royal College of Obstetricians and Gynaecologists>[Green-top Guideline 37b, sections 4–8 and 10: imaging, heparin, supportive measures, mobilisation and duration; 2015 guideline, still listed while an update is in development]{ref}
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