Shashi Aggarwal, M.D.;[unkeyable] N...

Shashi Aggarwal, M.D.;[unkeyable] Narender K Arora, M.D.;[unkeyable] Ragini Koyyana, M.B.B.S.;[Section] Sima Mukhopadhyay, M.D.;[unkeyable] and Alka Kumar, M.D.[unkeyable]

A 1 1/2-year-old girl neared with a four-month history of free from moisture paroxysmal cough associated with breathlessness. She had a history of low-grade agitation twice in the past four months; each episode lasted the same to two days. There was no other relevant history. She had received various antibiotics without benefit. forward examination, she was irritable and had tachypnea and mild cyanosis. There was mild intercostal recession. Chest auscultation revealed bilateral diffuse coarse crepitations. The quietness of the examination was normal.

Pertinent laboratory investigation results included a raised ESR and a WBC reckon of 12,500/cu mm with 10 percent eosinophils. A chest roentgenogram showed bilateral reticulonodular opacities, more marked in the right lung associated with a prominent right mediastinal bilge (Fig 1). A differential diagnosis of miliary tuberculosis, sarcoidosis, and histiocytosis X was considered. Since miliary tuberculosis is through far the most common in this subcontinent, the patient was given antituberculosis mix with drugs therapy along with steroids, equal though the Mantoux and BCG proofs were negative. However, the patient's condition continued to deteriorate, and the breathlessness and cyanosis were more pronounced undivided month later.

A CT scan performed at this time confirmed interstitial lung disease and also showed small pouchs (Fig 2); the solid mediastinal mass, localized to the anterior mediastinum, was of nonspecific morphology level after IV contrast enhancement (Fig 3) A skeletal measure and estimate was performed but results were normal. Other investigations, including bone marrow examination and liver biopsy, also did not provide a fastening to the diagnosis. A right thoracotomy was performed. At operation there was a hard, caseating mediastinal mass with the adjacent lung adherent to it. The right lung showed multiple small pouchs and extensive fibrosis, but the expansion was virtuous Both the mass and the lung were biopsied.

Diagnosis: Primary pulmonary histiocytosis X

The mediastinal biopsy showed large aggregates of lipid-laden histiocytes with a number of giant lonely dwellings lymphocytes, plasma cells, eosinophils, and occasional neutrophils. The surrounding tissue showed fibrosis. The lung biopsy revealed thickening of the alveolar septa with a large number of foamy and solid histiocytes.

Pulmonary involvement in histiocytosis X may flash on the mind as a part of the disseminated disease or as a separate entity, called primary pulmonary histiocytosis X (PPHX); the pair are indistinguishable pathologically.[1,2] Any distinction, therefore, must be based forward clinical and/or radiologic examination. The former is to a great degree more common in children, while PPHX is seen chiefly in young adult males.[1] barely 14 patients of PPHX have been reported in such a manner far in prepubertal children.[3,4] The prognosis of PPHX in the pediatric age collection is grave; seven patients had died within single in kind year of diagnosis.[3,4]

The typical radiologic features in adults include a reticulonodular infiltrate with or without honeycombing, occurring predominantly in the upper lobes;[2,3] pneumothorax can also present itself Sparing of the costophrenic angles reportedly carries a advantageous prognosis;[2] this was seen in our patient (Fig 1) Nonetheless, these features are nonspecific, and other causes of interstitial lung disease in children should be exclud like as sarcoidosis, Hamman-Rich syndrome, tuberous sclerosis, and the collagen diseases, although they are equally rare. An render free of access lung biopsy will establish the diagnosis if the clinical features are not distinctive.

Pulmonary involvement is the predominant moreover not necessarily sole site of involvement in PPHX An occasional patient may demonstrate extrapulmonary involvement in the form of diabetes insipidus[1] or minor skeletal lesions.[3] PPHX in association with an anterior mediastinal mass has not previously been reported. This combination is flat more unusual, because an anterior mediastinal mass itself is rare at the time of presentation in children with histiocytosis X[5] It is study that these masses represent thymic infiltration.[6] Certainly, the mass in our patient was at the site of the thymus and was inseparable from it upon CT (Fig 3).

Owing to the paucity of pediatric literature onward PPHX and to the well-known incident of spontaneous remissions in histiocytosis X a firm opinion forward the therapy of these patients is not possible. Our patient deteriorated after receiving steroids, which is at variance with the experience of others.[3] We subsequently treated her with 25 mg/day of mercaptopurine, following which she had a gratifying clinical response--the breathlessness and cyanosis gradually disappeared from one side of to the other six weeks. A plain roentgenogram four month after initiation of mercaptopurine therapy showed marked regression of the mediastinal mass, although the infiltrates persisted almost unchanged. It is known, however, that the radiologic findings may persist unchanged or equal progress despite remarkable clinical improvement.[4] Abramson et al[6] described cavitation occurring in the anterior mediastinal masses after therapy in children with histiocytosis X; this was not seen in our patient.